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Synthesis and properties of Sr-free Bi cuprate superconductors |
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| Authors: | F. Munakata T. Kawano Y. Inoue H. Yamauchi |
| Affiliation: | 1. Superconductivity Research Laboratory , International Superconductivity Technology Center , 10-13 Shinonome 1-Chome, Koto-ku, Tokyo, 135, Japan;2. Central Engineering Laboratories , Nissan Motor Co. Ltd. , 1 Natsushima-cho, Yokosuka, Kanagawa, 237, Japan;3. Frontier Technology Research Institute, Tokyo Gas Co. Ltd. , 7-7, Suehiro-cho, 1-Chome, Tsurumi-ku, Yokohama, Kanagawa, 237, Japan;4. Central Engineering Laboratories , Nissan Motor Co. Ltd. , 1 Natsushima-cho, Yokosuka, Kanagawa, 237, Japan;5. Superconductivity Research Laboratory , International Superconductivity Technology Center , 10-13 Shinonome 1-Chome, Koto-ku, Tokyo, 135, Japan |
| Abstract: | Both the oxygen content and Tonset c of the Bi2Ca2.5(Ln, Ln+)0.5Cu2O y system monotonically increases as the mean ionic radius of (Ln, Ln+) increases. The structural modulations in all of the samples are almost commensurate with a period equal to 9b. In Bi2-xPbCa2.5Nd0.5Cu2O y , Tonset c decreases with increasing Pb concentration. In order to investigate the effect of post annealing using a hot isostatic press (HIP), Bi2Ca2.5La0.25Pr0.25Cu2O y was processed under different HIP conditions. This result suggested that HIP annealing causes a phase change from the 232 structure to the 221 structure. |
| Keywords: | Bi-232 superconductor Sr-free Bi cuprate oxygen nonstoichiometry effect structural modulation Pb substitution effect HIP-annealing |