TITLE

Orthorhombic-tetragonal phase transition in high-temperature superconductor YBa2Cu3O7

AUTHOR(S)
Eatough, M. O.; Ginley, D. S.; Morosin, B.; Venturini, E. L.
PUB. DATE
August 1987
SOURCE
Applied Physics Letters;8/3/1987, Vol. 51 Issue 5, p367
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We have determined the effect of elevated temperature on the crystal structure and lattice parameters of the single-phase high-temperature superconductor YBa2Cu3O7 using high-temperature x-ray powder diffractometry. This compound is orthorhombic below about 550 °C (depending on oxygen partial pressure) and transforms to a tetragonal polymorph at higher temperatures. The reversibility of this transition depends on the oxygen partial pressure. An oxygen ‘‘hopping’’ mechanism with possible oxygen loss, which appears consistent with the known structural details, is proposed for the transition.
ACCESSION #
9823725

 

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