研究者詳細 - 生田　博志

論文 - 生田　博志

分割表示 277 件中 181 - 200 件目／全件表示 >>

Improvement of the Microstructure of Melt-Processed Sm-Based Superconductors 査読有り

K. Tazoe, H. Ikuta, M. Yoshikawa, Y. Yanagi, Y. Itoh, T. Oka, and U. Mizutani

Physica C 357-360 巻頁： 807 2001年

記述言語：英語掲載種別：研究論文（学術雑誌）

We report on the effect of the atmosphere during the decomposition of the precursors of Sm-Ba-Cu-O bulk superconductors. It was found that the formation of voids was greatly suppressed by two methods, melting in an oxygen gas atmosphere or in vacuum. For both meth-ods, the atmosphere during crystallization was switched to an Ar-gas flowing one. The samples prepared by these methods exhibited high superconducting transition temperatures with sharp transition widths. However, the zero-field critical current density was lower than that of the reference sample, which was prepared by decomposing the precursor in an Ar-gas flowing atmosphere.

Pulsed Field Magnetization of Melt-Processed Sm-Ba-Cu-O 査読有り

H. Ishihara, H. Ikuta, Y. Itoh, Y. Yanagi, M. Yoshikawa, T. Oka, and U. Mizutani

Physica C 357-360 巻頁： 763 2001年

記述言語：英語掲載種別：研究論文（学術雑誌）

We studied the dynamical motion of flux lines in a melt-processed Sm-Ba-Cu-O bulk-superconductor driven by a magnetic pulse using seven small Hall sensors. The time dependence of the magnetic flux density was measured on a crystalline facet line and on an inter-facet region. It was observed that flux lines move faster along the inter-facet region, and a larger amount of magnetic flux is trapped in the facet regions after the application of a magnetic pulse. A comparatively larger pinning effect in the facet region is considered to be responsible for these observations.

Effect of Zn Substitution on the One-Dimensional Metallic Behavior of PrBa_2_Cu_4_O_8_ 査読有り

K. Nakada, H. Ikuta, S. Horii, H. Nozaki, I. Hirabayashi, and U. Mizutani

Physica C 357-360 巻頁： 186 2001年

記述言語：英語掲載種別：研究論文（学術雑誌）

We have grown PrBa_2_(Cu_1-x_Zn_x_)_4_O_8_ single crystals with nominal compositions of x=0, 0.05, 0.10, and 0.15, and measured the resistivity along a- and b-axis directions. For the Zn-free sample, the conduction along the b-axis direction was highly metallic, which persisted up to the x=0.15 sample although the doping of Zn increased the resistivity. On the other hand, the a-axis resistivity of the Zn-free crystal exhibited a peak around 130 K, which is attributable to a switching of the dominant conduction path from the Cu-O chain site at low temperature to the CuO_2_ plane at high temperature. With Zn doping, the peak moves to lower temperature and the resistivity extrapolated to T=0 increases, indicating that Zn doping suppresses the coherent conduction across Cu-O chains.

Thermoelectric Properties of (Ca,Sr,Bi)_2_Co_2_O_5_ Whiskers 査読有り

R. Funahashi, I. Matsubara, H. Ikuta, T. Takeuchi, and U. Mizutani

Materials Transactions 42 巻頁： 956 2001年

Melt-Processed RE-Ba-Cu-O (RE=Sm, Nd) Superconductors for Quasi-Permanent Magnets 査読有り

H. Ikuta, T. Hosokawa, H. Ishihara, M. Yoshikawa, Y. Yanagi, Y. Itoh, T. Oka, and U. Mizutani

IEEE Trans. Appl. Superconduct. 11 巻頁： 3716 2001年

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）

The microstructures of melt-processed NdBCO/Ag samples were investigated. A rather homogeneous distribution of Nd422 particles was found, which can be attributed to the fast growing speed of NdBCO and the large size of Nd422 particles. The dispersion of Ag depended on the content of Ag_2_O, and the phase relation of the NdBCO/Ag system is discussed. We also studied the pulsed field magnetization technique, and found that the amount of magnetic fluxes trapped by SmBCO significantly increased by sandwiching the sample with ferromagnetic yokes and repeatedly applying magnetic pulses with decreasing the amplitude.

