Country：Japan

Country：Japan

Authorship：Corresponding author   Language：Japanese  

DOI： 10.2497/jjspm.68.399

Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.2320/matertrans.Y-M2020862

Web of Science

Language：Japanese   Publishing type：Research paper (scientific journal)  

We report on the synthesis of Mg₂Si thin films from a Mg-Si solution by thermal treatment of Mg on a Si substrate under an Ar gas atmosphere. The Mg was prepared by two methods. One is to deposit Mg films by thermal evaporation, and another is to simply place Mg ribbons on Si. After thermal treatment, a two-layer structure consisting of oxide and ~1 μm-thick Mg₂Si films with {100} preferential orientation was observed for the sample prepared by thermal evaporation. On the other hand, ~10 μm-thick single layer Mg₂Si with more random orientations and cracks was formed for the Mg ribbon contact samples. Possible mechanisms for different structures, crystal orientations, and crack formation are discussed.

DOI： 10.35848/1347-4065/ab6b79

DOI： 10.35848/1347-4065/ab6b79

Web of Science

Other Link： https://iopscience.iop.org/article/10.35848/1347-4065/ab6b79/meta

Language：English   Publishing type：Research paper (scientific journal)  

Fused deposition modelling (FDM) type of 3D printing is widely used for manufacturing complex shaped polymer products. Recently, the metal/polymer composite products can be made by 3D printer using metal/polymer composite filament. Now, we are planning to develop a new manufacturing process of the thermoelectric (TE) elements or modules by combining the FDM-type 3D printing and the degreasing-sintering process. In this work, we focused on the degreasing-sintering process of the mixture of Mg₂Si and polylactic acid (PLA) powders. Mg₂Si compound powder was synthesized by a liquid-solid phase reaction (LSPR) method. The powder mixtures of Mg₂Si, Al and PLA were pressed and heated in a pulse discharge sintering (PDS) chamber under a vacuum in various degreasing conditions. Following the degreasing, the sintering of Mg₂Si was carried out in the same PDS chamber at various starting sintering temperatures. Sintered density, Seebeck coefficient and electrical resistivity of the consolidated Mg₂Si were measured and the power factor as a TE performance was estimated from the TE properties. The optimum conditions of degreasing-sintering process maximizing the sintered density and the TE performance of Al-doped Mg₂Si were investigated. Furthermore, the influences of the additive amount of Al on the sintered density and the TE performance of Mg₂Si fabricated via the optimized degreasing-sintering process were investigated.

DOI： 10.1557/adv.2020.87

DOI： 10.1557/adv.2020.87

Web of Science

Authorship：Lead author   Language：Japanese  

DOI： 10.2497/jjspm.66.80

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.2497/jjspm.65.713

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

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

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)  

DOI： 10.2497/jjspm.64.501

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.2497/jjspm.63.491

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.2320/matertrans.Y-M2016812

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1557/adv.2016.374

Language：English   Publishing type：Research paper (scientific journal)  

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

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)  

Authorship：Lead author   Language：Japanese  

Language：English   Publishing type：Research paper (scientific journal)  

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

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)  

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1557/opl.2014.446

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1016/j.mseb.2013.11.012

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1557/opl.2012.1644

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

Language：English  

Authorship：Lead author   Language：English  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1007/s11664-011-1862-z

Language：English   Publishing type：Research paper (scientific journal)  

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

Authorship：Lead author   Language：Japanese  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：English  

Language：English  

Language：English  

Language：English  

Language：English  

Language：English  

Language：English  

Language：English  

Language：English  

Language：English  

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1557/opl.2011.515

Language：English   Publishing type：Research paper (scientific journal)  

DOI： 10.1088/1757-899X/18/14/142009

Authorship：Lead author   Language：English  

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

Language：English  

Authorship：Lead author   Language：English  

Language：English  

Authorship：Lead author   Language：English  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Thermoelectric power generation is a promising green energy system recovering waste heat. CoSb₃ skutterudite compound is a candidate material for thermoelectric power generation. For improving thermoelectric performance of the material, it is necessary to lower the thermal conductivity. In this work, Al₂O₃ nanoparticles were added and dispersed by mechanical grinding (MG) into n-type CoSb₃ compound prepared by pulse discharge sintering (PDS) method. Over long MG treatment brought high electrical resistivity, lowering thermoelectric performance of the Al₂O₃ nanoparticles added CoSb₃ compound. Seebeck coefficient almost did not change regardless of additional amount of Al₂O₃ nanoparticles. Increasing additional amount of Al₂O₃ nanoparticles brought increasing electrical resistivity and decreasing thermal conductivity. It is found that there is an optimal additional amount of Al₂O₃ nanoparticles that leads to improvement of thermoelectric performance of the CoSb₃ compound. The maximum thermoelectric performance (ZT=0.58) was achieved at 684K in the CoSb₃ compound including Al₂O₃ nanoparticles of 0.1mass%.

