Chemical and Mechanical Stability of the Ba-added High-Tc Phase in the Bi-Pb-Sr-Ca-Cu-O System

Jun Takada; Kosei Fujisaka; Katsunori Hosotani; Toshio Egi; Yoshihiro Kusano; Tokuro Nanba; Yasunori Ikeda; Mikio Takano

doi:10.2497/jjspm.40.204

Chemical and Mechanical Stability of the Ba-added High-Tc Phase in the Bi-Pb-Sr-Ca-Cu-O System

Jun Takada, Kosei Fujisaka, Katsunori Hosotani, Toshio Egi, Yoshihiro Kusano, Tokuro Nanba, Yasunori Ikeda, Mikio Takano

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

Abstract

Chemical and mechanical stability of the Ba-added high-Tc phase has been studied using XRD and DTA for samples of Bi_0.9Pb_0.2Sr_1.0Ba_xCa_1.0Cu_1.6Oz with x=0 and 0.05. Some impurities were observed in all samples after the heat treatment at 300∼820°C. BaPb_0.75Bi_0.25O₃ was also formed in the Ba-added samples heated at 700∼800°C. These impurities were thought to be formed from the amorphous phase which was produced by mechanical grinding of the high-Tc phase. The impurities disappeared and an almost monophasic sample of the high-Tc phase was obtained by heating at 850°C. The lattice parameter c of the Ba-added high-Tc phase was longer than that of the Ba-free one above 800°C. The parameter c of the Ba-added sample heated at 850°C increased with an increase of heating time and was saturated over 48h. The increase of c was due to the Ba dissolution in the high-Tc phase.

Original language	English
Pages (from-to)	204-207
Number of pages	4
Journal	Journal of the Japan Society of Powder and Powder Metallurgy
Volume	40
Issue number	2
DOIs	https://doi.org/10.2497/jjspm.40.204
Publication status	Published - 1993

ASJC Scopus subject areas

Mechanical Engineering
Industrial and Manufacturing Engineering
Metals and Alloys
Materials Chemistry

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title = "Chemical and Mechanical Stability of the Ba-added High-Tc Phase in the Bi-Pb-Sr-Ca-Cu-O System",

abstract = "Chemical and mechanical stability of the Ba-added high-Tc phase has been studied using XRD and DTA for samples of Bi0.9Pb0.2Sr1.0BaxCa1.0Cu1.6Oz with x=0 and 0.05. Some impurities were observed in all samples after the heat treatment at 300∼820°C. BaPb0.75Bi0.25O3 was also formed in the Ba-added samples heated at 700∼800°C. These impurities were thought to be formed from the amorphous phase which was produced by mechanical grinding of the high-Tc phase. The impurities disappeared and an almost monophasic sample of the high-Tc phase was obtained by heating at 850°C. The lattice parameter c of the Ba-added high-Tc phase was longer than that of the Ba-free one above 800°C. The parameter c of the Ba-added sample heated at 850°C increased with an increase of heating time and was saturated over 48h. The increase of c was due to the Ba dissolution in the high-Tc phase.",

author = "Jun Takada and Kosei Fujisaka and Katsunori Hosotani and Toshio Egi and Yoshihiro Kusano and Tokuro Nanba and Yasunori Ikeda and Mikio Takano",

year = "1993",

doi = "10.2497/jjspm.40.204",

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journal = "Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy",

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T1 - Chemical and Mechanical Stability of the Ba-added High-Tc Phase in the Bi-Pb-Sr-Ca-Cu-O System

AU - Takada, Jun

AU - Fujisaka, Kosei

AU - Hosotani, Katsunori

AU - Egi, Toshio

AU - Kusano, Yoshihiro

AU - Nanba, Tokuro

AU - Ikeda, Yasunori

AU - Takano, Mikio

PY - 1993

Y1 - 1993

N2 - Chemical and mechanical stability of the Ba-added high-Tc phase has been studied using XRD and DTA for samples of Bi0.9Pb0.2Sr1.0BaxCa1.0Cu1.6Oz with x=0 and 0.05. Some impurities were observed in all samples after the heat treatment at 300∼820°C. BaPb0.75Bi0.25O3 was also formed in the Ba-added samples heated at 700∼800°C. These impurities were thought to be formed from the amorphous phase which was produced by mechanical grinding of the high-Tc phase. The impurities disappeared and an almost monophasic sample of the high-Tc phase was obtained by heating at 850°C. The lattice parameter c of the Ba-added high-Tc phase was longer than that of the Ba-free one above 800°C. The parameter c of the Ba-added sample heated at 850°C increased with an increase of heating time and was saturated over 48h. The increase of c was due to the Ba dissolution in the high-Tc phase.

AB - Chemical and mechanical stability of the Ba-added high-Tc phase has been studied using XRD and DTA for samples of Bi0.9Pb0.2Sr1.0BaxCa1.0Cu1.6Oz with x=0 and 0.05. Some impurities were observed in all samples after the heat treatment at 300∼820°C. BaPb0.75Bi0.25O3 was also formed in the Ba-added samples heated at 700∼800°C. These impurities were thought to be formed from the amorphous phase which was produced by mechanical grinding of the high-Tc phase. The impurities disappeared and an almost monophasic sample of the high-Tc phase was obtained by heating at 850°C. The lattice parameter c of the Ba-added high-Tc phase was longer than that of the Ba-free one above 800°C. The parameter c of the Ba-added sample heated at 850°C increased with an increase of heating time and was saturated over 48h. The increase of c was due to the Ba dissolution in the high-Tc phase.

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Chemical and Mechanical Stability of the Ba-added High-Tc Phase in the Bi-Pb-Sr-Ca-Cu-O System

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