研究者詳細 - 伊藤　孝至

論文 - 伊藤　孝至

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Fabrication of Tilted Mg₂Si/Ni Multilayer Composite Modules Utilizing Polylactic Acid Resin Molds and Evaluation of The Thermoelectric Power Generation Performance 査読有り

Tomohiro KUSUMOTO, Yasuyoshi KUROKAWA, Noritaka USAMI, Takashi ITOH

J. Jpn. Soc. Powder Powder Metallurgy 72 巻 ( Supplement ) 頁： S1269 - S1273 2025年3月

Thermoelectric properties of Mg₂Si thin films prepared by thermal evaporation of Mg and face-to-face annealing 査読有り

Kurokawa, Y; Sato, K; Shibata, K; Kato, S; Miyamoto, S; Gotoh, K; Itoh, T; Usami, N

MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING 163 巻頁： 107552 2023年8月

Performance enhancement of droplet-based electricity generator using a CYTOP intermediate layer 査読有り

Wang, HT; Kurokawa, Y; Gotoh, K; Kato, S; Yamada, S; Itoh, T; Usami, N

JAPANESE JOURNAL OF APPLIED PHYSICS 62 巻 ( SC ) 頁： 1 - 6 2023年4月

Morphology and Thermoelectric Properties of Mg_3+δSb₂ Foams Manufactured Using Combustion Synthesis 査読有り

Koga Takashi, Itoh Takashi

MATERIALS TRANSACTIONS 64 巻 ( 4 ) 頁： 835 - 840 2023年4月

Improved conversion efficiency of p-type BaSi₂/n-type crystalline Si heterojunction solar cells by a low growth rate deposition of BaSi₂ 査読有り

Michinobu Fujiwara, Kazuma Takahashi, Yoshihiko Nakagawa, Kazuhiro Gotoh, Takashi Itoh, Yasuyoshi Kurokawa, Noritaka Usami

AIP Advances 12 巻 ( 4 ) 頁： 045115 2022年4月

Fabrication of heterojunction crystalline Si solar cells with BaSi2 thin films prepared by a two-step evaporation method 査読有り

Nakagawa, Y; Takahashi, K; Fujiwara, M; Hara, KO; Gotoh, K; Kurokawa, Y; Itoh, T; Suemasu, T; Usami, N

JAPANESE JOURNAL OF APPLIED PHYSICS 60 巻 ( 10 ) 頁： 105503-1 - 105503-6 2021年10月

燃焼合成を利用して作製したMg_3+δSb₂発泡体の形態と熱電特性査読有り

古賀誉史, 伊藤孝至

粉体および粉末冶金 68 巻 ( 9 ) 頁： 399 - 404 2021年9月

車載用熱電発電材料開発の動向招待有り査読有り

伊藤孝至

システム／制御／情報 65 巻 ( 6 ) 頁： 201 - 206 2021年6月

Quantitative Analysis on Influence of Structural Conditions on Thermoelectric Properties of Tilted Rod-Ni/Mg2Si Composites Based on Finite Element Simulation 査読有り

Itoh, T

MATERIALS TRANSACTIONS 62 巻 ( 2 ) 頁： 246 - 251 2021年

Synthesis of Mg2Si thin film by thermal treatment under inert gas atmosphere and evaluation of film quality 査読有り

Horiba, I; Fujiwara, M; Nakagawa, Y; Gotoh, K; Kurokawa, Y; Itoh, T; Usami, N

JAPANESE JOURNAL OF APPLIED PHYSICS 59 巻頁： SFFB03-1 - SFFB03-5 2020年4月

Optimization of Degreasing-Sintering Process for Mg2Si/PLA Mixture and Influences of Additive Amount of Al on Sintered Density and Thermoelectric Performance of Mg2Si Fabricated by the Optimized Process 査読有り

Itoh, T; Nakano, T

MRS ADVANCES 5 巻 ( 10 ) 頁： 459 - 467 2020年

横方向熱電効果を有する Ni/Mg₂Si複合材料の熱電特性に関する有限要素シミュレーション解析査読有り

伊藤孝至

粉体および粉末冶金 66 巻 ( 2 ) 頁： 80-88 2019年2月

有限要素シミュレーションに基づく傾斜棒状Ni/Mg₂Si複合材料の熱電特性に及ぼす構造条件の影響に関する定量解析査読有り

伊藤孝至

粉体および粉末冶金 65 巻 ( 11 ) 頁： 713-718 2018年11月

Finite Element Simulation on Thermoelectric Performance of Tilted Mg₂Si/Ni Multilayer Composites 査読有り

Takashi Itoh

J. Jpn Soc. Powder and Powder Metallurgy 65 巻 ( 3 ) 頁： 154-157 2018年3月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

Mg₂Si is a promising n-type thermoelectric (TE) material for TE power generation using waste heat with temperature range of 300 to 600^oC. Construction of multilayer composites with Mg₂Si and metallic material brings anisotropy in TE properties and enhancement in mechanical properties. The transverse TE force is created by giving vertical temperature difference in the tilted anisotropic TE material (transverse TE effect). In this study, the tilted Mg₂Si/Ni multilayer composites were focused on, and the influences of the structural conditions on the TE performance were investigated using a finite element simulation (FES). The simulations were carried out using two types of element models of the multilayer composites with different thickness ratio and tilt angle of Mg₂Si layer under the same temperature conditions of 500^oC (hot side) and 100^oC (cold side). The output power of the multilayer composites as a TE performance was calculated from the open-circuit voltage and the internal resistance estimated using FES. The values changed with the thickness ratio and the tilt angle. The optimum structural conditions of thickness ratio and the tilt angle which maximized the output power of the tilted multilayer composites were found out.

DOI： 10.2497/jjspm.65.154

有限要素シミュレーションを用いたMg₂Si/Ni傾斜積層複合材料の熱電特性および性能の解析査読有り

伊藤孝至

粉体および粉末冶金 64 巻 ( 9 ) 頁： 501-509 2017年9月

Influence of Pulverization and CaO Nanoparticles Addition on Thermoelectric Properties and Grain Growth of Mg₂Si Based Compound 査読有り

Takashi Itoh, Akira Tominaga

Materials Transactions 57 巻 ( 7 ) 頁： 1088-1093 2016年7月

Cobalt and Iron Doping Effects on Thermoelectric Properties of Higher Manganese Silicides Prepared by Mechanical Milling and Pulse Discharge Sintering 査読有り

Takashi Itoh, Shinya Uebayashi

J. Jpn Soc. Powder and Powder Metallurgy 63 巻 ( 7 ) 頁： 491-496 2016年7月

Thermoelectric Properties of Al-doped Mg₂Si Compounds Prepared via Three Kinds of Process for Grain Refinement 査読有り

Takashi Itoh, Akira Tominaga

MRS Advances 1 巻 ( Issue 60 ) 頁： 3989 - 3995 2016年5月

Thermoelectric Properties of Crystal Aligned Higher Manganese Silicide Fabricated by Solidification under Magnetic Field 査読有り

Kazushige Yamauchi, Takeshi Hagio, Tomoya Mitsuo, Kazuhiko Iwai, Takashi Itoh

Japanese Journal of Applied Physics 54 巻 ( 11 ) 頁： 117102-1-6 2015年10月

記述言語：英語掲載種別：研究論文（学術雑誌）

MnSi_1.73 is a promising p-type thermoelectric material for use in the intermediate-temperature region owing to its high oxidation resistance. Its thermoelectric properties are highly dependent on crystallographic direction and control of crystal alignment is thus important for polycrystalline MnSi_1.73. On the other hand, solidification under magnetic fields has been reported to directly yield crystal aligned structures in various alloys. Here, a 3T magnetic field was imposed during solidification of MnSi_1.73 for the first time. X-ray diffraction analysis indicated that polycrystalline MnSi_1.73 with c-axes aligned perpendicularly to the magnetic field was successfully obtained. The Seebeck coefficient slightly decreased while the electrical conductivity increased more than twofold along the magnetic field direction compared with those of the sample solidified without the magnetic field, which reflected the trend of a single crystal. The power factor reached a maximum of 2.09×10^-4 W m^-1K^-2 at 771 K; however, this was about one-fifth of that of a single crystal. Improvement in electrical conductivity by prevention of crack formation shall realize high performance expected from the crystal aligned structure.

DOI： 10.7567/JJAP.54.117102

Mg₂Si系化合物の熱電特性と粒成長に及ぼす粉砕とCaOナノ粒子添加の影響査読有り

伊藤孝至, 富永　彰

粉体および粉末冶金 62 巻 ( 3 ) 頁： 114-119 2015年3月

粉末冶金プロセスを用いた環境調和型シリサイド系熱電変換材料の開発招待有り査読有り

伊藤孝至

粉体および粉末冶金 61 巻 ( 11 ) 頁： 514-520 2014年11月

Design of Segmented Thermoelectric Generator Based on Cost-effective and Light-weight Thermoelectric Alloys 査読有り

Hee Seok Kim, Keiko Kikuchi, Takashi Itoh, Tsutomu Iida, Minoru Taya

Materials Science and Engineering B 185 巻頁： 45-52 2014年7月

記述言語：英語掲載種別：研究論文（学術雑誌）

A segmented thermoelectric (TE) generator was designed with higher temperature segments composed of n-type Mg₂Si and p-type higher manganese silicide (HMS) and lower temperature segments composed of n- and p-type Bi-Te based compounds. Since magnesium and silicon based TE alloys have low densities, they produce a TE module with a high specific power density that is suitable for airborne applications. A two-pair segmented π-shaped TE generator was assembled with low contact resistance materials across bonding interfaces. The peak specific power density of this generator was measured at 42.9 W/kg under a 498 ^oC temperature difference, which has a good agreement with analytical predictions.