Authorship：Lead author   Language：English  

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

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

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.

Language：English  

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.

Language：English  

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.

Language：English  

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.

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

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.

Authorship：Lead author   Language：English  

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.

Authorship：Lead author   Language：English  

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.

Language：Japanese   Publishing type：Research paper (scientific journal)  

Authorship：Lead author   Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：Japanese   Publishing type：Research paper (scientific journal)  

Language：English  

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.

Language：English  

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.

Language：English  

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.

Language：English  

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.

Language：English  

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.

Language：English  

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.

Language：English  

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&#903;4H2O, Ni(OOCH3)2&#903;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.

Language：English  

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&#903;4H2O, Ni(OOCH3)2&#903;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.

Authorship：Lead author   Language：English  

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.

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

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.

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

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-Zn<SUB>4</SUB>Sb<SUB>3</SUB> 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-Zn<SUB>4</SUB>Sb<SUB>3</SUB>. 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-Zn<SUB>4</SUB>Sb<SUB>3</SUB> 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-Zn<SUB>4</SUB>Sb<SUB>3</SUB> through pulse discharge sintering under the optimum condition of Zn-rich mixing. The sintered compact of β-Zn<SUB>4</SUB>Sb<SUB>3</SUB> with 1.17 of nondimensional figure of merit can be obtained at 673 K with the proposed mechanical alloying with pulse discharge sintering method.

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

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 CoSb<SUB>3</SUB> have been investigated as promising candidate materials for thermoelectric power generation. In this research, CoSb<SUB>3</SUB> 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 CoSb<SUB>3</SUB> compound. The syntheses of Fe<SUB>x</SUB>Co<SUB>1-x</SUB>Sb<SUB>3</SUB> 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 Fe<SUB>0.1</SUB>Co<SUB>0.9</SUB>Sb<SUB>3</SUB> was attempted to decrease the thermal conductivity. The lanthanum-filled Fe<SUB>0.1</SUB>Co<SUB>0.9</SUB>Sb<SUB>3</SUB> 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.

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Na<SUB>x</SUB>Co<SUB>2</SUB>O<SUB>4</SUB> 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 CoO<SUB>2</SUB> nanosheets from the polycrystalline body and to pile them up for making highly orientated layers. This study aims at preparation of the CoO<SUB>2</SUB> nanosheets. First, samples of Na<SUB>x</SUB>Co<SUB>2</SUB>O<SUB>4</SUB> were synthesized. The interlayer Na<SUP>+</SUP> ions were removed from the CoO<SUB>2</SUB> layers of the synthesized powder by an acid treatment. The interlayer distance of the synthesized and the Na<SUP>+</SUP> 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<SUP>+</SUP> ions in the synthesized Na<SUB>x</SUB>Co<SUB>2</SUB>O<SUB>4</SUB>.

Language：English  

The cobalt-antimony skutterdite compounds have relatively high power factor at around 380 <SUP>o</SUP>C, 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 CoSb<SUB>3</SUB> 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 CoSb<SUB>3</SUB> nanoparticles were syn-thesized in mole ratio of Co(OOCH<SUB>3</SUB>)&#903;4H<SUB>2</SUB>O to SbCl<SUB>3</SUB> of 1:4.5 at reaction temperature of 240 <SUP>o</SUP>C 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 CoSb<SUB>3</SUB> compounds.

Language：English  

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.

Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

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.

