| BaTiO3和Ce:BaTiO3晶体极性声子和电磁激元的喇曼散射研究 |
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| 引用本文： | 曾令祉,王荣平,蒋毅坚,朱镛,刘玉龙.BaTiO3和Ce:BaTiO3晶体极性声子和电磁激元的喇曼散射研究[J].物理学报,1996,45(6):1059-1067. |
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| 作者姓名： | 曾令祉 王荣平 蒋毅坚 朱镛 刘玉龙 |
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| 作者单位： | (1)北京工业大学应用物理系,北京100022; (2)中国科学院物理研究所,北京100080 |
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| 基金项目： | 国家自然科学基金;北京市自然科学基金;北京市科技新星计划资助的课题 |
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| 摘 要： | 从声子-电磁激元频率色散关系的普遍公式出发,推导出了单轴晶体的Merten方程和电磁激元的频率色散关系。测量了BaTiO3和Ce:BaTiO3晶体的简正模和斜声子的喇曼散射谱,并根据Merten方程,拟合出了斜声子的方向色散曲线;记录了A1类电磁激元在不同波矢值下的喇曼谱,观察到其频率色散现象.根据以上结果,对A1(TO)模喇曼谱中两个宽的非对称峰的归属和BaTiO3晶体的结构相变机制进行了讨论;计算出了这两种晶体的受夹介电常数;分析了掺Ce对BaTiO3晶体结构的影响。
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| 关 键 词： | 单轴 晶体 钛酸钡 极性声子 电磁激光 |
| 收稿时间： | 1995-02-22 |
STUDY ON RAMAN SPECTRA OF POLAR-PHONONS AND POLARITONS IN BaTiO3 AND Ce:BaTiO3 SINGLE CRYSTALS |
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| ZENG LING-ZHI,WANG RONG-PING,JIANG YI-JIAN,ZHU YONG and LIU YU-LONG.STUDY ON RAMAN SPECTRA OF POLAR-PHONONS AND POLARITONS IN BaTiO3 AND Ce:BaTiO3 SINGLE CRYSTALS[J].Acta Physica Sinica,1996,45(6):1059-1067. |
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| Authors: | ZENG LING-ZHI WANG RONG-PING JIANG YI-JIAN ZHU YONG and LIU YU-LONG |
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| Abstract: | In this paper, the Merten' s equation and dispersion relation of polaritons in the uniaxial crystal had been deduced from the generalized dispersion relation of the phonon-polariton. Raman spectra of every LO, TO mode and oblique phonons in BaTiO3 and Ce: BaTiO3 single crystals have been recorded, the directional dispersion curves are fitted on the basis of Merten's equation. Raman spectra of A1 polaritons with different wave-vector q have been measured and the high and low frequency dielectric constants in both BaTiO3 and Ce:BaTiO3 are calculated. Two broad asymmetry bands in A1(TO) Raman spectra and the mechanics of structure phase transition in BaTiO3 are also discussed. The influence of Ce on the structure of BaTiO3 single crystal are analysed. |
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