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

doi:10.2497/jjspm.39.783

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

Faculty of Engineering

Research output: Contribution to journal › Article › peer-review

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 Bi_0.9Pb_0.2Sr_1.0Ba_xCa_1.0Cu_1.6O_z (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 language	English
Pages (from-to)	783-786
Number of pages	4
Journal	Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume	39
Issue number	9
DOIs	https://doi.org/10.2497/jjspm.39.783
Publication status	Published - 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

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

In: Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy, Vol. 39, No. 9, 1992, p. 783-786.

Research output: Contribution to journal › Article › peer-review

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, vol. 39, no. 9, pp. 783-786. https://doi.org/10.2497/jjspm.39.783

Kobayashi, Naoya ; Morikawa, Keiichi ; Kanai, Masataka ; Shimizu, Kazutoyo ; Kusano, Yoshihiro ; Yamaguchi, Kazuhiro ; Fukuhara, Minoru ; Doi, Akira ; Takada, Toshio ; Takada, Jun ; Ikeda, Yasunori ; Takano, Mikio. / 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. In: Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy. 1992 ; Vol. 39, No. 9. pp. 783-786.

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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.",

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AU - Kanai, Masataka

AU - Shimizu, Kazutoyo

AU - Kusano, Yoshihiro

AU - Yamaguchi, Kazuhiro

AU - Fukuhara, Minoru

AU - Doi, Akira

AU - Takada, Toshio

AU - Takada, Jun

AU - Ikeda, Yasunori

AU - Takano, Mikio

PY - 1992

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N2 - 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.

AB - 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.

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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

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