Ba1-xSrxTiO3相结构的拉曼光谱研究

郭惠芬; 张兴堂; 武超; 郭浩; 李蕴才; 黄亚彬; 杜祖亮

光散射学报, 2003, 15 (2): 105, 网络出版: 2006-05-19

Ba_1-xSr_xTiO₃相结构的拉曼光谱研究

Raman Study of Nanocrystal Ba1-xSrxTiO3 on Ferroelectric Phase Transition

论文大纲

郭惠芬张兴堂武超郭浩李蕴才黄亚彬杜祖亮

作者单位

河南大学特种功能材料重点实验室,河南开封,475001

光学声子模相结构 Ba_1-xSr_xTiO₃ Ba1-xSrxTiO3 Optical phonon mode Phase structure

摘要

本文测定了不同Sr含量的钛酸锶钡(Ba_1-xSr_xTiO₃)纳米晶的拉曼光谱,发现了随着Sr含量的增加,517cm-1[E(TO)与A1(TO)]光学声子模劈裂为双峰和相对低频声子模向低频漂移,而相对高频声子模向高频漂移现象.当x=0.4时,软模解冻,Ba1-xSrxTiO3铁电相不能维持而呈现顺电相结构.

Abstract

The nanocrystal Ba_1-xSr_xTiO₃ system with various Srdoped concentrations has been investigated by Raman scattering. The result indicated that with the increasing of Sr dopant, the [E(TO)and A1(TO)] optical phonon peak at 517cm-1 splits into two peaks clearly and the lower frequency phonon mode shifts to the lower frequency, and the higher frequency phonon mode shifts to the higher frequency. At room temperature, as x=0.4, the soft mode is soften, Ba1-xSrxTiO3 transforms from a ferroelectric tetragonal phase to a paraelectric cubic phase.

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郭惠芬, 张兴堂, 武超, 郭浩, 李蕴才, 黄亚彬, 杜祖亮. Ba_1-xSr_xTiO₃相结构的拉曼光谱研究[J]. 光散射学报, 2003, 15(2): 105. 郭惠芬, 张兴堂, 武超, 郭浩, 李蕴才, 黄亚彬, 杜祖亮. Raman Study of Nanocrystal Ba1-xSrxTiO3 on Ferroelectric Phase Transition[J]. The Journal of Light Scattering, 2003, 15(2): 105.

Ba_1-xSr_xTiO₃相结构的拉曼光谱研究

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