Chin. Phys. Lett.  2021, Vol. 38 Issue (2): 026102    DOI: 10.1088/0256-307X/38/2/026102
CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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
1Department of Physics, Mathematics & Science College, Shanghai Normal University, Shanghai 200234, China
2Center for High Pressure Science and Technology Advanced Research (HPSTAR), Beijing 100094, China
3Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai 201203, China
4Academy 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
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Qunfei Zheng, Qiang Li, Saidong Xue et al  2021 Chin. Phys. Lett. 38 026102
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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.
Received: 16 November 2020      Published: 27 January 2021
PACS:  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)  
Fund: Supported by the National Natural Science Foundation of China (Grant Nos. 11674231, 11974250, and 51772192), the Science and Technology Commission of Shanghai Municipality (Grant Nos. 17070502700 and 19070502800), and the Shenzhen Development and Reform Commission Foundation for Shenzhen Engineering Research Center for Frontier Materials Synthesis at High Pressures.
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https://cpl.iphy.ac.cn/10.1088/0256-307X/38/2/026102       OR      https://cpl.iphy.ac.cn/Y2021/V38/I2/026102
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Qunfei Zheng
Qiang Li
Saidong Xue
Yanhui Wu
Lijuan Wang
Qian Zhang
Xiaomei Qin
Xiangyong Zhao
Feifei Wang
and Wenge Yang
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