Dielectric relaxation in tetragonal tungsten bronze ceramics

被引：50

作者：

Hornebecq, V

Elissalde, C

Porokhonskyy, V

Bovtun, V

Petzelt, J

Gregora, I

Maglione, M

Ravez, J

机构：

[1] CNRS, ICMCB, F-33608 Pessac, France

[2] Acad Sci Czech Republ, Inst Phys, Prague 18221 8, Czech Republic

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2003年 / 64卷 / 03期

关键词：

ceramics; oxides; Raman spectroscopy; dielectric properties; ferroelectricity;

D O I：

10.1016/S0022-3697(02)00342-6

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Ferroelectric tantalates with the tetragonal tungsten bronze (TTB) type structure were studied over a wide frequency range from 10(2) to 10(9) Hz. Complementary microwave measurements at 36 GHz and micro-Raman experiments were performed in order to extend the dielectric study. A high frequency relaxation was observed above 10(8) Hz and fitted to the Cole-Cole formula. Different qualitative models are proposed to explain the understanding of the origin of the high frequency relaxation in ferroelectrics. Among these, polar clusters of ferroelectric active off-centred Ta5+ ions are considered. (C) 2002 Elsevier Science Ltd. All rights reserved.

引用

页码：471 / 476

页数：6