Effect of oxygen partial pressure on the transformation between high T c and low T c phases in a Bi-Pb-Sr-Ca-Cu-O system
- 18 September 1989
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 55 (12) , 1249-1251
- https://doi.org/10.1063/1.102467
Abstract
The effect of oxygen partial pressure on the stability of the high Tc phase (>100 K) in a Bi‐Pb‐Sr‐Ca‐Cu‐O system has been studied using resistivity, x‐ray diffraction, and ac susceptibility measurements. It was observed that part of the high Tc phase formed by sintering at 840 °C in a low oxygen partial pressure of 1/10 atmosphere was transformed into a low Tc phase (∼80 K) and an insulating phase by heating at the same sintering temperature in O2 of one atmosphere. The original high Tc phase was restored upon retreatment at the same temperature in a low oxygen partial pressure of 1/10 atmosphere.Keywords
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