Brillouin Spectroscopy Study of the Stress-Induced Ferroelectric Order in Lead-Free Relaxor 0.93(Na1/2Bi1/2)TiO3-0.07BaTiO3 Ceramics
Brillouin Spectroscopy Study of the Stress-Induced Ferroelectric Order in Lead-Free Relaxor 0.93(Na1/2Bi1/2)TiO3-0.07BaTiO3 Ceramics
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DOI：
10.1016/j.actamat.2022.118218
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发表时间：
2022-07
期刊：
影响因子：
9.4
通讯作者：
Alexander Martin;M. Brehl;N. Khansur;F. Werr;D. de Ligny;K. Webber
中科院分区：
文献类型：
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作者：
Alexander Martin;M. Brehl;N. Khansur;F. Werr;D. de Ligny;K. Webber
在本研究中，对多晶0.93(Na1/2Bi1/2)TiO3-0.07BaTiO3（NBT-7BT）进行了情景依赖的拉曼和布里频光谱分析。布里渊散射揭示了在起始应力周围弹性特性的应力依赖变化，以及在高应力水平下横向声波模式的出现，这被认为是由于长程有序的形成。这些数据与额外的拉曼散射测量、原位x射线衍射和宏观应力-应变行为进行了比较，揭示了在起始应力和矫顽力附近的表观晶体结构和铁电序的类似变化。
In this study,in situstress-dependent Raman and Brillouin spectroscopy has been performed on polycrystalline 0.93(Na1/2Bi1/2)TiO3-0.07BaTiO3(NBT-7BT). Brillouin scattering revealed stress-dependent changes in the elastic properties around the onset stress as well as the appearance of a transversal acoustic wave mode at elevated stress levels, which is understood to be due to the formation of long-range order. These data were compared with additional Raman scattering measurements,ex situx-ray diffraction, and macroscopic stress-strain behavior, which revealed analogous changes in the apparent crystallographic structure and ferroelectric order in the vicinity of the onset and coercive stresses.