Growth and Raman Study of Phase Transitions of the KTa0.63Nb0.37O3 Crystal  

作　　者：张娜娜 潘晓茹 宋明君 王继扬 

机构地区：[1]College of Chemistry & Chemical and Environmental Engineering,Weifang University [2]State Key Laboratory of Crystal Materials,Shandong University

出　　处：《Chinese Journal of Structural Chemistry》2016年第3期481-486,共6页结构化学（英文）

基　　金：Supported by the Natural Science Foundation of Shandong Province(BS2015CL012,ZR2014JL029);Higher Education and Technology Development Plan of Shandong Province(J15LA09,J14LA5)

摘　　要：The potassium tantalate niobate KTa_（0.63）Nb_（0.37）O_3 single crystal with large size and good quality was synthesized by Czochralski method.The crystal composition and structure were determined by electric probe microanalysis（EPMA） and X-ray diffraction（XRD） technique,respectively.The sequence of phase transitions of the as-grown crystal was investigated by Raman scattering technique.What features in the phonon spectrum corresponding to each phase transition,namely cubic to tetragonal（C-T）,tetragonal to orthorhombic（T-R） and orthorhombic to rhombohedral（O-R）,is discussed.Following the features the C-T phase transition point measured is in the vicinity of –40 ℃,and the difference from theoretical value was discussed;T-O phase transition point is at around –130 ℃,while the O-R phase transition point was not obtained due to the band overlapping and experiment limit.The potassium tantalate niobate KTa_（0.63）Nb_（0.37）O_3 single crystal with large size and good quality was synthesized by Czochralski method.The crystal composition and structure were determined by electric probe microanalysis（EPMA） and X-ray diffraction（XRD） technique,respectively.The sequence of phase transitions of the as-grown crystal was investigated by Raman scattering technique.What features in the phonon spectrum corresponding to each phase transition,namely cubic to tetragonal（C-T）,tetragonal to orthorhombic（T-R） and orthorhombic to rhombohedral（O-R）,is discussed.Following the features the C-T phase transition point measured is in the vicinity of –40 ℃,and the difference from theoretical value was discussed;T-O phase transition point is at around –130 ℃,while the O-R phase transition point was not obtained due to the band overlapping and experiment limit.

关 键 词：phase transitions Raman scattering potassium tantalate niobate 

分 类 号：O78[理学—晶体学]