INFLUENCE OF TEMPERATURE ON THE LOW-FREQUENCY AND HIGH-FREQUENCY RELAXATION IN A TTB-TYPE FERROELECTRIC RELAXOR PB2K(NB0.1TA0.9)(5)O-15

Authors
LU Z BONNET JP RAVEZ J HAGENMULLER P
Citation
Z. Lu et al., INFLUENCE OF TEMPERATURE ON THE LOW-FREQUENCY AND HIGH-FREQUENCY RELAXATION IN A TTB-TYPE FERROELECTRIC RELAXOR PB2K(NB0.1TA0.9)(5)O-15, Journal of Materials Science, 30(22), 1995, pp. 5819-5824
Citations number
23
Categorie Soggetti
Material Science
Journal title
Journal of Materials Science → ACNP
ISSN journal
00222461
Volume
30
Issue
22
Year of publication
1995
Pages
5819 - 5824
Database
ISI
SICI code
0022-2461(1995)30:22<5819:IOTOTL>2.0.ZU;2-9
Abstract
Dielectric measurements on Pb2K(Nb0.1Ta0.9)(5)O-15 ceramics have been reported at 140 < T < 530 K in the 20-10(9) Hz frequency range. The te tragonal tungsten bronze-type (TTB) material shows a typical ferroelec tric relaxer behaviour. Three dielectric dispersions are observed. The relaxer behaviour results from a thermally activated relaxation with a large time distribution. This relaxation could be interpreted in ter ms of a polar microdomain concept. The two other dielectric dispersion s result from a space charge effect and from a relaxation probably rel ated to the TTB structure.