Ionic conductivity, ferroelectricity and chemical bonding in TKWB type ceramics of the K6Li4Ta10O30-Pb5Ta10O30 system

被引：7

作者：

Hornebecq, V ^{[1
]}

Reau, JM ^{[1
]}

Villesuzanne, A ^{[1
]}

Elissalde, C ^{[1
]}

Ravez, J ^{[1
]}

机构：

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

来源：

JOURNAL OF MATERIALS CHEMISTRY | 1998年 / 8卷 / 11期

关键词：

D O I：

10.1039/a803412e

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：

Correlations between Curie temperature and chemical bonding were found in ferroelectric tetragonal potassium tungsten bronze type ceramics [TKWB] using the extended Huckel tight-binding (EHTB) method. The influence of Pb for K,LI substitution is shown. AC complex impedance measurements were performed on ceramics with compositions corresponding to Pb5xK6(1-x)Li4(1-x)Ta10O30 (PKLT) in a wide temperature range. The conductivity relaxation parameters of Li+ conducting PKLT ceramics were determined. Transport properties in these materials appear to be due to a Li+ ion hopping mechanism. The influence of the substitution 6K(+) + 4Li(+) --> 5Pb(2+) on the mobility is discussed with the assistance of the results obtained from EHTB calculations.

引用

页码：2423 / 2428

页数：6

共 32 条

[1] THE ACTIVATION ENTROPY FOR TRANSPORT IN IONIC CONDUCTORS [J].