Preparation of YBa_2_Cu_3_O_7-y_ Thin Films by Chemical Solution Deposition Method on CeO_2_ and Y_2_O_3_ Buffer Layers 査読有り

H. Hiei, U. Mizutani, H. Ikuta, K. Yamagiwa, Y. Takahashi, S. B. Kim, I. Hirabayashi, J. Shibata, T. Hirayama

Ceramic Transactions 112 巻頁： 287-292 2001年

Growth and Thermoelectric Properties of CoO_2_-Based Whiskers

R. Funahashi, I. Matsubara, H. Ikuta, T. Takeuchi, U. Mizutani

Proceedings of the Sixth European Workshop on Thermoelectrics of the European Thermoelectric Society 頁： 36-39 2001年

Synthesis and Thermoelectric Properties of Co-Based Oxide Whiskers

R. Funahashi, I. Matsubara, H. Ikuta, T. Takeuchi, U. Mizutani

Proceedings of the 20th International Conference on Thermoelectrics 頁： 180-183 2001年

Melt-Processing of High-Performance RE-Ba-Cu-O/Ag (RE=Sm, Nd) Bulk-Superconductors

H. Ikuta

Proceedings of the 4^th^ Japan-Central Europe Joint Workshop on Energy and Information in Non-Linear Systems 頁： 190-193 2001年

Epitaxial growth of REBa_2_Cu_3_O_7-y_ films on various substrates by chemical solution deposition 査読有り

K. Yamagiwa, T. Araki, Y. Takahashi, H. Hiei, S. B. Kim, K. Matsumoto, J. Shibata, T. Hirayama, H. Ikuta, U. Mizutani, I. Hirabayashi

Journal of Crystal Growth 229 巻頁： 353-357 2001年

The Effects of Process Conditions on YBa_2_Cu_3_O_7-x_ Films by Metalorganic Deposition (MOD) Method using Trifluoroacetates 査読有り

T. Araki, K. Yamagiwa, Y. Takahashi, S. B. Kim, I. Hirabayashi, H. Hiei, U. Mizutani, H. Ikuta

Ceramic Transactions 112 巻頁： 293-298 2001年

Construction of a 2-5 T class superconducting magnetic fieldgenerator with use of an Sm123 bulk superconductor and its application to high-magnetic field demanding devices 査読有り

T. Oka, Y. Itoh, Y. Yanagi, M. Yoshikawa, H. Ikuta, and U. Mizutani

Physica C 335 巻頁： 101 2000年

La422相の強磁性

平林泉、山田容士、野崎洋、生田博志、水谷宇一郎

固体物理 35 巻頁： 121 2000年

Pulse Field Magnetization of Melt-Processed Sm-Ba-Cu-O 査読有り

H. Ikuta, H. Ishihara, T. Hosokawa, Y. Yanagi, Y. Itoh, M. Yoshikawa, T. Oka, and U. Mizutani

Supercond. Sci. Technol. 13 巻頁： 846 2000年

Preparation of bi-axially aligned YBa_2_Cu_3_O_7-d_ film on CeO_2_ buffered MgO by chemical solution deposition 査読有り

K. Yamagiwa, H. Hiei, Y. Takahashi, S. B. Kim, K. Matsumoto, H. Ikuta, U. Mizutani, and I. Hirabayashi

Physica C 334 巻頁： 301 2000年

Mechanical Properties of Sm-Ba-Cu-O/Ag Bulk Superconductors 査読有り

N. Sakai, A. Mase, H. Ikuta, S-J. Seo, U. Mizutani, and M. Murakami

Supercond. Sci. Technol. 13 巻頁： 770 2000年

Application of the Superconducting Permanent Magnets Driven by Static and Pulsed Magnetic Fields 査読有り

U. Mizutani, H. Ikuta, T. Hosokawa, H. Ishihara, K. Tazoe, T. Oka, Y. Itoh, Y. Yanagi, and M. Yoshikawa

Supercond. Sci. Technol. 13 巻頁： 836 2000年

Synthesis of c-axis-oriented Sm123 superconductors and their performance as superconducting permanent magnets 査読有り

U. Mizutani, A. Mase, K. Tazoe, H. Ikuta, T. Oka, Y. Itoh, Y. Yanagi, and M. Yoshikawa

Physica C 335 巻頁： 92 2000年

Relationship between the Temperature-Dependent Specific Heat of Regenerator Materials and Performance of a Gifford-McMahon Refrigerator

T. Biwa, S. Sunahara, H. Ikuta, and U. Mizutani

Proceedings of the Sixth Joint Japanese-Sino Seminar on Cryocooler and its Applications 頁： 131 2000年

Trapped Field Distribution on Sm-Ba-Cu-O Bulk Superconductor by Pulsed-Field Magnetization 査読有り

Y. Yanagi, Y. Itoh, M. Yoshikawa, T. Oka, T. Hosokawa, H. Ishihara, H. Ikuta, and U. Mizutani

Advances in Superconductivity 12 巻頁： 470 2000年

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