Local-scale structural response of (1-x)Na0.5Bi0.5TiO3-xBaTiO3to external electric fields
Local-scale structural response of (1-x)Na0.5Bi0.5TiO3-xBaTiO3to external electric fields
复制标题
DOI：
10.1063/1.5070118
复制
发表时间：
2019-01
影响因子：
4
通讯作者：
G. de la Flor;S. Gorfman;B. Mihailova
中科院分区：
文献类型：
--
作者：
G. de la Flor;S. Gorfman;B. Mihailova
采用原位拉曼光谱分析了x范围为0 ~ 0.074的（1-x）Na0.5Bi0.5TiO3-xBaTiO3在室温下沿伪赝[100]c或[110]c方向外加直流电场E作用下的局部结构和原子动力学，以进一步深入了解亲形相边界（MPB）附近极性耦合的原子机制。结果表明，E [100] c引起的拉曼散射变化具有显著的成分依赖性，并表明，在MPB附近具有赝赝结构的碱-铋基固溶体中，纵向压电系数增强的来源是由于成分驱动的局部应变降低以及外部刺激下结构柔韧性的增强。采用原位拉曼光谱分析了x范围为0 ~ 0.074的（1-x）Na0.5Bi0.5TiO3-xBaTiO3在室温下沿伪赝[100]c或[110]c方向外加直流电场E作用下的局部结构和原子动力学，以进一步深入了解亲形相边界（MPB）附近极性耦合的原子机制。结果表明，E [100] c引起的拉曼散射变化具有显著的成分依赖性，并表明，在MPB附近具有赝赝结构的碱-铋基固溶体中，纵向压电系数增强的来源是由于成分驱动的局部应变降低以及外部刺激下结构柔韧性的增强。
The local structure and atomic dynamics of (1-x)Na0.5Bi0.5TiO3-xBaTiO3 with x ranging from 0 to 0.074 were analyzed at room temperature by in situ single-crystal Raman spectroscopy under an external dc electric field E applied along the pseudocubic [100]c or [110]c directions, to gain further insights into the atomistic mechanism of polar coupling near the morphotropic phase boundary (MPB). The results reveal a striking compositional dependence of the E [ 100 ] c-induced changes in the Raman scattering and suggest that the origin of the enhanced longitudinal piezoelectric coefficient in alkali-Bi based solid solutions with a pseudocubic structure near MPB is due to the composition-driven reduction of the local strains and the consequent enhancement of the structural flexibility under external stimuli.The local structure and atomic dynamics of (1-x)Na0.5Bi0.5TiO3-xBaTiO3 with x ranging from 0 to 0.074 were analyzed at room temperature by in situ single-crystal Raman spectroscopy under an external dc electric field E applied along the pseudocubic [100]c or [110]c directions, to gain further insights into the atomistic mechanism of polar coupling near the morphotropic phase boundary (MPB). The results reveal a striking compositional dependence of the E [ 100 ] c-induced changes in the Raman scattering and suggest that the origin of the enhanced longitudinal piezoelectric coefficient in alkali-Bi based solid solutions with a pseudocubic structure near MPB is due to the composition-driven reduction of the local strains and the consequent enhancement of the structural flexibility under external stimuli.