Preparation of Bi-Pb-Sr-Ca-Cu-O high-TC superconductor from coprecipitated oxalate
| Autor: | Yoshio Oka, Hiromasa Mazaki, Jun Takada, Yoshinari Miura, Yasuo Takeda, Yoichi Tomii, Hitoshi Kitaguchi, Akiyoshi Osaka, Teruyoshi Unesaki, Mikio Takano, Yasunori Ikeda, Yoshichika Bando, Kiichi Oda, Naoichi Yamamoto |
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| Rok vydání: | 1988 |
| Předmět: |
Superconductivity
Materials science Mechanical Engineering Metals and Alloys Analytical chemistry Mineralogy Industrial and Manufacturing Engineering Oxalate chemistry.chemical_compound Volume (thermodynamics) chemistry Electrical resistance and conductance Meissner effect Phase (matter) Volume fraction Materials Chemistry Diamagnetism |
| Zdroj: | Journal of the Japan Society of Powder and Powder Metallurgy. 35:424-427 |
| ISSN: | 1880-9014 0532-8799 |
| DOI: | 10.2497/jjspm.35.424 |
| Popis: | Partial substitution of Pb for Bi in the Bi-Sr-Ca-Cu-O system has been found to increase sharply the volume fraction of the high-Tc phase when both the starting materials, coprecipitated oxalate being used in the present study, and the heating process are appropriate. The sharp powder X-ray diffraction pattern of the high-Tc phase was obtained from well-grown particles, 1020μm wide and 0.5μm thick typically. The electrical resistance dropped to zero at 107K within the experimental limit of 10-6Ω. A large diamagnetic response in the ac susceptibility due to the Meissner effect was seen below 120K. The fraction of the high-Tc phase over the low-Tc phase was roughly estimated to be 9/1 in volume. |
| Databáze: | OpenAIRE |
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