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四方相BaTiO_3及BaTiO_3∶Ce的拉曼散射特性研究
引用本文:王瑞敏,赵铁男,刘竟青,朱恪,朱镛,吴星.四方相BaTiO_3及BaTiO_3∶Ce的拉曼散射特性研究[J].光谱学与光谱分析,1996(1).
作者姓名:王瑞敏  赵铁男  刘竟青  朱恪  朱镛  吴星
作者单位:中国科学院物理研究所,陕西师范大学物理系
摘    要:本文报道了在室温下BaTiO3及BaTiO3:Ce的拉曼谱的特点,着重讨论了前向散射配置下两个1I(TO)模(位于275cm-1和516cm-1左右)出现在A1(TO)谱中的原因。通过设计特别的前向散射实验得到了此配置下由于晶体出射面对入射光的反射造成的背向散射的强度。在BaTiO3的前向散射谱中扣除了背向散射信号后,两个宽峰基本减掉,而掺Ce后经同样扣除背向散射信号两宽峰却依然很强。这样便证明了它们在前向散射中的出现与杂质有关系。在BaTiO3扣除背向散射后的谱中,还首次观察到一个位于492cm-1的峰。掺Ce后晶体的吸收曲线有很大变化,本文还讨论了吸收对散射强度的影响。

关 键 词:BaTiO_3  BaTiO_3∶Ce,拉曼散射

STUDIES OF RAMAN SCATTERING FROM BaTiO_3 AND BaTiO_3:Ce IN THE TETRAGONAL PHASE
WANG Ruimin, ZHAO Tienan, LIU Jingqing, ZHU Ke, ZHU Yong and WU Xing.STUDIES OF RAMAN SCATTERING FROM BaTiO_3 AND BaTiO_3:Ce IN THE TETRAGONAL PHASE[J].Spectroscopy and Spectral Analysis,1996(1).
Authors:WANG Ruimin  ZHAO Tienan  LIU Jingqing  ZHU Ke  ZHU Yong and WU Xing
Abstract:In this work we report Raman spectra of BaTiO_3: Ce at room temperature and also those of BaTiO_3 for comparison. The possible reasons for the appearance of the twoA1 (TO) features at 275 and sl6cm-1 in the A1 (LO) spectrum measured under the forwardscattering configuration are discussed. In the special experiment designed by ourselves we obtained the backscattering signal excited by the laser light reflected by the sample's rear surfaces. For BaTiO-3, there are almost no more the two A1 (TO) features in the forward-scattering spectrum after subtracting the backscattering signal. But in the case of BaTiO3: Ce,those two features remain relatively strong. This comparison of the forward-scattering spectra between the two samples lets us to see the influence of Ce on Raman signals in BaTiO3.The absorption curve of Ce-doped BaTiO3 crystal changes a lot, and its influence on Ramanscattering intensities is also discussed.
Keywords:BaTiO_3  BaTiO_3: Ce  Raman scattering
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