| 不同La掺杂浓度的BiFeO_3的结构性质的显微拉曼光谱研究 |
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| 引用本文： | 杨洋,张丽艳,朱恪,马树元,刘玉龙.不同La掺杂浓度的BiFeO_3的结构性质的显微拉曼光谱研究[J].光散射学报,2010,22(2):147-150. |
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| 作者姓名： | 杨洋 张丽艳 朱恪 马树元 刘玉龙 |
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| 作者单位： | 1. 中国科学院物理研究所,北京,100190
2. 广西大学物理科学与技术学院,南宁,530004 |
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| 摘 要： | 使用显微拉曼散射技术研究不同的La掺杂浓度对BiFeO3(Bi1-xLaxFeO3,x=0,0.1,0.2,0.3,0.6,0.8和1.0)的结构性质的影响。拉曼光谱的变化证明了在Bi1-xLaxFeO3中,随着La含量的增加,其结构从三方相变成正交相。引人注目的是,位于610 cm-1附近的拉曼峰和它的二阶峰依然存在,并且随着La掺杂量的增加发生明显的增强。这一现象与BiFeO3在三方相结构存在的螺旋自旋结构被破坏有关。我们的实验证实了在Bi1-xLaxFeO3材料中存在着强烈的自旋-声子相互作用,这对于理解Bi1-xLaxFeO3材料的结构与物性之间的关系提供有用的信息。
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| 关 键 词： | 拉曼光谱 La-掺杂 Bi1-xLaxFeO3 相变 |
| 收稿时间： | 2009/5/30 |
Effects of La-Doping on the Structure of BiFeO3 Studied by Micro-Raman Scattering |
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| YANG Yang,ZHANG Li-yan,ZHU Ke,MA Shu-yuan,LIU Yu-long.Effects of La-Doping on the Structure of BiFeO3 Studied by Micro-Raman Scattering[J].Chinese Journal of Light Scattering,2010,22(2):147-150. |
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| Authors: | YANG Yang ZHANG Li-yan ZHU Ke MA Shu-yuan LIU Yu-long |
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| Abstract: | La-doped BiFeO3(Bi1-xLaxFeO3,x=0,0.1,0.2,0.3,0.6,0.8 and 1.0) were studied by using micro-Raman spectroscopy.The distinct changes in the Raman spectra indicated that the structure of Bi1-xLaxFeO3 changes from the rhombohedral BiFeO3 to the orthorhombic LaFeO3.Strikingly,the phonon peak at around 610 cm-1 and its corresponding two-phonon peak existed in all compounds and were enhanced with increasing La-substitution.Such phenomena were associated with breakdown of the cycloid spin configuration in the rhombohedral BiFeO3.Our results indicate the existence of strong spin-phonon coupling in Bi1-xLaxFeO3,which may provide useful information for understanding the correlation between the structural and magnetic properties of Bi1-xLaxFeO3. |
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| Keywords: | Bi1-xLaxFeO3 |
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