DOI： 10.1016/j.mseb.2014.02.005

液相‐固相反応法とパルス放電焼結法を用いて作製したMg₂Siの焼結性と熱電特性に及ぼすAl添加の影響査読有り

伊藤孝至, 富永　彰

粉体および粉末冶金 61 巻 ( 6 ) 頁： 324-328 2014年6月

Influence of Aluminum Addition on Thermoelectric Performance of Mg₂Si Compound under Air Exposure with Temperature Difference 査読有り

T. Itoh, A. Tominaga

Mater. Res. Soc. Symp. Proc. 1642 巻頁： Online mrsf13-1642-bb03-11 2014年5月

Design of Linear Shaped Thermoelectric Generator and Self-integration Using Shape Memory Alloy 査読有り

Hee Seok Kim, Takashi Itoh, Tsutomu Iida, Minoru Taya, Keiko Kikuchi

Materials Science and Engineering B 183 巻頁： 61-68 2014年4月

半導体機器用Cr-Cu材ヒートシンクの焼結条件と溶浸性の関係査読有り

寺尾星明, 小日置英明, 太田裕樹, 伊藤孝至, 金武直幸

粉体および粉末冶金 60 巻 ( 8 ) 頁： 367-372 2013年8月

液相－固相反応法で合成したMg₂Si系化合物の焼結性と熱電特性に及ぼすMg仕込量とB添加量の影響査読有り

富永　彰,　伊藤孝至

粉体および粉末冶金 60 巻 ( 8 ) 頁： 354-359 2013年8月

Influence of Addition of Alumina Nanoparticles on Thermoelectric Properties of Higher Manganese Silicide 査読有り

T. Itoh, N. Ono

Mater. Res. Soc. Symp. Proc. 1490 巻頁： Online mrsf12-1490-b09-31 2013年1月

Influence of Addition of Alumina Nanoparticles on Thermoelectric Properties of La-filled Skutterudite CoSb₃ Compounds 査読有り

T. Itoh, M. Matsuhara

Materials Transactions 53 巻 ( 10 ) 頁： 1801-1805 2012年10月

Development of Cr-Cu Heat-sink(J-C'CREP®) for Semiconductor Device 査読有り

H. Terao, H. Kobiki, H. Ota, K. Tanabe, T. Itoh, N. Kanetake

Proc. 2012 Powder Metallurgy World Congress & Exhibition (PM2012) 頁： CD-ROM 16F-T14-13 2012年10月

Development of Eco-Friendly Thermoelectric Silicide Compounds and Modules for Energy Harvesting 査読有り

T. Itoh, K. Nishigata

Proc. 2012 Powder Metallurgy World Congress & Exhibition (PM2012) 頁： CD-ROM 16E-S1-15 2012年10月

Effects of Heavy Element Substitution on Electric Structure and Lattice Thermal Conductivity of Fe₂VAl Thermoelectric Material 査読有り

Y. Terazawa, M. Mikami, T. Itoh, T. Takeuchi

J. Electronic Materials 41 巻 ( 6 ) 頁： 1348-1353 2012年6月

Thermoelectric Properties of Mg₂Si-Based Compounds Synthesized Partially Using Magnesium Alloy 査読有り

T. Itoh, K. Hagio

AIP Conf. Proc. 1449 巻頁： 207-210 2012年6月

記述言語：英語掲載種別：研究論文（学術雑誌）

Mg₂Si compounds are promising eco-friendly thermoelectric materials because both constituent elements of Mg and Si have no toxicity and exist richly in earth crust. We have a plan to use the compounds in the applications that convert waste heat in the temperature range (600-900 K) into electric power. However, the thermoelectric performance of the compounds has not yet reached to the practical use level. In addition, the compounds don't have durability in the thermoelectric performance under atmospheric circumstances in the temperature range of 750-900 K. These issues have to be solved for the practical use. In our previous work, we obtained knowledge that Al doping in Mg₂Si lower the electrical resistivity and improved the thermoelectric performance. We newly attempted to use a magnesium alloy (AZ61) that includes the main three elements of aluminum (5.8-7.2 wt%), zinc (0.4-1.5 wt%) and manganese (0.15-0.35 wt%) in order to synthesize the Mg₂Si-based compounds. The Mg₂Si-based compound powders were synthesized from the mixture of silicon powder, AZ61 chips and Mg powder by the liquid-solid phase reaction method. The compound powders were sintered by the pulse discharge sintering method. The influence of mixing ratio of two metals of AZ61 and pure Mg on the thermoelectric properties was investigated. Addition of AZ61 greatly decreased the electrical resistivity as well as Al-doped Mg₂Si and the thermoelectric performance had improved most in the 50wt%AZ61 sample.

DOI： 10.1063/1.4731533

粉砕とパルス放電焼結を組合わせた方法による高マンガンシリサイドの合成とその熱電特性

伊藤孝至

日本熱電会誌 8 巻 ( 3 ) 頁： 18-21 2012年3月

Fe₂VAlの電子構造と熱電物性における重元素部分置換効果査読有り

寺澤祐一，三上祐史，伊藤孝至，竹内恒博

日本金属学会誌 76 巻 ( 3 ) 頁： 216-221 2012年3月

Solidification of MnSi_1.73 in A Magnetic Field 査読有り

T. Mitsuo, K. Iwai, T. Itoh

Proc. International Symposium on EcoTopia Science 2011 頁： 43 2011年12月

Development of Thermal Rectifier Using Unusual Electron Thermal Conductivity 査読有り

R. Nakayama, T. Itoh, T. Takeuchi

Proc. International Symposium on EcoTopia Science 2011 頁： 173 2011年12月

Synthesis of Ti-doped Higher Manganese Silicide by Pulse Discharge Sintering 査読有り

N. Ono, T. Itoh

Proc. International Symposium on EcoTopia Science 2011 頁： 236 2011年12月

Thermoelectric Properties of Mg₂Si-Based Compounds Synthesized Using Three Kinds of Magnesium Alloy 査読有り

K. Hagio, T. Itoh

Proc. International Symposium on EcoTopia Science 2011 頁： 235 2011年12月

Effect of Filling of Mg and Addition of Alumina Nanoparticles on Thermoelectric Properties of N-type La Filled CoSb₃ Compounds 査読有り

M. Matsuhara, T. Itoh

Proc. International Symposium on EcoTopia Science 2011 頁： 237 2011年12月

Synthesis of β-Zn₄Sb₃ Thermoelectric Nanoparticles by Reaction of Synthesized Sb Nanoparticles and Molten Zn 査読有り

T. Maruyama, T. Itoh

Proc. International Symposium on EcoTopia Science 2011 頁： 234 2011年12月

Synthesis of Higher Manganese Silicide and It's Thermoelectric Property 査読有り

N. Ono, T. Itoh

Proc. International Symposium on Materials Science and Innovation for Sustainable Society 2 巻頁： 11-12 2011年11月

Thermoelectric Properties and Durability of Mg₂Si-Based Compounds Synthesized Using Magnesium Alloy 査読有り

K. Hagio, T. Itoh

Proc. International Symposium on Materials Science and Innovation for Sustainable Society 2 巻頁： 13-14 2011年11月

Thermoelectric Properties of n-type La-Mg Double Filled CoSb₃ Compounds Synthesized by MA-PDS 査読有り

T. Maruyama, T. Itoh

Proc. International Symposium on Materials Science and Innovation for Sustainable Society 2 巻頁： 15-16 2011年11月

Thermoelectric Properties of Mg₂Si-based Compounds Synthesized Partially Using Magnesium Alloy 査読有り

T. Itoh, K. Hagio

Proc. 9th European Conference on Thermoelectrics 頁： CD-ROM B_39_P 2011年9月

Development of Thermal Rectifier Usable at High Temperature 査読有り

T. Takeuchi, H. Goto, Y. Toyama, T. Itoh, M. Mikami

J. Electronic Materials 40 巻 ( 5 ) 頁： 1129-1135 2011年5月

Thermoelectric Properties of Carbon Nanotubes Added n-type CoSb₃ Compound 査読有り

T. Itoh, M. Tachikawa

Mater. Res. Soc. Symp. Proc. 1314 巻 2011年5月

Synthesis of Bi₂Te₃ Nanosheets using Polyol Process 査読有り

S. Nishiwaki, T. Itoh

IOP Conference Series: Materials Science and Engineering 18 巻 2011年1月

Thermoelectric Properties of Carbon Nanotubes Added n-type CoSb₃ Compound

T. Itoh and M. Tachikawa

2010 MRS Fall Meeting Abstracts 頁： CD-ROM ID:911936 2010年12月

Fabrication and Thermoelectric Properties of Eco-Friendly Silicides for Thermoelectric Power Generation Using Waste Heat 査読有り

T. Itoh

Transactions of JWRI 39 巻 ( 2 ) 頁： 276-278 2010年12月

Synthesis of Bi₂Te₃ Nanosheets Using Polyol Process 査読有り

S. Nishiwaki and T. Itoh

3rd International Congress on Ceramics Abstracts 頁： CD-ROM, S9C-P019 2010年11月

Fabrication and Thermoelectric Properties of Eco-Friendly Silicides for Thermoelectric Power Generation Using Waste Heat 査読有り

