Anomalous mode coupling and phase transition of KNbO3 under high pressure

Authors
Shamim, MM Ishidate, T
Citation
Mm. Shamim et T. Ishidate, Anomalous mode coupling and phase transition of KNbO3 under high pressure, SOL ST COMM, 113(12), 2000, pp. 713-717
Citations number
14
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
SOLID STATE COMMUNICATIONS
ISSN journal
00381098 → ACNP
Volume
113
Issue
12
Year of publication
2000
Pages
713 - 717
Database
ISI
SICI code
0038-1098(2000)113:12<713:AMCAPT>2.0.ZU;2-V
Abstract
Raman spectra of KNbO3 under high pressure have been analyzed on the basis of the two-mode coupling model. It has been found that the phase transition s from orthorhombic to tetragonal and from tetragonal to cubic occur at 7 a nd 8 GPa, respectively, accompanied by an abrupt jump of the mode width of one mode. The mode coupling occurs even in the cubic phase. (C) 2000 Elsevi er Science Ltd. All rights reserved.