High-pressure phase above 40 GPa in ferroelectric KNbO3

Authors
Kobayashi, Y Endo, S Ashida, T Ming, LC Kikegawa, T
Citation
Y. Kobayashi et al., High-pressure phase above 40 GPa in ferroelectric KNbO3, PHYS REV B, 61(9), 2000, pp. 5819-5822
Citations number
11
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICAL REVIEW B
ISSN journal
10980121 → ACNP
Volume
61
Issue
9
Year of publication
2000
Pages
5819 - 5822
Database
ISI
SICI code
1098-0121(20000301)61:9<5819:HPA4GI>2.0.ZU;2-B
Abstract
A ferroelectric KNbO3 of the barium titanate family has been investigated t o 69 GPa at room temperature by angle-dispersive powder diffraction using s ynchrotron radiation and an imaging plate. A phase transition was observed to take place at around 40 GPa, and the Rietveld analysis showed that the h igh-pressure phase has GdFeO3-type orthorhombic structure, which is also on e of the distorted perovskite structures.