T. Itoh

The International Symposium on Advanced Materials Development and Integration of Novel Structured Metallic and Inorganic Materials Proc. 頁： 283-284 2010年11月

Effect of Silicon Content on Thermoelectric Properties of Higher Manganese Silicide Compounds Prepared by Mechanical Grinding and Pulse Discharge Sintering

T. Itoh and M. Yoshikura

29th International Conference on Thermoelectric Abstracts 頁： 165 2010年6月

Synthesis of Thermoelectric Bi-Sb Alloy by Liquid-Solid Phase Reaction Method 査読有り

S. Nishiwaki and T. Itoh

29th International Conference on Thermoelectric Abstracts 頁： 191 2010年6月

ＭＧ－ＰＤＳ法で合成した高マンガンシリサイド化合物の熱電特性査読有り

吉倉雅晶，伊藤孝至

粉体および粉末冶金 57 巻 ( 4 ) 頁： 242-246 2010年4月

修正ポリオールプロセスによる熱電Bi-Sb合金のナノ粒子合成査読有り

田中裕介,　伊藤孝至

粉体および粉末冶金 57 巻 ( 4 ) 頁： 252-256 2010年4月

パルス放電焼結法によって作製したn型CoSb₃化合物の熱電特性に及ぼすアルミナナノ粒子添加の影響査読有り

太刀川雅史，伊藤孝至

高温学会誌 36 巻 ( 2 ) 頁： 85-89 2010年3月

Development of Materials and Modules for Thermoelectric Power Generation Recovering Waste Heat 招待有り

T. Itoh

Abstracts of The 15th ATA Symposium (International Green Energy Conference) 頁： L-06 2009年11月

担当区分：筆頭著者記述言語：英語

The waste heat with intermediate temperature (300-600 oC) is discharged from many kinds of combustion systems, and the thermoelectric power generation is the most effective means for its recovery. Thus, the developments of the thermoelectric materials and modules working effectively in this temperature range are required. We developed the thermoelectric materials and modules for the thermoelectric power generation recovering the waste heat

Syntheses of Ni-doped and Fe-doped CoSb₃ Thermoelectric Nanoparticles through Modified Polyol Process 査読有り

T. Itoh and K. Isogai

Mater. Res. Soc. Symp. Proc. 1166 巻頁： 135-140 2009年11月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

Skutterudite CoSb₃ compounds are of increasing interest as materials with good thermoelectric performance over the temperature range of 600 to 800 K, but the thermal conductivity of the materials is relatively high. Nanostructured materials have been shown to enhance phonon scattering and lower the thermal conductivity of the thermoelectric materials. Partial substitution of Ni or Fe on the Co site of CoSb₃ is a hopeful route for improving thermoelectric performance of the CoSb₃ compounds. In the present work, synthesis of Ni-doped and Fe-doped CoSb₃ nanoparticles through the modified polyol process was attempted and the optimum synthesizing condition was investigated. Co(OOCH₃)₂·4H₂O, Ni(OOCH₃)₂·4H₂O, FeCl₃·6H₂O and SbCl₃, were prepared as precursors. The precursors were reduced by NaBH₄ in tetraethyleneglycol at 513 K in an argon atmosphere, for different reaction times (holding times). The reaction products were characterized by the X-ray diffraction, the energy dispersive X-ray spectroscopy, and transmission electron microscopy. The nanoparticles with about 20 to 30 nm in size mainly existed in the reaction products regardless of the chemical composition and the reaction time. The skutterudite phase was identified as a main phase in the sample synthesized for long reaction time, but the other phases of Sb and MSb₂ (M=Co, Ni, Fe) were also detected. The lattice parameter of the synthesized skutterudite phase linearly increased with increasing the doping agent concentration, following Vegard's law.

Synthesis of thermoelectric Bi-Sb alloy nanoparticles 査読有り

Y. Tanaka, T. Itoh

Abstracts of R'09 Twin World Congress 頁： 78 2009年10月

記述言語：英語

Binary Bi-Sb alloy is a material with an excellent thermoelectric performance in the low temperature region below 0 oC. It is a hopeful candidate material for thermoelectric power conversion using cold heat resource. Bi-Sb alloy is a complete solid solution. However, its synthesis is difficult in the fusion method due to gravity segregation, and its single crystal is very brittle. No segregation, high mechanical strength and low thermal conductivity are required for the thermoelectric Bi-Sb alloy. These properties can be achieved by making up a polycrystalline body from nanosized Bi-Sb alloy particles. In this study, we attempted to synthesize the nanoparticles of thermoelectric Bi-Sb alloy through a modified polyol process. Two kinds of materials, Bi( NO3)3.5H2O (1mmol) and SbCl3 (1mmol) were dissolved in tetraethyleneglycole (TEG, 20ml) as a solvent by sonicating. After the solution was bubbled with Ar gas and strongly agitated at room temperature, a reducing agent NaBH4 (320 mg) dissolved in TEG (10 ml) was added slowly, and the Bi-Sb alloy was synthesized by heating to 180 oC in Ar gas. The synthesized particles in the solution were settled by centrifugation, washed with ethanol and TEG, and dried under a vacuum. The syntheses of Bi-Sb alloy nanoparticles were also attempted in various experimental conditions. The reaction products were characterized by X-ray diffraction (XRD), and transmission electron microscopy (TEM). A single phase of Bi-rich Bi-Sb alloy was identified by XRD analysis. Agglomerate of the Bi-Sb alloy particles with nano-order size were confirmed by TEM observation.

Synthesis of Higher Manganese Silicide by Pulse Discharge Sintering Method 査読有り

M. Yoshikura, T. Itoh

Abtsracts of R'09 Twin World Congress Nagoya Venue 頁： 98 2009年10月

記述言語：英語

Higher manganese silicide (HMS) is a promising thermoelectric material available to thermoelectric power generation using the disposed heat resources of 500 to 900K. Since both of Mn and Si as constituent elements in the manganese silicide are harmless and they exist in abundance as mineral resources, the manganese silicide can become a low-cost thermoelectric material with low-environmental load. Though combination of mechanical alloying (MA) and pulse discharge sintering (PDS), that is a conventional method, may be an effective method for synthesizing HMS compound, difference of loss ratios of Mn and Si during MA process causes problems of composition shifts and poor reproductivity. In this study, a new synthesizing method of HMS was attempted. Mn and Si powders (75μm, 99.9%) were individually ground by mechanical grinding (MG) with a planetary ball milling equipment at 400 rpm for 1h. The ground powders with particle size of 44μm or less were collected by sieving. The collected Mn and Si powders were mixed at the molar ratio of 1:1.73 (a composition ratio of HMS) with a rotary blender at 75 rpm for 1h. HMS compound was synthesized from the mixed powder and simultaneously sintered by PDS at 1173K for 15 min under 60 MPa. From XRD analysis of the material consolidated by the new method, HMS phase was detected as a main phase, but MnSi phase was also detected as well as the material obtained by the conventional method. The synthesis was carried out under various experimental conditions, and thermoelectric properties were measured.

Influence of Carbon Nanotube Addition on Thermoelectric Properties of Skutterudite-type Cobalt Antimonide Compound 査読有り

M. Tachikawa, T. Itoh

Abstracts of R'09 Twin World Congress Nagoya Venue 頁： 98 2009年10月

記述言語：英語

Skutterudite-type cobalt antimonide compounds are well known as materials with good thermoelectric properties over temperature range of 300-600 oC. However, their thermal conductivity is relatively high, and lowering of the thermal conductivity is required for further improving thermoelectric performance. This study aims at lowering the lattice thermal conductivity by the phonon scattering induced from dispersing uniformly carbon nanotubes (CNTs) into the cobalt tri-antimonide compound. Powders of Co, Ni, Sb and Te were blended with molar ratios of n-type Co0.92Ni0.08Sb2.96Te0.04 compound, and the compound was synthesized through a pulse discharge sintering (PDS) process. After coarsely grinding the synthesized compound, CNTs were added into the compound powder at different fraction, and then the mixture was mechanically ground with a planetary ball milling equipment. The composite powder obtained by the mechanical grinding (MG) was compacted and sintered by PDS. Dispersion condition of CNTs was observed by scanning electron microscopy (SEM). Thermoelectric properties (Seebeck coefficient, electrical resistivity and thermal conductivity) of the sintered samples were measured. It was confirmed by SEM observation that the fibriform CNTs existed uniformly in the Co0.92Ni0.08Sb2.96Te0.04 compound matrix. The addition and dispersion of CNTs into the compound decreased the thermal conductivity, but increased the electrical resistivity.

Synthesis of Thermoelectric Manganese Silicide by Mechanical Alloying and Pulse Discharge Sintering 査読有り

T. Itoh and M. Yamada

J. Electronic Materials 38 巻 ( 7 ) 頁： 925-929 2009年7月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

Manganese silicide is a candidate for low-cost thermoelectric materials with low-environmental load. In this research, MnSi1.73 compound was studied as a thermoelectric material available for the thermoelectric power generation using waste heat. Manganese and silicon powders were mechanically alloyed under three different conditions (at 200 rpm for 36 ks, at 400 rpm for 3.6 ks and at 400 rpm for 36 ks) with a planetary ball milling equipment. Then, the mechanical alloyed powder was consolidated by a pulse discharge sintering process. Phases of MnSi1.73 (primary phase) and MnSi were synthesized in mechanical alloying and pulse discharge sintering. Thermoelectric properties were dependent on the mechanical alloying condition. The sample mechanically alloyed at 400 rpm for 3.6 ks had the best thermoelectric performance. The maximum dimensionless figure of merit ZT of 0.47 was achieved at 873K.

