DIELECTRIC AND RAMAN-STUDY OF SHORT AND LONG-RANGE ORDER IN KTN

被引：1

作者：

DIANTONIO, P ^{[1
]}

WANG, XM ^{[1
]}

TOULOUSE, J ^{[1
]}

BOATNER, LA ^{[1
]}

机构：

[1] OAK RIDGE NATL LAB,OAK RIDGE,TN 37831

来源：

FERROELECTRICS | 1991年 / 120卷 / 1-2期

关键词：

DIELECTRIC CONSTANT; RAMAN SCATTERING; MIXED FERROELECTRICS; POLAR CLUSTERS;

D O I：

10.1080/00150199108216806

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In the mixed perovskite ferroelectric KTa1-xNbxO3 (KTN), the nature of the observed phase transitions changes with varying Nb concentration, x. We have studied the phase transitions in KTN for two significantly different concentrations (15.7% and 1.2% Nb) by means of dielectric constant and Raman measurements. The appearance of the first-order TO2 and TO3 Raman lines reveals lattice distortions occurring at temperatures Tcl and Tc2 respectively. The symmetry change caused by these distortions, as well as their spatial extent, is shown to depend on the niobium concentration. © 1991, Taylor & Francis Group, LLC. All rights reserved.

引用

页码：107 / 112

页数：6

共 17 条

[1] LINEAR DISORDER IN CRYSTALS (SILICON, QUARTZ AND FERROELECTRIC PEROVSKITES) [J].