Chemical and Mechanical Stability of the High-Tc Phase in the Bi-Pb-Sr-Ca-Cu-O System (II)-Effect of Annealing Atmosphare on Tc

Naoya Kobayashi, Keiichi Morikawa, Masataka Kanai, Kazutoyo Shimizu, Yoshihiro Kusano, Kazuhiro Yamaguchi, Minoru Fukuhara, Akira Doi, Toshio Takada, Jun Takada, Yasunori Ikeda, Mikio Takano

Research output: Contribution to journalArticle

Abstract

Effect of annealing atmosphere and temperature on the superconducting properties Tchave been discussed in the high-Tc phase in the Bi-Pb-Sr-Ca-Cu-O system. Special attention has been given to oxygen sorption/desorption and formation of impurity phases. The bulk samples without presence of amorphous phase formed due to mechanical grinding were used for compositions of Bi0.9Pb0.2Sr1.0BaxCa1.0Cu1.6Oz (x=0 and 0.05). Annealing in O2 and air above 700»C leads to marked weight increase and formation of (Bi,Pb)3Sr2Ca2CuO2. In contrast,almost monophasic samples of the high-Tc phase,absent from any impurity phases,were obtained on annealing in Ar. Furthermore,the weight of samples with x=0 and 0.05 decreses by Ar-annealing at temperatures of 350»C and 800-830»C. The weight decrease due to oxygen-desorption results inan elongation of the c-axis length of the high-Tc phase,accompanying an increase in Tc.

Original languageEnglish
Pages (from-to)783-786
Number of pages4
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume39
Issue number9
DOIs
Publication statusPublished - 1992

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry

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    Kobayashi, N., Morikawa, K., Kanai, M., Shimizu, K., Kusano, Y., Yamaguchi, K., Fukuhara, M., Doi, A., Takada, T., Takada, J., Ikeda, Y., & Takano, M. (1992). Chemical and Mechanical Stability of the High-Tc Phase in the Bi-Pb-Sr-Ca-Cu-O System (II)-Effect of Annealing Atmosphare on Tc. Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy, 39(9), 783-786. https://doi.org/10.2497/jjspm.39.783