Thermoelectric Properties of Al-doped Mg₂Si Compounds Prepared by Liquid-Solid Phase Reaction and Pulse Discharge Sintering 査読有り

T. Itoh, M. Matsuno

Abstracts of ICT2009 頁： 187 2009年7月

担当区分：筆頭著者記述言語：英語

Dimagnesium silicide is a candidate for thermoelectric materials available for the thermoelectric power generation using waste heat. This material has advantages of the constituent elements in abundance in the earth's crust and of the nontoxicity of its processing by-products as an environmental symbiosis thermoelectric semiconductor. Mg2Si Compounds doped with Al from 0 to 0.2 mol% were synthesized from Al, Mg and Si powders by a liquid-solid phase reaction method. The compounds were sintered through a pulse discharge sintering process. Influence of Al content on thermoelectric properties of Mg2Si compounds was investigated. Although Al-doping decreased the absolute value of Seebeck coefficient and increased the thermal conductivity, it drastically decreased the electrical resistivity. The maximum dimensionless figure of merit of 0.47 at 509 oC was achieved in Mg2Si doped with 0.2 mol% Al.

Syntheses of Ni-doped and Fe-doped CoSb₃ Thermoelectric Nanoparticles through Modified Polyol Process 査読有り

T. Itoh, K. Isogai

Abstracts of 2009 MRS Spring Meeting CD-ROM 巻頁： N3.16 2009年4月

担当区分：筆頭著者記述言語：英語

Skutterudite CoSb3 compounds are of increasing interest as materials with good thermoelectric performance over the temperature range of 600 to 800 K, but the thermal conductivity of the materials is relatively high. Nanostructured materials have been shown to enhance phonon scattering and lower the thermal conductivity of the thermoelectric materials. We have investigated about the synthesis of binary CoSb3 nanoparticles through a modified polyol process. Partial substitution of Ni or Fe on the Co site of CoSb3 is a hopeful route for improving thermoelectric performance of the CoSb3 compounds. In the present work, synthesis of Ni-doped and Fe-doped CoSb3 nanoparticles through the modified polyol process was attempted and the optimum synthesizing condition was investigated. Co(OOCH3)2.4H2O, Ni(OOCH3)2.4H2O, FeCl3 and SbCl3, were prepared as precursors. The precursors were reduced by NaBH4 in tetraethyleneglycol at 513 K in argon gas, for different reaction time (holding time). The reaction products were characterized by the X-ray diffraction, the energy dispersive X-ray spectroscopy, and transmission electron microscopy. The nanoparticles with about 20 to 30 nm in size mainly existed in the reaction products regardless of the chemical composition and the reaction time. The skutterudite phase was identified as a main phase in the sample synthesized for long reaction time, but the other phases of Sb and MSb2 (M=Co, Ni, Fe) were also detected. The lattice parameter of the synthesized skutterudite phase linearly increased with increasing the doping agent concentration, following Vegard's law.

新たな手法による熱電発電用モジュールの作製とその特性評価査読有り

生田裕二，伊藤孝至

粉体および粉末冶金 56 巻 ( 1 ) 頁： 30-34 2009年1月

圧縮ねじり成形法によるBi-Sb-Te系熱電材料の固化と組織制御査読有り

伊藤孝至, 門井　崇, 金武直幸

日本金属学会誌 73 巻 ( 1 ) 頁： 1-6 2009年1月

液相－固相反応法によるマグネシウムシリサイド化合物の合成とその熱電特性査読有り

松野光晴, 伊藤孝至

粉体および粉末冶金 56 巻 ( 1 ) 頁： 26-29 2009年1月

Thermoelectric Properties of Sintered Bodies Made of Synthesized CoSb3 Nanoparticles

K. Isogai and T. Itoh

Abstracts of The IUMRS International Coference in Asia 2008 頁： CD-ROM UP-10 2008年12月

記述言語：英語

CoSb3 based skutterudite compounds are the promising thermoelectric materials that have relatively good thermoelectric properties with respect to the Seebeck
coefficient and the electrical resistivity over temperature range of 600-800 K. The high thermal conductivity of the materials, however, prevents from achieving high thermoelectric performance. Superfine
grain structure made by sintering superfine particles is expected to lower the thermal conductivity by phonon scattering. In our previous work, we have reported the CoSb3 nanoparticles synthesis via a modified polyol process. In the present work, we focused at investigating the thermoelectric properties of the sintered bodies made of the synthesized CoSb3 nanoparticles. The CoSb3 nanoparticles were synthesized via the modified polyol process. Two reactants Co(OOCH3)2·4H2O and SbCl3 were mixed
at a stoichiometric mole ratio of 1:3, and were reacted with a reducing agent NaBH4 in a solvent tetraethyleneglycol at 513 K. Then, the reaction products were sintered into bulk samples by a pulse discharge
sintering (PDS) under several operating conditions. The synthesized nanoparticles and the sintered samples were
characterized with respect to the synthesized phases, the particle size and the grain size. The Seebeck coefficient, the electrical resistivity and the thermal conductivity of the sintered samples were also measured. The nanoparticles with size about 20 to 30 nm mainly existed in the reaction products. The CoSb3 phase was identified, but the other phases of Sb and CoSb2 were also detected. It was found
that the synthesis of CoSb3 is promoted by PDS process. In the sample sintered at 853K for 15min under 60MPa, the grains with size about 200nm mainly existed together with several tens nanometer sized grains. The thermal conductivity of the fine grain sized sample was sufficiently reduced compared with that of the sample
synthesized and sintered by only PDS process.

Thermoelectric Properties of Sintered Bodies Made of Synthesized CoSb₃ Nanoparticles

K. Isogai and T. Itoh

Abstracts of The IUMRS International Coference in Asia 2008 頁： CD-ROM UP-10 2008年12月

記述言語：英語

CoSb3 based skutterudite compounds are the promising thermoelectric materials that have relatively good thermoelectric properties with respect to the Seebeck coefficient and the electrical resistivity over temperature range of 600-800 K. The high thermal conductivity of the materials, however, prevents from achieving high thermoelectric performance. Superfine grain structure made by sintering superfine particles is expected to lower the thermal conductivity by phonon scattering. In the present work, we focused at investigating the thermoelectric properties of the sintered bodies made of the synthesized CoSb3 nanoparticles. The CoSb3 nanoparticles were synthesized via the modified polyol process. Two reactants Co(OOCH3)2·4H2O and SbCl3 were mixed at a stoichiometric mole ratio of 1:3, and were reacted with a reducing agent NaBH4 in a solvent tetraethyleneglycol at 513 K. Then, the reaction products were sintered into bulk samples by a pulse discharge sintering (PDS) under several operating conditions. The nanoparticles with size about 20 to 30 nm mainly existed in the reaction products. The CoSb3 phase was identified, but the other phases of Sb and CoSb2 were also detected. It was found that the synthesis of CoSb3 is promoted by PDS process. In the sample sintered at 853K for 15min under 60MPa, the grains with size about 200nm mainly existed together with several tens nanometer sized grains. The thermal conductivity of the finegrain sized sample was sufficiently reduced compared with that of the sample synthesized and sintered by only PDS process.

Fabrication of Thermoelectric Module by A New Manufacturing Process and Its Performance

Y. Ikuta and T. Itoh

Abstracts of The IUMRS International Coference in Asia 2008 頁： CD-ROM UP-8 2008年12月

記述言語：英語

In the conventional production of the thermoelectric modules, process automation is difficult since the thermoelectric elements are produced by slicing only one at a time and the assembly of thermoelectric modules requires placement and attachment of the individual, and sometimes very small, thermoelectric elements. This leads to high production cost. Thus, new processing methods will be required for cost-effectively producing compact thermoelectric modules with a multitude of thermoelectric couples. In the present work, a new manufacturing process was attempted for producing the thermoelectric modules, and performances of the modules were evaluated. Powders of the p-type FeCo3Sb12 and the n-type Co0.92Ni0.08Sb2.96Te0.04 compounds were alternately filled into 4x4 square holes of an insulating mold. The powders in the holes were compacted and sintered simultaneously at 900 K in vacuum for 20 min under the isostatic pressure of 60 MPa. In sintering, a pseudo hot isostatic pressing (pseudo HIP) method were used to prevent the mold from breaking. The sintered elements in the mold were electrically connected in series using silver paste. Then, a thermoelectric module was constructed by parallel sandwiching the mold with glass plates of 0.5mm in thickness. The hot side of the module was heated up to 796 K, and the cold side was cooled by water. The maximum temperature difference between the hot and cold sides was 356 K. The maximum open voltage was 561 mV at the maximum temperature difference of 356 K, and the internal resistance in the module was 1.74 . The output power of 50.1 mW was obtained and the power density of 51.1 mW/cm2 was estimated. The value of output power was less than that of the theoretical calculation. This can be attributed to the high internal resistance due to the low sintering density of each thermoelectric element.