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Spanning a diverse range of materials from metal alloys through to polymers, this book brings the reader up to date with the latest developments in the formulation, characterization and application of powdered materials. Contains a general mathematical background and a step by step guide through the equations necessary for thorough comprehension and quantitative appraisal of different materials and heterogeneous structures The book is intended for final year undergraduate and post graduate students of materials science and engineering and those researchers and industrialists working with powder processing techniques. Topics covered include: * Essence of Quantitative Approach, * Characterization of Powder and Processing, * Particle Sizes, * Particle Shapes, * Distribution of Particle Sizes and Shapes, * Least Square Method, * Applied Science and Engineering, * Packing of Powder, * Powders and Short Fibers
* Fabrication of Powder, * Thermodynamics, * Sintering, * Fluidity of Powder, * Stereology

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Event date： 2011.11

Language：English   Presentation type：Oral presentation (invited, special)  

A thermoelectric power generation system can directly convert a thermal energy into an electric energy without gas emissions, and it is one of the effective green energy systems. The natural energy from sunshine and geothermy and the waste heat discharged from automobile, industrial furnace, refuse incineration furnace and other combustion systems can be used as the heat resources for the thermoelectric power generation. Especially, the power generation system using the waste heat with intermediate temperature (300-600 ^oC), which is discharged from automobile, industrial furnace, and refuses incineration etc., plays a very important role for saving energy and environmental conservation. Thus, the developments on the thermoelectric materials and the modules working effectively in this temperature range are required. Our research group has researched and developed the thermoelectric materials (Zn₄Sb₃, AgSbTe₂, CoSb₃, MnSi_1.73 and Mg₂Si) and the modules constructed with these materials. Among these thermoelectric materials, the silicide materials of MnSi_1.73 (p-type) and Mg₂Si (n-type) begin to attract an attention as promising eco-friendly thermoelectric materials because their constituent elements have no toxicity and exist abundantly in earth crust and they have relatively good thermoelectric performance. In this work, the higher manganese silicide MnSi_1.73 was synthesized through the mutual diffusion process activated by a pulse discharge sintering (PDS) method after individually grinding Mn and Si powders. The MnSi_1.73 synthesized by the method had a better thermoelectric performance than the material synthesized by the conventional fusion method. Next, the Mg₂Si-besed compound was synthesized by a liquid-solid phase reaction (LSPR) method. In the LSPR method, Mg powder and magnesium alloy chips were melted above the melting point of these metals and reacted with Si powder in the solid state, and then the Mg₂Si-based compound powder was synthesized. The powder was consolidated by PDS method. The Mg₂Si-based compound including magnesium alloy elements had a remarkably good thermoelectric performance. The eco-friendly module was fabricated using the thermoelectric elements of MnSi_1.73 and Mg₂Si-based compounds. Joining between the elements and the electrode was carried out by PDS method. The thermoelectric performance of the fabricated module was evaluated. The simulation of the thermoelectric performance of the similar module was also carried out using finite element method (FEM).

Event date： 2011.8

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Venue：東京   Country：Japan  

Event date： 2011.8

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：北海道大学   Country：Japan  

Event date： 2011.7

Language：English   Presentation type：Poster presentation  

Country：United States  

Event date： 2011.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：早稲田大学   Country：Japan  

Event date： 2011.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：早稲田大学   Country：Japan  

Event date： 2011.3

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Venue：神奈川工科大学   Country：Japan  

Event date： 2011.3

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Venue：名古屋大学   Country：Japan  

Event date： 2010.12

Language：English   Presentation type：Poster presentation  

Country：United States  

Event date： 2010.11

Language：Japanese   Presentation type：Poster presentation  

Venue：名古屋大学   Country：Japan  

Event date： 2010.11

Language：Japanese   Presentation type：Poster presentation  

Venue：名古屋大学   Country：Japan  

Event date： 2010.11

Language：Japanese   Presentation type：Poster presentation  

Venue：名古屋大学   Country：Japan  

Event date： 2010.11

Language：English   Presentation type：Poster presentation  

Country：Japan  

Event date： 2010.11

Language：English   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2010.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：京都大学   Country：Japan  

Event date： 2010.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：京都大学   Country：Japan  

Event date： 2010.11

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：京都大学   Country：Japan  

Event date： 2010.10

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Venue：鳥取大学   Country：Japan  

Event date： 2010.9

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Venue：名古屋大学   Country：Japan  

Event date： 2010.6

Language：English   Presentation type：Poster presentation  

Country：China  

Event date： 2010.6

Language：English   Presentation type：Oral presentation (general)  

Country：China  

Event date： 2010.6

Language：English   Presentation type：Oral presentation (general)  

