Author/Authors :
Shi، نويسنده , , Lihong and Kong، نويسنده , , Yongfa and Yan، نويسنده , , Wenbo and Liu، نويسنده , , Hongde and Li، نويسنده , , Xiaochun and Xie، نويسنده , , Xiang and Zhao، نويسنده , , Di-Hua Sun، نويسنده , , Lei and Xu، نويسنده , , Jingjun and Sun، نويسنده , , Jun and Chen، نويسنده , , Shaolin and Zhang، نويسنده , , Ling and Huang، نويسنده , , Ziheng and Liu، نويسنده , , Shiguo and Zhang، نويسنده , , Wanlin and Zhang، نويسنده , , Guangyin، نويسنده ,
Abstract :
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 (142 cm−1 for E-phonon and 861 cm−1 for A1-phonon) and the crystal composition were firstly presented. Two local Raman lines, 278 and 750 cm−1, were found for the congruent crystals and attributed to the intrinsic defects, Li vacancy and anti-site Ta ion, respectively.
Keywords :
A. Lithium tantalate , E. Raman spectrum , C. Crystal stoichiometry , C. Defects