The effect of the sintering conditions and addition of fullerene on thermoelectric properties of Mg2Si

M. Matsuno and T. Itoh

Abstracts of The IUMRS International Coference in Asia 2008 頁： CD-ROM UP-9 2008年12月

記述言語：英語

Magnesium silicide (Mg2Si) is a promising material for thermoelectric energy conversion at intermediate temperature range. This material has advantages of the
abundance of its constituent elements in the earth's crust and of the nontoxicity of its processing by-products as an environmentally friendly thermoelectric semiconductor. However, there are few research reports about this material for improving thermoelectric performance because of difficulty of its synthesis. In this study, Mg2Si was synthesized from Mg and Si by a liquid-solid phase reaction (LSPR) method, which is effective in synthesizing a compound from the two elements having sufficiently different melting points. Firstly, the influence of sintering conditions on the thermoelectric properties of Mg2Si was investigated. The powder synthesized by LSPR method was compacted and then sintered by a pulse discharge sintering (PDS) process. Thermoelectric properties, that is, Seebeck coefficient, electrical resistivity and thermal conductivity of each sintered sample were measured at temperature of 300 to 900 K. All sintered samples indicated the nature of n-type semiconductor over a measuring temperature range. The power factor of the sintered sample was, however, strongly affected by the sintering temperature and/or the sample density. The sample sintered at 1003 K for 30 min under 60MPa had the maximum power factor of about 0.11×10-2 mWm-1K-2 at 464 K. This value is higher than the previous report. Secondly, we attempted to add and disperse the fullerene nanoparticles into Mg2Si compound for lowering the thermal conductivity according to the knowledge obtained in our previous work. Mg2Si powder was mixed with fullerene by a planetary ball milling method, and then sintered by PDS process. In the samples sintered under the
same sintering condition, the power factor decreased with fullerene addition, because the electrical resistivity considerably increased and/or the sample density decreased.

Fabrication of Thermoelectric Module by A New Manufacturing Process and Its Performance

Y. Ikuta and T. Itoh

Abstracts of The IUMRS International Coference in Asia 2008 頁： CD-ROM UP-8 2008年12月

記述言語：英語

In the conventional production of the thermoelectric modules, process automation is difficult since the thermoelectric elements are produced by slicing only one at a time and the assembly of thermoelectric modules requires placement and attachment of the individual, and sometimes very small, thermoelectric elements. This leads to high production cost. Thus, new processing methods will be required for cost-effectively producing compact thermoelectric modules with a multitude of thermoelectric couples. In the present work, a new manufacturing process was attempted for producing the thermoelectric modules, and performances of the modules were evaluated. Powders of the p-type FeCo3Sb12 and the n-type Co0.92Ni0.08Sb2.96Te0.04 compounds were alternately filled into 4x4 square holes of an insulating mold. The powders in the holes were compacted and sintered simultaneously at 900 K in vacuum for 20 min under the isostatic pressure of 60 MPa. In sintering, a pseudo hot isostatic pressing (pseudo HIP) method, in which one-directional load is transmitted isostatically to the sample through the alumina powder filled around the sample, were used to prevent the mold from breaking. The sintered elements in the mold were electrically connected in series using silver paste. Then, a thermoelectric module was constructed by parallel sandwiching the mold with glass plates of 0.5mm in thickness. The hot side of the module was heated up to 796 K, and the cold side was
cooled by water. Under this condition, the thermoelectric performance was evaluated. The maximum open voltage was 561 mV at the maximum temperature difference of 356 K, and the internal resistance in the module was 1.74 Ω. In this case, the output power of 50.1 mW was obtained and the power density of 51.1 mW/cm2 was estimated. The value of output power was less than that of the theoretical calculation. This can be attributed to the high internal resistance due to the low sintering density of each thermoelectric element.

The effect of the sintering conditions and addition of fullerene on thermoelectric properties of Mg₂Si

M. Matsuno and T. Itoh

Abstracts of The IUMRS International Coference in Asia 2008 頁： CD-ROM UP-9 2008年12月

記述言語：英語

Magnesium silicide (Mg2Si) is a promising material for thermoelectric energy conversion at intermediate temperature range. This material has advantages of the abundance of its constituent elements in the earth's crust and of the nontoxicity of its processing by-products as an environmentally friendly thermoelectric semiconductor. However, there are few research reports about this material for improving thermoelectric performance because of difficulty of its synthesis. In this study, Mg2Si was synthesized from Mg and Si by a liquid-solid phase reaction (LSPR) method, which is effective in synthesizing a compound from the two elements having sufficiently different melting points. The powder synthesized by LSPR method was compacted and then sintered by a pulse discharge sintering (PDS) process. All sintered samples indicated the nature of n-type semi-conductor over a measuring temperature range. The power factor of the sintered sample was, however, strongly affected by the sintering temperature and/or the sample density. The sample sintered at 1003 K for 30 min under 60MPa had the maximum power factor of about 0.11×10-2 mWm-1K-2 at 464 K. Mg2Si powder was mixed with fullerene by a planetary ball milling method, and then sintered by PDS process. In the samples sintered under the same sintering condition, the power factor decreased with fullerene addition, because the electrical resistivity considerably increased and/or the sample density decreased. It will be necessary to optimize the sintering conditions for attaining an effective result about the fullerene addition.

Synthesis of Co_1-xNi_xSb₃ Thermoelectric Nanoparticles

K. Isogai, T. Itoh and K. Kitagawa

Abstracts of The 14th International Symposium on Advanced Technology and Applications (ATA) 頁： 42 2008年11月

記述言語：英語

Cobalt-antimony skutterudite compounds have a relatively high power factor over a temperature range of 600 to 800 K, but its thermal conductivity is relatively high. Nanostructuring is expected to lower the lattice thermal conductivity by grain boundary phonon scattering, improving the thermoelectric performance of the materials. Partial substitution of Ni on the Co site of CoSb3 is a hopeful route for obtaining n-type CoSb3-based skutterudite. In the present work, synthesis of Co1-xNixSb3 thermoelectric nanoparticles by the modified polyol process was attempted and the optimum synthesizing condition was investigated. Co(OOCH3)2·4H2O, Ni(OOCH3)2·4H2O and SbCl3 were mixed at the desired composition of x<0.1, and they were reduced by NaBH4 in tetraethyleneglycol at 513 K in an atmosphere of argon gas, for different reaction time (holding time). The nanoparticles of sizes ranging from about 20 to 30 nm mainly existed in the reaction products regardless of the composition and the reaction time. The skutterdite phase is identified as the main phase in the sample synthesized for the longer reaction time, but the other phases of Sb and MSb2 (M=Co, Ni) are also detected. The lattice constant of the synthesized skutterudite phase was almost linearly increased with Ni content. This is in good agreement with the Vegard's law.

Synthesis of Co1-xNixSb3 Thermoelectric Nanoparticles 査読有り

K. Isogai, T. Itoh and K. Kitagawa

Abstracts of The 14th International Symposium on Advanced Technology and Applications (ATA) 頁： 42 2008年11月

記述言語：英語

Cobalt-antimony skutterudite compounds have a relatively high power factor over a temperature range of 600 to 800 K, but its thermal conductivity is relatively high. Nanostructuring is expected to lower the lattice thermal conductivity by grain boundary phonon scattering, improving the thermoelectric performance of the materials. In our previous work, we have reported about the synthesis of p-type CoSb3 nanoparticles via a modified polyol process. Partial substitution of Ni on the Co site of CoSb3 is a hopeful route for obtaining n-type CoSb3-based skutterudite. In the present work, synthesis of Co1-xNixSb3 thermoelectric nanoparticles by the modified polyol process was attempted and the optimum synthesizing condition was investigated. Co(OOCH3)2·4H2O, Ni(OOCH3)2·4H2O and SbCl3 were mixed at the desired composition of x<0.1, and they were reduced by NaBH4 in tetraethyleneglycol at 513 K in an atmosphere of argon gas, for different reaction time (holding time). The reaction products were characterized by the X-ray diffraction, the energy dispersive X-ray spectroscopy, and transmission electron microscopy.The nanoparticles of sizes ranging from about 20 to 30 nm mainly existed in the reaction products regardless of the composition and the reaction time. The skutterdite phase is identified as the main phase in the sample synthesized for the longer reaction time, but the other phases of Sb and MSb2 (M=Co, Ni) are also detected. The lattice constant of the synthesized skutterudite phase was almost linearly increased with Ni content. This is in good agreement with the Vegard's law.

Synthesis of Thermoelectric Manganese Silicide by Mechanical Alloying and Pulse Discharge Sintering

T. Itoh and M. Yamada

Abstracts of ICT2008 (27th International Conference on Thermoelectric) 頁： 53 2008年8月

担当区分：筆頭著者記述言語：英語

Global energy and environmental issues are problems to be urgently solved. Thermoelectric power generation is a hopeful method to decrease dependence of fossil fuels and to promote the environmental safeguards. In this research, manganese silicide MnSi1.73 was focused as one of the promising thermoelectric materials available to the thermoelectric power generation using the disposed heat resources of 500 to 900K. Since both of Mn and Si as constituent elements in the manganese silicide are harmless and they exist in abundance as mineral resources, the manganese silicide can become a low-cost thermoelectric material with low-environmental load. Raw powders of manganese and silicon were mechanically alloyed through a planetary ball milling under the different milling time and the different rotating speed. Then the mechanical alloyed powder was consolidated through a pulse discharge sintering process (at 1023 K for 20 min in vacuum under a pressure of 100 MPa). The manganese silicide phases of MnSi1.73 (primary phase) and MnSi were synthesized in mechanical alloying and pulse discharge sintering. The thermoelectric properties were dependent on an XRD intensity ratio of MnSi1.73 to MnSi. The maximum dimensionless figure of merit ZT of 0.47 was achieved at 873K.

