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 language | English |
|---|---|
| Pages (from-to) | 783-786 |
| Number of pages | 4 |
| Journal | journal of the japan society of powder and powder metallurgy |
| Volume | 39 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - 1991 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Mechanical Engineering
- Metals and Alloys
- Industrial and Manufacturing Engineering
- Materials Chemistry
Cite this
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: journal of the japan society of powder and powder metallurgy, Vol. 39, No. 9, 1991, p. 783-786.Research output: Contribution to journal › Article
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TY - JOUR
T1 - 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
AU - Kobayashi, Naoya
AU - Morikawa, Keiichi
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 - 1991
Y1 - 1991
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.
UR - http://www.scopus.com/inward/record.url?scp=85004387242&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85004387242&partnerID=8YFLogxK
U2 - 10.2497/jjspm.39.783
DO - 10.2497/jjspm.39.783
M3 - Article
AN - SCOPUS:85004387242
VL - 39
SP - 783
EP - 786
JO - Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
JF - Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
SN - 0532-8799
IS - 9
ER -