LOCAL STRUCTURAL DISTORTIONS BELOW AND ABOVE THE ANTIFERRODISTORTIVE PHASE-TRANSITION

Authors
RECHAV B YACOBY Y STERN EA REHR JJ NEWVILLE M
Citation
B. Rechav et al., LOCAL STRUCTURAL DISTORTIONS BELOW AND ABOVE THE ANTIFERRODISTORTIVE PHASE-TRANSITION, Physical review letters, 72(9), 1994, pp. 1352-1355
Citations number
24
Categorie Soggetti
Physics
Journal title
Physical review letters → ACNP
ISSN journal
00319007
Volume
72
Issue
9
Year of publication
1994
Pages
1352 - 1355
Database
ISI
SICI code
0031-9007(1994)72:9<1352:LSDBAA>2.0.ZU;2-M
Abstract
Quantitative measurements of oxygen octahedra local rotation angles ar e reported for the antiferrodistortive type perovskites, Na0.82K0.18Ta O3 and NaTaO3. The results were obtained using a detailed analysis of x-ray absorption fine structure spectra. These results show that the o xygen octahedra rotation angle at the peak of the rotation angle distr ibution function of an antiferrodistortive crystal is nonzero and larg e, hundreds of degrees above the transition temperature.