Pressure Driven Structural Evolutions of 0.935(Na$_{0.5}$Bi$_{0.5}$)TiO$_{3}$-0.065BaTiO$_{3}$ Lead-Free Ferroelectric Single Crystal through Raman Spectroscopy
Qunfei Zheng1,2,4† , Qiang Li1,3† , Saidong Xue1 , Yanhui Wu1 , Lijuan Wang2 , Qian Zhang3 , Xiaomei Qin1* , Xiangyong Zhao1 , Feifei Wang1 , and Wenge Yang3
1 Department of Physics, Mathematics & Science College, Shanghai Normal University, Shanghai 200234, China2 Center for High Pressure Science and Technology Advanced Research (HPSTAR), Beijing 100094, China3 Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai 201203, China4 Academy for Advanced Interdisciplinary Studies, Shenzhen Engineering Research Center for Frontier Materials Synthesis at High Pressures, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China
Abstract ：Pressure evolution of local structure and vibrational dynamics of the perovskite-type relaxor ferroelectric single crystal of 0.935(Na$_{0.5}$Bi$_{0.5}$)TiO$_{3}$-0.065BaTiO$_{3}$ (NBT-6.5BT) is systematically investigated via in situ Raman spectroscopy. The pressure dependence of phonon modes up to 30 GPa reveals two characteristic pressures: one is at around 4.6 GPa which corresponds to the rhombohedral-to-tetragonal phase transition, showing that the pressure strongly suppresses the coupling between the off-centered A- and B-site cations; the other structural transition involving the oxygen octahedral tilt and vibration occurs at pressure $\sim $13–15 GPa with certain degree of order-disorder transition, evidenced by the abnormal changes of intensity and FWHM in Raman spectrum.
收稿日期: 2020-11-16
出版日期: 2021-01-27
:
61.50.Ks
(Crystallographic aspects of phase transformations; pressure effects)
77.84.-s
(Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials)
78.30.-j
(Infrared and Raman spectra)
引用本文:
. [J]. 中国物理快报, 2021, 38(2): 26102-.
链接本文:
https://cpl.iphy.ac.cn/CN/10.1088/0256-307X/38/2/026102
或
https://cpl.iphy.ac.cn/CN/Y2021/V38/I2/26102
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2021, Vol. 38 