Effect of Combined Addition of Silicon Carbide Whiskers and Fullerene Nanoparticles on Properties of Thermoelectric Zinc Antimonide 査読有り

T. Itoh, N. Asari, N. Kanetake, A. Okada

Mater. Res. Soc. Symp. Proc. 1044 巻頁： 265-272 2008年4月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

Thermoelectric power generation is a hopeful method harnessing waste thermal energy particularly covering a middle temperature range between 500 and 800 K. A Zn4Sb3 compound is a promising "phonon glass electron crystal" material applicable to thermoelectric power generation around 700 K. This material, however, has a problem of its brittleness. In this research, the silicon carbide whiskers were added into the Zn4Sb3 compound for overcoming the brittleness, and the fullerene nanoparticles were also added for improving the thermoelectric performance. The Zn4Sb3 compound was synthesized from mixture of pure zinc and antimony powders by a liquid-solid phase reactions method. Firstly, the synthesized compound powder was mixed with the fullerene nanoparticles. The planetary ball milling method was used in order to disentangle the fullerene agglomerate and to obtain a uniform mixture. Subsequently, the mixture was uniformly mixed with the SiC whiskers by the planetary ball milling. The final mixture was consolidated by the pulse discharge sintering. The synthesized phases were identified by XRD. The morphology of the whiskers after mixing was observed. The flexural strength and the thermoelectric properties of the sintered samples were measured. The length of SiC whiskers and the flexural strength were decreased with the mixing time. Though the addition of SiC whiskers lowered the thermoelectric performance, the combined addition of SiC whiskers and fullerene nanoparticles restored the performance especially through a decrease of the thermal conductivity owing to the phonon scattering.

Thermoelectric Properties of β-Zn4Sb3 Synthesized by Mechanical Alloying and Pulse Discharge Sintering 査読有り

T. Itoh, J. Shan and K. Kitagawa

J. Propulsion and Power 24 巻 ( 2 ) 頁： 353-358 2008年3月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

Thermoelectric power generation is a hopeful method for harnessing waste thermal energy, particularly covering a middle temperature range between 500 and 800 K. A β-Zn4Sb3 compound has become the focus of attention as a thermoelectric material applicable to thermoelectric power generation around 700 K. In this research, a method combining the mechanical allying with the pulse discharge sintering was adopted to obtain the sintered compact of β-Zn4Sb3. Pure zinc and antimony powders were used as the starting material for mechanical alloying. These powders were mixed in the stoichiometry ratio of 4 to 3, or more Zn-rich. The mechanical alloying was carried out by planetary ball milling under conditions of fixed revolution speed and variable milling time. The influence of the milling time on the synthesis of β-Zn4Sb3 was investigated. The sintering was executed at two sintering temperatures and under fixed conditions of sintering time, pressing pressure, and atmosphere. The influences of the sintering temperature of pulse discharge sintering on the polycrystalline grain size and the thermoelectric properties were also studied. The following results were clarified. The phases of ZnSb and Zn are easily obtained by mechanical alloying for 50 h or longer time. These phases change to a single phase of β-Zn4Sb3 through pulse discharge sintering under the optimum condition of Zn-rich mixing. The sintered compact of β-Zn4Sb3 with 1.17 of nondimensional figure of merit can be obtained at 673 K with the proposed mechanical alloying with pulse discharge sintering method.

Thermoelectric Properties of Iron-and Lanthanum-Doped CoSb3 Compounds by Pulse Discharge Sintering 査読有り

T. Itoh, E. Hattori and K. Kitagawa

J. Propulsion and Power 24 巻 ( 2 ) 頁： 359-364 2008年3月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

More than 60% of thermal energy generated through various combustion systems is discharged as waste heat into the atmosphere. Using the waste heat effectively is among the most important issues from a viewpoint of the depletion
of fossil fuels. In this regard, thermoelectric power generation that can directly convert the thermal energy to
electrical energy is one of the attractive methods. Skutterudite compounds of CoSb3 have been investigated as promising candidate materials for thermoelectric power generation. In this research, CoSb3 compounds were synthesized from raw metal powders by using a pulse discharge sintering process. To improve the thermoelectric properties, iron was doped as an element substituting for cobalt of the CoSb3 compound. The syntheses of FexCo1-xSb3 were confirmed by x-ray diffraction analysis. The Seebeck coefficient, electric resistivity, and thermal conductivity were measured as the thermoelectric properties. Optimum content of iron was decided from the maximum thermoelectric figure of merit. Furthermore, filling of lanthanum into Fe0.1Co0.9Sb3 was attempted to decrease the thermal conductivity. The lanthanum-filled Fe0.1Co0.9Sb3 compounds were synthesized from raw metal powders and LaSb powder by the pulse discharge sintering process. The optimum lanthanum content that leads to the maximum thermoelectric performance is discussed. The substitution of iron for cobalt improved the thermoelectric performance. The lanthanum-filling decreased the thermal conductivity at a low lanthanum content and led to higher thermoelectric performance in spite of low lanthanum content.

Effect of Acid Treatment on Removing Sodium Ions from Sodium Cobalt Oxide Thermoelectric Materials

R. Watanabe, T. Itoh, K. Kitagawa

Proc. of International Symposium on EcoTopia Science 2007 頁： CD-ROM 23P01-13 (1100) 2007年11月

記述言語：英語

NaxCo2O4 with a laminar structure is a promising thermoelectric oxide having anisotropic thermoelectric property. An excellent thermoelectric performance equivalent to the single crystal is expected to be attainable in the polycrystalline body of this material by improvement of crystal orientation. It will be effective for controlling the crystal orientation to separate CoO2 nanosheets from the polycrystalline body and to pile them up for making highly orientated layers. This study aims at preparation of the CoO2 nanosheets. First, samples of NaxCo2O4 were synthesized. The interlayer Na+ ions were removed from the CoO2 layers of the synthesized powder by an acid treatment. The interlayer distance of the synthesized and the Na+ ion removed samples was measured by XRD analysis. The removal efficiency of Na+ ions was evaluated from ICP measurement. The morphology of the samples was observed by a SEM. We found that the condition of the acid treatment greatly influences the removal efficiency of Na+ ions in the synthesized NaxCo2O4.

Polyol Process Synthesis of CoSb3 Termoelectric Nanoparticles 査読有り

K. Isogai, T. Itoh

Proc. of International Symposium on EcoTopia Science 2007 頁： CD-ROM 23P01-15 (1122) 2007年11月

記述言語：英語

The cobalt-antimony skutterdite compounds have relatively high power factor at around 380 oC, but they have relatively high thermal conductivity. Nanostructuring is expected to lower the lattice thermal conductivity by phonon scattering on the grain boundary, improving the thermoelectric performance of the materials. In this study, we aim at synthesizing CoSb3 thermoelectric nanoparticles by using polyol process for constructing the nanostructural body of the materials. The polyol process that synthesizes nanoparticles is one of liquid-phase process using polyol as a solvent. The CoSb3 nanoparticles were syn-thesized in mole ratio of Co(OOCH3)·4H2O to SbCl3 of 1:4.5 at reaction temperature of 240 oC in the sol-vent of tetra ethylene glycol. The reaction products were characterized by XRD, EDX, SEM, and TEM. Extremely small particles with about 10 nm in diameter mainly existed in the reaction products. The minimum particle size was 3-5 nm. The nanoparticles were identified as the CoSb3 compounds.

Influence of Fullerene Addition on Thermoelectric Properties of Non-filled/Filled Cobalt-Skutterudite Compounds 査読有り

K. Ishikawa, A. Okada, T. Itoh

Proc. of International Symposium on EcoTopia Science 2007 頁： CD-ROM 23P01-14 (1101) 2007年11月

記述言語：英語

The cobalt-skutterudite compounds are promising thermoelectric materials having relatively good thermoelectric properties with respect to the Seebeck coefficient and the electrical resistivity over the temperature range between 500 and 800K. The high thermal conductivity of the materials, however, prevents from achieving high thermoelectric performance. In this study, we attempted to disperse the fullerene particles uniformly into the cobalt-skutterudite compounds for decreasing the lattice thermal conductivity by phonon scattering. The influence of the fullerene addition on the thermoelectric properties was investigated with respect to both of the n-type non-filled and filled cobalt-skutterudite compounds. The n-type lanthanum-filled cobalt-skutterudite compound was synthesized via the route of mechanical alloying-pulse discharge sintering process. In both of the non-filled and the filled skutterudite samples, the thermal conductivity was decreased with the addition of fullerene. For the non-filled skutterudite, though the electrical resistivity of the samples was increased with the addition of fullerene, the thermoe-lectric performance was improved.

Consolidation and Microstructure Control of Bismuth Telluride Thermoelectric Compounds by Compressive Torsion Forming 査読有り

T. Itoh, T. Kadoi and N. Kanetake

Materials Transactions 48 巻 ( 8 ) 頁： 2056-2061 2007年8月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

Bismuth antimony telluride has the best performance among the p-type thermoelectric materials used in the range of temperature between 300K and 500K. This material has a trigonal-hexagonal scalenohedral crystal structure and the cleavage parallel to the basal plane of the crystal can readily occur. Suppression of the electrical resistivity and the thermal conductivity will be effective for further
improvement of the performance of the thermoelectric elements made from this material. The compressive torsion forming is the severe plastic deformation technique, in which the loads of compression and distortion are simultaneously subjected to the materials without change in its shape. In this work, we applied this technique to the powder of bismuth antimony telluride for consolidation and improvement of the thermoelectric performance by refining the grain structure and by controlling the crystal orientation. The samples consolidated under various forming conditions were investigated with respect to density, microstructure, XRD, texture, and thermoelectric properties. It was found out that the compressive torsion forming is effective for the microstructure control, the grain structure less than
10μm can be obtained, and the thermoelectric performance is
obviously improved by the compressive torsion forming.

