铁电体Ba_xPb_（1－x）TiO_3系列高压Raman光谱及压致软模相变的研究

Study of Raman Spectra and Soft Mode Phase Transition under High Pressure in Ferroelectrics Ba_xPb_(1-x)TiO_3

本文研究了铁电体系列催化剂Ｂａｘｐｂ１－ｘＴｉＯ３在常温常压及常温高压下的Ｒａｍａｎ光谱和压力感应软模相变．对含钡量（Ｘ值）不同的几种（Ｘ＝０，Ｘ＝０．２，Ｘ＝０．Ｘ＝０．６，Ｘ＝１．０）样品的Ｒａｍａｎ光谱散射峰对应的声子频率随压力的变化的分析表明，ＢａｘＰｂ１－ｘＴｉＯ３晶体的相变压力点（Ｐｃ值），随晶体中Ｂａ组分含量的增加而减小．这主要是指晶体的软模Ｅ（ＩＴＯ）］频率随压力的变化．同时，发现晶体相变后，其软模对应声子的频率又随压力升高而升高的现象及其他振动模态并不消失的情况．这说明，正是由于样品中钡组分含量的增加和压力的双重因素使晶体出现了晶格畸变．

In this paper, the high pressure Raman spectra of the Ferroelectrics BaxPb1-xTiO3 (x=0.0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.9, 1.0) have been studied. The changes of the optics modes have been measured in freguency and the pressure points of the Pressure-induced soft phase fransition in BaxPb1-xTiO3 with different content χ have been obtained.