MONOCLINIC PHASE-TRANSFORMATION AND RELATED (100)TWINNING IN BI2SR2CACU2OY SINGLE-CRYSTALS

Authors
SHANG P YANG G JONES IP GOUGH CE ABELL JS
Citation
P. Shang et al., MONOCLINIC PHASE-TRANSFORMATION AND RELATED (100)TWINNING IN BI2SR2CACU2OY SINGLE-CRYSTALS, Physica. C, Superconductivity, 235, 1994, pp. 533-534
Citations number
5
Categorie Soggetti
Physics, Applied
Journal title
Physica. C, Superconductivity → ACNP
ISSN journal
09214534
Volume
235
Year of publication
1994
Part
1
Pages
533 - 534
Database
ISI
SICI code
0921-4534(1994)235:<533:MPAR(I>2.0.ZU;2-3
Abstract
An orthorhombic to monoclinic phase transformation with associated (10 0) twinning has been observed by transmission electron microscopy (TEM ) in Bi2Sr2CaCu2Oy single crystals after vacuum heating to between 350 degrees C and 400 degrees C. A model describing the monoclime structu re and the twin boundary geometrical configuration is presented. The o rthorhombic to monoclinic phase transformation and related (100) twinn ing are all reversible and depend strongly on the oxygen content. An e volution of a tweed-like image to (100) twinning is observed in Bi2Sr2 CaCu2Oy crystals as temperature and time increase. We propose that the monoclinic phase transformation results hom the ordering of oxygen va cancies in the CuO2 planes.