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Effect of Oxygen Partial Pressure on Stability of High-Tc Phase in Sintered Bi-Pb-Sr-Ca-Cu-O Superconductos

Published online by Cambridge University Press:  28 February 2011

H.K. Lee ,
K.W. Lee ,
D.H. Ha  and
J.C. Park
H.K. Lee
Affiliation:
Korea Standards Research Institute, P.O.Box 3, Taedok Science Town, Taejon, 305–606, Korea
K.W. Lee
Affiliation:
Korea Standards Research Institute, P.O.Box 3, Taedok Science Town, Taejon, 305–606, Korea
D.H. Ha
Affiliation:
Korea Standards Research Institute, P.O.Box 3, Taedok Science Town, Taejon, 305–606, Korea
J.C. Park
Affiliation:
Korea Standards Research Institute, P.O.Box 3, Taedok Science Town, Taejon, 305–606, Korea
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Abstract

The effect of oxygen partial pressure on stability of high-Tc phase in Bi-Pb-Sr-Ca-Cu-O system has been investigated using x-ray diffraction, resistivity and a.c. susceptibility measurements. It was found that part of the high-Tc phase in Bi-Pb-Sr-Ca-Cu-O system was transformed into the low-Tc phase (80 K) and insulating phases by heating in the temperature range 600 C to 880°C in O2 of one atmosphere. The original high-Tc phase was restored upon retreatment in a low oxygen partial pressure of 0.1 atmosphere. The reversible superconducting phase transformation is discussed in conjunction with the formation mechanism of the high-Tc phase in Bi-Pb-Sr-Ca-Cu-O system.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 169: Symposium M – High Temperature Superconductors: Fundamental Properties and Novel Materials Processing , 1989 , 349
Copyright
Copyright © Materials Research Society 1990

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