近化学计量比钽酸锂晶体的拉曼光谱研究  

Study on Raman Spectrum of Near-stoichiometry Lithium Tantalate

作　　者：师丽红[1] 孔勇发[2] 阎文博[2] 刘宏德[2] 李晓春[2] 谢翔[2] 许京军[2] 孙军 陈绍林 张玲 孙磊[2] 赵迪[2] 张万林 张光寅[2] 

机构地区：[1]天津城市建设学院,天津300384 [2]南开大学弱光非线性光子学材料先进技术及制备教育部实验室,天津300457 [3]天津市信息光子材料与技术重点实验室,天津300457

出　　处：《人工晶体学报》2005年第6期1024-1029,共6页Journal of Synthetic Crystals

基　　金：国家自然科学基金(No.60108001)资助项目

摘　　要：本文研究了不同组分钽酸锂晶体的拉曼散射光谱,我们发现,在谱线的形状和数量方面,近化学计量比晶体与同成分晶体存在明显差异。通过实验,我们得到了钽酸锂晶体完整的长波长光学模式,并首次给出了钽酸锂晶体拉曼线宽和晶体组分的定量关系。另外,我们还发现了两个与本征缺陷相关的局域模,278 cm-1和750 cm-1峰,它们的强度与晶体中本征缺陷的数量成正比。The Raman scattering spectra of lithium tantalate crystals with different compositions were investigated. The comparison of the Raman data obtained for the congruent and the near-stoichiometric crystals reveals some differences in the shape and the number of Raman peaks, which lead to a new assignment of the long-wavelength optical phonons. And quantitative relationships between the linewidth of Raman peaks （ 142cm^ - 1 for E-phonon and 861 cm ^- 1 for A1 -phonon ） and the crystal composition were firstly presented. Two local Raman lines, 278cm^-1 and 750cm^-1, were found for the congruent crystals and attributed to the intrinsic defects, Li vacancy and anti-site Ta ion, respectively.

关 键 词：近化学计量比 钽酸锂晶体 拉曼光谱 缺陷 

分 类 号：O734[理学—晶体学]