Crystal structure refinement of La-0.683(Ti0.95Al0.05)O-3 perovskite by the Rietveld method

Authors
Ali, R Yashima, M Yoshimura, M Yoshioka, H
Citation
R. Ali et al., Crystal structure refinement of La-0.683(Ti0.95Al0.05)O-3 perovskite by the Rietveld method, J AM CERAM, 84(2), 2001, pp. 468-470
Citations number
10
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
ISSN journal
00027820 → ACNP
Volume
84
Issue
2
Year of publication
2001
Pages
468 - 470
Database
ISI
SICI code
0002-7820(200102)84:2<468:CSROLP>2.0.ZU;2-W
Abstract
The structural parameters of orthorhombic and tetragonal phases (space grou p Plmmm and p4/mmm) of A-site deficient La-0.683(Ti0.95Al0.05)O-3 pervoskit e have been refined by Rietveld analysis through the X-ray powder diffracti on patterns measured in the temperature range from 15 degrees to 500 degree sC. With an increase in temperature the unit-cell parameters a, b, and c in creased, while the b/a ratio decreased and became unity between 200 degrees and 400 degreesC. No significant changes were observed for atomic coordina tes throughout the temperature studied. These results strongly suggest that the phase transition is induced by lattice distortion.