Modelling the microwave dielectric response of 'normal' ferroelectrics

被引：3

作者：

Guerra, J. de Los S. ^{[1
]}

Bassora, L. A. ^{[1
]}

Eiras, J. A. ^{[1
]}

机构：

[1] Univ Fed Sao Carlos, UFSCar, Dept Fis, Grp Ceram Ferroeletr, BR-13565905 Sao Carlos, SP, Brazil

来源：

SOLID STATE COMMUNICATIONS | 2006年 / 140卷 / 9-10期

基金：

巴西圣保罗研究基金会;

关键词：

ferroelectrics; dielectric properties; dielectric relaxation; microwave;

D O I：

10.1016/j.ssc.2006.09.014

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Ferroelectric materials present a dielectric dispersion in the frequency range of 0.1-1 GHz, which has been attributed to either a relaxation or a resonance process. However, the results reported in the literature have not been conclusive enough to distinguish clearly each process. In this work, the dielectric response of La-modified lead titanate ferroelectric ceramics were carefully investigated in both unpoled and poled state in the frequency range of 0.05-1 GHz. The results revealed clearly that the dielectric dispersion is highly anisotropic and can be associated with an overdamped process (relaxation-like) or a damped resonance process, which depends on the measuring direction. It was found that the dielectric dispersion can be modelled as a resonance process, which is either damped or overdamped when the ferroelectric or the ferroelastic contribution prevails. (c) 2006 Elsevier Ltd. All rights reserved.

引用

页码：426 / 429

页数：4

共 19 条

[1] POSSIBLE SPECIES OF FERROMAGNETIC, FERROELECTRIC, AND FERROELASTIC CRYSTALS [J].