Country：China  

Event date： 2010.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：早稲田大学   Country：Japan  

Event date： 2010.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：早稲田大学   Country：Japan  

Event date： 2010.5

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Venue：東京，TIME24ビル   Country：Japan  

Event date： 2010.4

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Venue：東京理科大学   Country：Japan  

Event date： 2010.4

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Venue：東京・王子　北とぴあ   Country：Japan  

Event date： 2009.11

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

Event date： 2009.11

Language：English   Presentation type：Oral presentation (invited, special)  

Event date： 2009.11

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

Event date： 2009.11

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

Event date： 2009.10

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2009.10

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2009.10

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2009.10

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2009.10

Language：English   Presentation type：Poster presentation  

Country：Japan  

Event date： 2009.10

Language：English   Presentation type：Poster presentation  

Country：Japan  

Event date： 2009.10

Language：English   Presentation type：Poster presentation  

Country：Japan  

Event date： 2009.9

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Venue：名古屋大学   Country：Japan  

Event date： 2009.9

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Country：Japan  

Event date： 2009.8

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

Event date： 2009.7

Language：English   Presentation type：Poster presentation  

Country：Germany  

Event date： 2009.4

Language：English   Presentation type：Poster presentation  

Event date： 2009.4

Language：English   Presentation type：Poster presentation  

Event date： 2009.3

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2009.3

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2009.3

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2009.2

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Country：Japan  

Event date： 2009.2

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Country：Japan  

Event date： 2008.12

Language：English   Presentation type：Poster presentation  

Country：Japan  

Event date： 2008.12

Language：English   Presentation type：Poster presentation  

Country：Japan  

Event date： 2008.12

Language：English   Presentation type：Poster presentation  

Event date： 2008.12

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

Event date： 2008.12

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

Event date： 2008.11

Language：English   Presentation type：Poster presentation  

Event date： 2008.9

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Country：Japan  

CoSb3系熱電材料は熱電特性に優れた有望な熱電材料であるが，熱伝導率を低減させることが課題である．そこで，熱伝導率の低減のためにナノサイズの粒径を持つにCoSb3系熱電材料を化学合成法を用いて合成した成果や，CoSb3系熱電材料にフラーレンを均一に添加して得られた成果を報告する．

Event date： 2008.9

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Country：Japan  

熱エネルギーと電気エネルギーを相互に直接変換できる半導体として熱電材料がある。この材料を用いた発電は、太陽光発電や風力発電と同様に有望な発電方法として期待されている。熱電効果とそれに関連する歴史から、廃熱を有効利用した熱電発電のための最新の研究開発について紹介する。

Event date： 2008.9

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

スクッテルダイト構造を有するCoSb3系化合物は，300～600℃の中温域で比較的優れた熱電性能を持つ材料として知られているが，熱伝導率が比較的大きい熱電材料である．ナノ粒子からバルク体を作製し，結晶粒の微細化を図ることによって，フォノン散乱による格子熱伝導率の低減が期待できる．そこで本研究では，修正ポリオールプロセスを用いてCoサイトをNi原子で一部置換したCo(1-x)NixSb3熱電材料のナノ粒子合成を試みた．

Event date： 2008.9

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

従来の熱電発電モジュールの製造方法では，バルク体からの熱電素子の切り出し，p型とn型素子の配列，電極の接続，パッケージングといった煩雑な製造工程を経ているため，製造コストが高くなってしまうことが問題である．そこで本研究では，製造コスト削減につながる新たな製造手法を提案し，その手法によるモジュールの作製とその性能評価を行った．

Event date： 2008.9

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

熱電材料の一つであるMg2Siは，含まれる元素のMgとSiは共に毒性がなく地球上に豊富に存在する点で大変有望な熱電材料である．しかし，Mg2Siの合成の困難さからその材料の性能向上に関する研究はあまり報告されていない．そこで本研究では，液相－固相反応法を用いてMg2Siの合成を行い，焼結条件やフラーレン添加が熱電性能に及ぼす影響を調査・検討した．

Event date： 2008.8

Language：English   Presentation type：Oral presentation (general)  

