CORRELATION BETWEEN LOW-FREQUENCY DIELECTRIC-DISPERSION (LFDD) AND IMPEDANCE RELAXATION IN FERROELECTRIC CERAMIC PB2KNB4TAO15

被引：92
作者：
LU, ZG
BONNET, JP
RAVEZ, J
HAGENMULLER, P
机构：
[1] Laboratoire de Chimie du Solide, CNRS, Université de Bordeaux I, 33405 Talence Cedex, 351, cours de la Libération
来源：
SOLID STATE IONICS | 1992年 / 57卷 / 3-4期
关键词：
D O I：
10.1016/0167-2738(92)90153-G
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
An impedance spectroscopy experiment has been carried out on a Pb2KNb4TaO15 ceramic sample of tetragonal tungsten bronze-type structure (T(c) = 643 K) from 300 to 900 K in the 20-3 x 10(5) Hz frequency range. A low frequency dielectric dispersion (LFDD) has been found. An impedance relaxation occurs simultaneously. A model is proposed to account for the observed phenomena. An empirical impedance expression has been deduced: Z* = R0/ (1 +iomega/omega1 + (iomega/omega2)n) where omega1 and omega2 characterize respectively the lattice response and the "universal behavior" of the charge carriers. This formula may be considered as generalizing the ideal Debye and non-ideal Cole-Cole expressions. Various dielectric dispersion relations are also obtained. An excellent fitting has been obtained for the dielectric constant spectrum in the 570-780 K temperature range. The ajustable parameters A and n of the "universal law" A (iomega)1-n are accurately determined and discussed. A shows a prominent peak in the paraelectric-ferroelectric transition region, while n exhibits a linear temperature dependence in both ferroelectric and paraelectric phases. At T(c) a minimum is observed for n.
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页码：235 / 244
页数：10
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