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Thermodynamic stability and superconductivity of the Bi–Sr–Ca(Y)–Cu–Li–O system

Published online by Cambridge University Press:  31 January 2011

Chen Xianhui ,
Lin Chun ,
Lu Bin ,
Qian Yitai ,
Cao Liezhao ,
Chen Zhaojia  and
Chen Zuyao
Chen Xianhui
Affiliation:
Department of Physics, University of Science & Technology of China (USTC), Hefei, Anhui 230026, People's Republic of China
Lin Chun
Affiliation:
Department of Applied Chemistry, University of Science & Technology of China (USTC), Hefei, Anhui 230026, People's Republic of China
Lu Bin
Affiliation:
Structure Research Laboratory, University of Science & Technology of China (USTC), Hefei, Anhui 230026, People's Republic of China
Qian Yitai
Affiliation:
Department of Applied Chemistry, University of Science & Technology of China (USTC), Hefei, Anhui 230026, People's Republic of China
Cao Liezhao
Affiliation:
Department of Physics, University of Science & Technology of China (USTC), Hefei, Anhui 230026, People's Republic of China
Chen Zhaojia
Affiliation:
Department of Physics, University of Science & Technology of China (USTC), Hefei, Anhui 230026, People's Republic of China
Chen Zuyao
Affiliation:
Department of Applied Chemistry, University of Science & Technology of China (USTC), Hefei, Anhui 230026, People's Republic of China
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Abstract

In order to understand the effects of the thermodynamic stability on superconductivity, the thermodynamic stability of the Bi2Sr2CaCu2-xLixOy system and the Bi2Sr2YCu2-xLixOy system was studied. It is found that the broad ranges (0 ≤ x ≤ 0.6) of solid solution may be thermodynamically stable at high temperatures for the Bi2Sr2CaCu2-xLixOy), system and the Bi2Sr2YCu2-xLixOy), system. At equilibrium at low temperatures, however, solid solubility is eliminated, and only the end member compounds and possibly intermediate compounds of fixed composition remain for 0.3 ≤ x ≤ 0.6. It suggests that Li can destroy the thermodynamic stability. Superconductivity is improved by Li-doping, which may be related to the thermodynamic instability.

Type
Articles
Information
Journal of Materials Research , Volume 8 , Issue 7 , July 1993 , pp. 1510 - 1514
Copyright
Copyright © Materials Research Society 1993

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References

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