Zhang Xiaotong, Gao Yang, Xing Zhenfang, Peng Di, Han Yonghao
State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China.
Center for High Pressure Science and Technology Advanced Research, Shanghai, 201203, China.
Phys Chem Chem Phys. 2023 Jul 26;25(29):19606-19611. doi: 10.1039/d3cp02084c.
In this work, we prepared a BiOBr powder sample by the coprecipitation method for high-pressure AC impedance spectroscopy tests, high-pressure Raman measurements and high-pressure X-ray diffraction experiments to explore its structural properties and electrical transport processes under compression. Two pressure-driven isostructural phase transitions, T-T' and T'-T'' (T - tetragonal, T' - tetragonal 1 and T'' - tetragonal 2), were discovered at around 10.0 and 15.0 GPa, respectively. The pressure-induced changes in the crystal structure and electrical transport of BiOBr can provide a reference for explaining the mechanism of the isostructural phase transition of other similar compounds after compression.
在本工作中，我们通过共沉淀法制备了用于高压交流阻抗谱测试、高压拉曼测量和高压X射线衍射实验的BiOBr粉末样品，以探究其在压缩状态下的结构特性和电输运过程。分别在约10.0 GPa和15.0 GPa处发现了两个压力驱动的同结构相变，即T-T'和T'-T''（T - 四方相，T' - 四方相1，T'' - 四方相2）。BiOBr晶体结构和电输运的压力诱导变化可为解释其他类似化合物压缩后同结构相变的机制提供参考。
