论文标题
高压结构调查对无线电压电$ 0.5BA（ti_ {0.8} Zr_ {0.2}）O_3 $ - $ 0.5（ba_ {0.7} ca_ {0.3}）tio_3 $
High Pressure Structural Investigation on Lead-Free Piezoelectric $0.5Ba(Ti_{0.8}Zr_{0.2})O_3$-$0.5(Ba_{0.7}Ca_{0.3})TiO_3$
论文作者
论文摘要
实心解决方案$ 0.5BA（ti_ {0.8} Zr_ {0.2}）O_3 $ - $ 0.5（ba_ {0.7} ca__ {0.3}）tio_3 $（bczt）已成为无线电材料的有前途的成员，因为其具有异常高的质量质量质量为piezoelectric piezoeleclectric pysies。在这项研究中，我们着重研究BCZT上的压力依赖性拉曼光谱，粉末X射线衍射和介电恒定测量。数据显示了几个结构性过渡，其中从环境混合阶段（四边形，{\ it {p4mm}}}+正常骨{\ it {\ it {amm2}}）转换为单个阶段（{\ it {p4mm}}），在0.26 gpa，然后转换为cubcic at into cubic at in 4. GPA随后是另一种可能的结构重新排序，左右在10 GPA左右。尽管与BCZT的环境晶体学状态有很多一致性，但我们的分析证明了BCZT相图的形态相边界（MPB）中中间骨相位的存在合理。拉曼模式软化，单位细胞体积变化和$（ti/zr）o_6 $ contahedra畸变表示，转化四方向立方体表示，这与系统的著名铁电 - 偏见过渡相吻合。 4.7 GPA处的介电常数突然下降也证实了BCZT陶瓷的铁电性质损失。
The solid solution $0.5Ba(Ti_{0.8}Zr_{0.2})O_3$-$0.5(Ba_{0.7}Ca_{0.3})TiO_3$ (BCZT) has become a promising member of the lead-free piezoelectric materials because of its exceptionally high piezoelectric properties. In this study, we focus on studying pressure-dependent Raman spectroscopy, powder x-ray diffraction and dielectric constant measurements on BCZT. The data show several structural transitions are present, where the system from ambient mixed phase (tetragonal, {\it {P4mm}}+ orthorhombic {\it {Amm2}}) transforms into single phase ({\it {P4mm}}) at 0.26 GPa, then converts into cubic phase ({\it {Pm3m}}) at 4.7 GPa followed by another possible structural re-ordering around 10 GPa. Although there have been a lot of unanimity with the ambient crystallographic state of BCZT, our analysis justifies the presence of an intermediate orthorhombic phase in the Morphological Phase Boundary (MPB) of BCZT phase diagram. The transformation tetragonal to cubic is indicated by the Raman mode softening, unit cell volume change and the $(Ti/Zr)O_6$ octahedra distortion, which coincides with the well-known ferroelectric-paraelectric transition of the system. The sudden drop in the dielectric constant value at 4.7 GPa also confirms the loss of ferroelectric nature of the BCZT ceramic.