*Effect of Fullerene Addition on Thermoelectric Properties of n-type Skutterudite Compound 査読有り

T. Itoh, K. Ishikawa, and A. Okada

Journal of Materials Research 22 巻 ( 1 ) 頁： 249-253 2007年1月

Prediction of Packing Density of Milled Powder Based on Packing Simulation and Particle Shape Analysis 査読有り

Y. Amano, T. Itoh, H. Terao and N. Kanetake

Materials Science Forum 534-536 巻頁： 1621-1624 2007年1月

Fabrication of the Crystal-Oriented Thermoelectric Material Bi2Te3 by Slip Casting under a High Magnetic Field 査読有り

T. Kuribayashi, M. Sung, T. Itoh, K. Sassa, and S. Asai

Materials Transactions 47 巻 ( 9 ) 頁： 2387-2392 2006年9月

Prediction of Packing Density of Milled Powder Based on Packing Simulation and Particle Shape Analysis 査読有り

Y. Amano, T. Itoh, H. Terao, and N. Kanetake

Extended Abstracts 2006 World Congress on Powder Metallurgy & Particulate Materials, KPMI 頁： 1254-1255 2006年9月

Performance of Segmented Thermoelectric Elements Fabricated by Simultaneous Sintering Method 査読有り

T. Itoh, T. Muto, and K. Kitagawa

Proceedings 25th International Conference on Thermoelectric, IEEE ( CD-ROM ) 頁： PB48 2006年8月

アルミニウムの結晶粒微細化に及ぼす圧縮ねじり複合負荷の効果査読有り

金武直幸，青野圭太郎，伊藤孝至，久米裕二

軽金属 56 巻 ( 1 ) 頁： 34-38 2006年1月

Fabrication of Segmented n-type CoSb3/Bi2Te3 Thermoelectric Module and Its Performance 査読有り

T. Muto, T. Itoh, N. Kanetake and K. Kitagawa

Extended Abstracts International Symposium on EcoTopia Science 2005 頁： 587-588 2005年8月

Syntheses of Fe and La Doped CoSb3 Thermoelectric Compounds by Pulse Discharge Sintering 査読有り

T. Itoh, E. Hattori and K. Kitagawa

Extended Abstracts International Symposium on EcoTopia Science 2005 頁： 219-220 2005年8月

Fabrication of Segmented p-type AgSbTe2/Sb2Te3/Bi0.4Sb1.6Te3 Thermoelectric Module and Its Performance 査読有り

T. Muto, K. Tokuda, T. Itoh and K. Kitagawa

Proceedings 24th International Conference on Thermoelectrics, IEEE 頁： 521-524 2005年6月

Thermoelectric Properties of beta- Zn4Sb3 Synthesized by MA- SPS Method 査読有り

T. Itoh, J. Shan and K. Kitagawa

Proceedings The 2nd International Energy Conversion Engineering Conference (IECEC2004), AIAA 頁： AIAA-2004-5564 2004年8月

MA-SPS法によるCoSb3化合物の合成と熱電特性査読有り

伊藤孝至，山下剛，北川邦行

粉体および粉末冶金 51 巻 ( 6 ) 頁： 441-446 2004年6月

米国粉末冶金界が求める技術情報の変遷と軟磁性に及ぼす焼結組織の影響査読有り

鰐部吉基,草加勝司,横山誠二,伊藤孝至

粉体および粉末冶金 51 巻 ( 6 ) 頁： 458-461 2004年6月

Multi-layer coating of SiC, Al2O3 and glaze on C/C composites for oxidation resistance at high temperature 査読有り

Q. Shen, J. Shan, T. Itoh, K. Kitagawa

Journal of the Japan Society of Powder and Powder Metallurgy 51 巻 ( 4 ) 頁： 237-241 2004年4月

p型AgSbTe2-(Bi,Sb)2Te3熱電モジュールの作製とその評価査読有り

久保雅崇,伊藤孝至,徳田公平,単　佳義,　北川邦行

粉体および粉末冶金 51 巻 ( 1 ) 頁： 10-15 2004年1月

Fabrication of Layered p-type AgSbTe2-(Bi,Sb)2Te3 thermoelectric module and its performance (jointly authored) 査読有り

M. Kobo, T. Itoh, K. Tokuda, J. Shan and K. Kitagawa

Proceedings of 2003 International Conference on Thermoelectrics, International Thermoelectric Society 頁： 429-432 2003年8月

Formation of an Environmental Barrier Coating Using DC-RF Hybrid Plasma 査読有り

A. Otsuka, M. Yamamoto, T. Itoh, K. Kitagawa and S. Hirano

Journal of American Ceramic Society 86 巻 ( 7 ) 頁： 1068-1075 2003年7月

Microstructural Dependency of Soft Magnetism in a Sintered Stainless Fe-12%Cr Alloy 査読有り

Y.Wanibe,T. Itoh and K. Kusaka

Advances in Powder Metallurgy & Particulate Materials -2003, MPIF ( 7 ) 頁： 14-27 2003年6月

気孔の定量評価査読有り

鰐部吉基,伊藤孝至,横山誠二,草加勝司

粉体および粉末冶金 49 巻 ( 6 ) 頁： 541-544 2002年6月

Microstructural Characterizations of Pores and Grains for Specific Properties in P/M Soft Magnetic Materials 査読有り

T.Itoh, K.Kusaka and Y.Wanibe

Advances in Powder Metallurgy & Particulate Materials -2002, MPIF ( 14 ) 頁： 113-122 2002年6月

自動車用ＰＭ軟磁性合金について（ＰＭ軟磁性合金の磁気特性と焼結孔の関係）査読有り

草加勝司,伊藤孝至,鰐部吉基

粉体および粉末冶金 49 巻 ( 5 ) 頁： 430-437 2002年5月

Quantitative Assessment of Pores to Reduce Variations in Component Characteristics 査読有り

Y.Wanibe,T. Itoh, S. Yokoyama and K. Kusaka

Advances in Powder Metallurgy & Particulate Materials -2001, MPIF ( 11 ) 頁： 1-9 2001年5月

ソフト磁性材料の特性改善のための気孔の定量評価について査読有り

伊藤孝至,草加勝司,鰐部吉基

電気製鋼 72 巻 ( 2 ) 頁： 71-75 2001年2月

Achievements in New Quantitative Approach to Powder Technology 招待有り査読有り

Y.Wanibe and T.Itoh

Journal of the Japan Society of Powder and Powder Metallurgy 47 巻 ( 12 ) 頁： 1291-1299 2000年12月

Characterization of Pores for Specific Properties in P/M Soft Magnetic Materials 査読有り

T.Itoh, K.Kusaka and Y.Wanibe

Proceedings Powder Metallurgy World Congress & Exhibition 2000, Jpn. Soc. of Powder and Powder Metallurgy 2 巻頁： 1364-1367 2000年12月

Shape Separation of Powder Particles and Simulation 査読有り

T.Itoh and Y.Wanibe

Proceedings Powder Metallurgy World Congress & Exhibition 2000, Jpn. Soc. of Powder and Powder Metallurgy 1 巻頁： 429-432 2000年11月

Simulation for Estimation of Morphology of Projected Image from Sectioned Image of Iron Powder Particles 査読有り

T.Itoh and Y.Wanibe

Advances in Powder Metallurgy & Particulate Materials -2000, MPIF ( 1 ) 頁： 119-128 2000年6月

粉末冶金用粉体の形状に基づく分級に関する技術開発と評価査読有り

伊藤孝至,鰐部吉基

粉体および粉末冶金 46 巻 ( 9 ) 頁： 914-920 1999年9月

Measurement and Simulation of Morphological Characteristics on Projected and Sectioned Images of Iron Powder Particles 査読有り

T.Itoh and Y.Wanibe

Advances in Powder Metallurgy & Particulate Materials -1999, MPIF 12 巻頁： 139-149 1999年6月

Relationship between Compacting Behaviors and Morphological Characteristics for Metallic Powders 査読有り

T.Itoh and Y.Wanibe

Journal of the Japan Society of Powder and Powder Metallurgy 46 巻 ( 1 ) 頁： 16 1999年1月

Mutual Relation between Distributions Based on Number and Mass in The Particle Size-Shape Dispersion Diagram 査読有り

T.Itoh and Y.Wanibe

Journal of the Japan Society of Powder and Powder Metallurgy 45 巻 ( 6 ) 頁： 574-580 1998年6月

粉粒体の形態特性に基づく流動と充填の定量解析

伊藤孝至, 鰐部吉基

材料とプロセス-粉体の流動、充填および成形- 10 巻 ( 5 ) 頁： 1062-1066 1997年9月

粉末プロセシングにおける定量評価

鰐部吉基, 伊藤孝至

鉄鋼の粉末冶金における新しい展開, 日本鉄鋼協会頁： 32-38 1997年9月

Random Packing Simulation of Spheres and Practical Application for Real Powders 査読有り

