Reaction Mechanism of High-Tc Phase (Tc=110 K) Formation in the Bi-Sr-Ca-Cu-O Superconductive System
- 1 November 1989
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 28 (11A) , L1918
- https://doi.org/10.1143/jjap.28.l1918
Abstract
The reaction mechanism to produce the high-T c phase was investigated using X-ray powder diffractometry and thermogravimetry and differential thermal analysis (TG-DTA). The high-T c phase was produced through the low-T c phase (Bi2Sr3-x Ca x Cu2O y , 1<xT c phase. In order to produce the high-T c phase, it is necessary that the melting point of the low-T c phase be lower than that of the high-T c phase. Increase of Ca content in the low-T c phase or decrease of ambient partial oxygen pressure during calcination are quite efficient to decrease the melting point of the low-T c phase, and hence to enhance the formation of the high-T c phase.Keywords
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