Event date： 2008.5

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

本研究では、このCoSb3の熱伝導率を低減するのに，スクッテルダイト構造にゲスト原子を充填する従来の格子熱伝導率を低減する方法とは異なり，ナノ粒子から焼結体を作製することで結晶粒を微細化しフォノン散乱を引き起こして格子熱伝導率の低減を図ることを目的とする．今回，CoSb3熱電材料のナノ粒子製造をナノ粒子合成の液相法のひとつであるポリオールプロセスを用いて化学合成することによって，処理条件を変えて得られたナノ粒子の同定や形態観察を行った．そしてそのナノ粒子からパルス放電焼結法によって焼結体の作製を試みた．

Event date： 2008.5

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

本研究では熱電モジュールにおける製造コスト削減、新たな製造方法の開発を行っている。絶縁体の隔壁間に熱電素子を充填し、同時焼結することで、モジュール作製の工程の簡略化を図った。従来の作製方法のモジュールと比較するために、新たな方法で作製したモジュールの発電特性を測定、評価した。

Event date： 2008.5

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

熱電材料の一つであるMg2Siは，含まれる元素のMgとSiは共に毒性がなく，尚且つ地球上に豊富に存在する点で大変有望な熱電材料である．しかし，Mg2Siの合成の困難さからその材料の性能向上に関する研究はあまり報告されていない．そこで本研究では，液相－固相反応法を用いてMg2Siの合成を種々の条件で試み，焼結条件が熱電性能に及ぼす影響を調査・検討した．

Event date： 2008.3

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Country：Japan  

粉末の粒度分布および形状分布は，粉末冶金プロセスや製品の性質に影響を与える重要な粉末の形態特性である．粉末の粒度と形状を同時に定量評価する新しい方法や粉末の形態特性と粉末特性との関係の定量解析例について紹介する．粉末形態に関連しては，振動を利用した粒子の形状分級方法についても紹介する．また，粉末の充填特性に関連して，球形粒子群のランダム充填シミュレーションと数値計算による充填密度予測方法について紹介する．

Event date： 2007.12

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

Event date： 2007.11

Language：English   Presentation type：Poster presentation  

A Zn4Sb3 compound is a promising "phonon glass electron crystal" material applicable to thermoelectric power generation around 700K. 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.

Event date： 2007.11

Language：English   Presentation type：Poster presentation  

Country：Japan  

Event date： 2007.11

Language：English   Presentation type：Poster presentation  

Country：Japan  

Event date： 2007.11

Language：English   Presentation type：Poster presentation  

Country：Japan  

Event date： 2007.11

Language：English   Presentation type：Poster presentation  

Country：Japan  

Event date： 2007.11

Language：English   Presentation type：Poster presentation  

Country：Japan  

Event date： 2007.11

Language：English   Presentation type：Poster presentation  

Country：Japan  

Event date： 2007.11

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2007.11

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2007.11

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Event date： 2007.9

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

Event date： 2007.9

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Country：Japan  

Event date： 2007.3

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2006.12

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2006.12

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2006.12

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2006.11

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

Event date： 2006.10

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Country：Japan  

Event date： 2006.9

Language：English   Presentation type：Poster presentation  

Event date： 2006.8

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2006.8

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2006.8

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2006.8

Language：English   Presentation type：Poster presentation  

Event date： 2006.6

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2005.12

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Event date： 2005.12

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

Event date： 2005.12

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

Event date： 2005.11

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2005.11

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2005.8

Language：English   Presentation type：Poster presentation  

Country：Japan  

Event date： 2005.8

Language：English   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2005.6

Language：English   Presentation type：Poster presentation  

Event date： 2004.12

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

Event date： 2004.11

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2004.11

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2004.11

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2004.11

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2004.9

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2004.8

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

Event date： 2004.8

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

Event date： 2004.8

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

Event date： 2004.5

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2004.3

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2003.12

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

Event date： 2003.12

Language：Japanese   Presentation type：Poster presentation  

Country：Japan  

Event date： 2003.11

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2003.11

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2003.10

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2003.8

Language：English   Presentation type：Poster presentation  

Event date： 2003.8

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2003.8

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2003.8

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2003.6

Language：English   Presentation type：Oral presentation (general)  

Event date： 2002.11

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2002.11

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2002.5

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Country：Japan  

Event date： 2002.3

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2002.3

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2001.11

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan  

Event date： 2001.11

Language：Japanese   Presentation type：Oral presentation (invited, special)  

Country：Japan  

Event date： 2001.11

Language：Japanese   Presentation type：Oral presentation (general)  

Country：Japan