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Effect of Processing on the Structure, Oxygen Content, and Superconductivity of LaBa 2 Cu 3 O y
Author(s) -
Wu MaShine,
Fang TsangTse
Publication year - 1998
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1998.tb02526.x
Subject(s) - lanthanum , superconductivity , tetragonal crystal system , oxygen , orthorhombic crystal system , barium , materials science , anomaly (physics) , analytical chemistry (journal) , condensed matter physics , mineralogy , chemistry , crystallography , inorganic chemistry , crystal structure , physics , environmental chemistry , organic chemistry
We have examined the structure, oxygen content, and superconductivity of a LaBa 2 Cu 3 O y superconductor heat treated at different temperatures and in different atmospheres. It was found that the expansion of the c ‐axis, which was caused by the removal of oxygen, might be the reason for the ordering of barium and lanthanum ions when the specimen is heated in a reducing atmosphere. The anomaly in the expansion of the c ‐axis was also observed when oxygen was removed. Mechanisms of the orthorhombic‐tetragonal transition and the occurrence of the anomaly in the c ‐axis have been proposed.