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。
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.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
1996年第1期1-6,共6页
Spectroscopy and Spectral Analysis
关键词
拉曼散射
钛酸钡
铈
BaTiO_3, BaTiO_3: Ce, Raman scattering
