| Ba_(1-x)Sr_xTiO_3相结构的拉曼光谱研究 |
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| 引用本文： | 郭惠芬,张兴堂,武超,郭浩,李蕴才,黄亚彬,杜祖亮.Ba_(1-x)Sr_xTiO_3相结构的拉曼光谱研究[J].光散射学报,2003,15(2):105-109. |
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| 作者姓名： | 郭惠芬 张兴堂 武超 郭浩 李蕴才 黄亚彬 杜祖亮 |
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| 作者单位： | 河南大学特种功能材料重点实验室,河南开封,475001 |
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| 基金项目： | 国家自然科学基金，29971008， |
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| 摘 要： | 本文测定了不同Sr含量的钛酸锶钡(Ba1-xSrxTiO3)纳米晶的拉曼光谱,发现了随着Sr含量的增加,517cm-1E(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。
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| 关 键 词： | Ba1-xSrxTiO3 光学声子模 相结构 |
| 文章编号： | 1004-5929(2003)02-0105-05 |
| 收稿时间： | 2003/3/4 |
| 修稿时间： | 2003年3月4日 |
Raman Study of Nanocrystal Ba1-xSrxTiO3 on Ferroelectric Phase Transition |
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| Abstract: | The nanocrystal Ba1-xSrxTiO3 system with various Srdoped concentrations has been investigated by Raman scattering. The result indicated that with the increasing of Sr dopant, the E(TO)and A1(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, Ba1-xSrxTiO3 transforms from a ferroelectric tetragonal phase to a paraelectric cubic phase. |
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| Keywords: | Ba_(1-x)Sr_xTiO_3 Optical phonon mode Phase structure |
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