T.Itoh and Y.Wanibe

Proceedings International Workshop on Modeling of Metal Powder Forming Processes 頁： 169-178 1997年7月

Morphological Characterization of Iron Powders and The Estimating of Density Through Random Packing Simulation 査読有り

T. Itoh and Y. Wanibe

Advances in Powder Metallurgy & Particulate Materials -1996, MPIF 1 巻 ( 4 ) 頁： 41-51 1996年6月

熱硬化型導電性ペーストにおける金属粉粒径分布の導電性に対する影響(共著) 査読有り

佐藤次郎,林善夫, 伊藤孝至,鰐部吉基

粉体および粉末冶金 42 巻 ( 10 ) 頁： 1099-1102 1995年10月

介在物形態(粒度・形状)に関する新定量解析法

鰐部吉基, 伊藤孝至

「金属中の介在物評価技術の現状と展望」,日本金属学会頁： 28-31 1995年9月

Analysis on Packed Mixtures of Short Fibers and Powders by their Characterized Specifics of Morphology 査読有り

T.Itoh, Y.Wanibe and K.kuroda

Journal of the Japan Society of Powder and Powder Metallurgy 42 巻 ( 9 ) 頁： 992-997 1995年9月

Application of new techniques for characterization of non-metallic inclusions in steel 査読有り

Y.Wanibe, T.Itoh, K.Umezawa, H.Nagahama and Y.Nuri

Steel Research 65 巻 ( 4 ) 頁： 172-177 1995年4月

Effect of Particle Characteristics on Fluidity of Metallic Powders (jointly authored) 査読有り

T.Itoh and Y.Wanibe

Journal of the Japan Society of Powder and Powder Metallurgy 41 巻 ( 9 ) 頁： 1111-1116 1994年9月

Characterization of Short Fibers and Packing Densities of Its Mixtures with Powders 査読有り

T.Itoh and Y.Wanibe

Advances in Powder Metallurgy & Particulate Materials -1994, MPIF 2 巻頁： 113-126 1994年5月

粉末プロセシングの定量キャラクタリゼーション査読有り

鰐部吉基,伊藤孝至

電気製鋼 65 巻 ( 2 ) 頁： 135-144 1994年4月

A Study on Quantitative Analysis in Powder and Powder Processing (jointly authored) 査読有り

T.Itoh and Y.Wanibe

Journal of the Japan Society of Powder and Powder Metallurgy 41 巻 ( 3 ) 頁： 215 1994年3月

New methodology for the determination of mass transport rate from rotating disks and/or cylinders in Liquid 査読有り

Y.Wanibe, E.Boschatzke, F.Oeters and T.Itoh

Steel Research 64 巻 ( 2 ) 頁： 58 1994年2月

Size Distributions Determined on Random Plane Sections of Non-Spherical Particles 査読有り

Y.Wanibe, T.Itoh, Y.Terada and T.Ohara

Journal of the Japan Society of Powder and Powder Metallurgy 40 巻 ( 11 ) 頁： 1113-1116 1993年11月

Shape Function of Non-Spherical Particles for the Determination of the Size Distributions from Measurements Made on the Random Plane Sections 査読有り

Y.Wanibe, T.Itoh, Y.Terada and T.Ohara

Journal of the Japan Society of Powder and Powder Metallurgy 40 巻 ( 11 ) 頁： 1109-1112 1993年11月

Comparison between the Size Distribution Determined on Random Plane Sections and Projected Shadows of Non-Spherical Particles 査読有り

Y.Wanibe, T.Itoh, Y.Terada and T.Ohara

Journal of the Japan Society of Powder and Powder Metallurgy 40 巻 ( 11 ) 頁： 1117-1120 1993年11月

Estimation of Density in Packed Beds of Non-Spherical Particles through New Modeling 査読有り

T.Itoh and Y.Wanibe

Proceedings 1993 Powder Metallurgy World Congress, Jpn. Soc. of Powder and Powder Metallurgy 1 巻頁： 319-322 1993年7月

Size Distribution of Non-Spherical Objects From Measurements Made on Random Plane Sections and of Projected Shadows 査読有り

Y.Wanibe and T.Itoh

Proceedings 1993 Powder Metallurgy World Congress, Jpn. Soc. of Powder and Powder Metallurgy 1 巻頁： 1063-1066 1993年7月

Analysis in Size Distribution of Non-Spherical Particles from Measurement Made on the Random Plane Sections

Y.Wanibe and T.Itoh

11432 巻頁：化II-1-19 1993年6月

Quantitative Analysis in Heterogeneous Materials and Processing

Y.Wanibe and T.Itoh

11323 巻頁：反応-764 1992年5月

Particle size-shape dispersion diagram and its application for the packing densities of metallic powders 査読有り

T.Itoh and Y.Wanibe

Preprints '5th European Symposium Particle Characterization' 2 巻頁： 691-701 1992年3月

Quantitative analysis in heterogeneous materials and processing 査読有り

Y.Wanibe and T.Itoh

Preprints '5th European Symposium Particle Characterization' 1 巻頁： 243-257 1992年3月

分散粒子の諸特性（粒度・形状及びそれらの分布幅）が粒子挙動（充填密度）に及ぼす影響量について

鰐部吉基, 伊藤孝至

日本学術振興会第19委員会資料頁：介在物-62 1992年2月

Impact Atomization of Liquid Metals 査読有り

Y.Wanibe, T.Itoh and Y.Matsui

International Journal of Powder Metallurgy 27 巻 ( 3 ) 頁： 195-209 1991年7月

Particle Shape Distribution and Particle Size-Shape Dispersion Diagram 査読有り

T.Itoh and Y.Wanibe

Powder Metallurgy 34 巻 ( 2 ) 頁： 126-134 1991年4月

粒子形状分布と粒度－形状分散図

鰐部吉基, 伊藤孝至

日本学術振興会第19委員会資料頁：介在物-15 1990年11月

Expansion during Liquid Phase Sintering of Iron-Copper Compacts 査読有り

Y.Wanibe, H.Yokoyama and T.Itoh

Powder Metallurgy 33 巻 ( 1 ) 頁： 65- 69 1990年1月

Quantative Analysis of Anisotropic Shrinkage during Sintering of Cylindrical Iron and Nickel Compacts 査読有り

Y.Wanibe, N.Fujitsuna, T.Itoh and H.Yokoyama

Powder Metallurgy 32 巻 ( 3 ) 頁： 195-203 1989年7月

Anisotropic Shrinkage and Thermal Expansion during Sintering of Cylindrical Nickel and Iron Compacts 査読有り

Y.Wanibe, N.Fujitsuna, T.Itoh and H.Yokoyama

Powder Metallurgy 32 巻 ( 3 ) 頁： 191-194 1989年7月

どのように詰まってゆくか-粉体の充てんに関するシミュレーション- 招待有り

伊藤孝至

バウンダリー 5 巻 ( 6 ) 頁： 65-69 1989年6月

粉末冶金法の物理化学における原点－粉粒体の製品化プロセスにおけるキャラクタリゼーション－招待有り

鰐部吉基,伊藤孝至

鉄と鋼 74 巻 ( 8 ) 頁： 1526-1534 1988年8月

Derivation of Number Based Size Distribution from Modified Mass Based Rosin-Rammler Distribution and Estimation of the Various Mean Particle Diameters 査読有り

T.Itoh and Y.Wanibe

Transactions of the Japan Institute of Metals 29 巻 ( 8 ) 頁： 671-684 1988年8月

Pulverization of Molten Sn and Sn-Cu by a Bladed Rotator Method 査読有り

T.Itoh, Y.Wanibe and K.Matsumoto

Transactions of the Iron and Steel Institute of Japan 28 巻 ( 7 ) 頁： 561-568 1988年7月

粉体プロセシングの物理化学における条件

坂尾　弘, 鰐部吉基, 伊藤孝至

日本学術振興会第19委員会資料 10849 巻頁：反応-664 1988年2月

個数基準の新しいRosin-Rammler分布と各種平均粒径の算出査読有り

伊藤孝至,鰐部吉基,坂尾　弘

日本金属学会誌 51 巻 ( 10 ) 頁： 956-964 1987年10月

Al2O3-SiO2系れんがにおける気孔内への溶融FeO-SiO2スラグによる滓化反応を伴う浸透査読有り

横山誠二,鰐部吉基,伊藤孝至,藤澤敏治,坂尾弘

鉄と鋼 73 巻 ( 3 ) 頁： 491-497 1987年3月

粉体のランダム充てんモデルによる充てん密度と粒度分布との関係査読有り

伊藤孝至,鰐部吉基,坂尾　弘

日本金属学会誌 50 巻 ( 8 ) 頁： 740-746 1986年8月

2成分粒子群のランダム充てんモデルによる充てん密度の解析査読有り

伊藤孝至,鰐部吉基,坂尾　弘

日本金属学会誌 50 巻 ( 5 ) 頁： 475-479 1986年5月

粒度分布をもつ粉体のランダム充てん過程のシミュレーションとその充てん構造の解析査読有り

伊藤孝至,鰐部吉基,坂尾　弘

日本金属学会誌 50 巻 ( 4 ) 頁： 423-429 1986年4月

粒度分布を表わす修正Rosin-Rammler式とその質量基準と個数基準との相互関係査読有り

伊藤孝至,鰐部吉基,坂尾　弘

日本金属学会誌 49 巻 ( 8 ) 頁： 670-677 1985年8月

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