压力诱导下CsGeBr_(3)的结构相变  

Pressure-Induced Structural Phase Transition in Halide Perovskite CsGeBr_(3)

作　　者：曲佳 王弈铭 王欣 杨文革 QU Jia;WANG Yiming;WANG Xin;YANG Wenge(State Key Laboratory of Superhard Materials,College of Physics,Jilin University,Changchun 130012,Jilin,China;Center for High Pressure Science and Technology Advanced Research,Shanghai 201203,China)

机构地区：[1]吉林大学物理学院,超硬材料国家重点实验室,吉林长春130012 [2]北京高压科学研究中心,上海201203

出　　处：《高压物理学报》2024年第5期26-35,共10页Chinese Journal of High Pressure Physics

摘　　要：近年来,压力下卤化物钙钛矿成为新的研究热点,呈现出许多优异的电学和光学等特性。高压下钙钛矿结构演变研究是所有物性研究的基石和重点。利用金刚石对顶砧压机,结合原位高压同步辐射X射线衍射、原位高压拉曼光谱、紫外-可见-近红外分光光度计测量技术和第一性原理计算,对全无机卤化物钙钛矿CsGeBr_(3)在高压下的结构演变进行了系统研究。结果表明:CsGeBr_(3)在常压下是菱方相变;在更高的压力下保持立方结构;菱方步探索卤化物钙钛矿在压力下的性质、拓展其应用前景提供了重要的科学依据。In recent years,pressure-induced physical properties of halide perovskites have attracted significant research interests due to their excellent optical and electronic properties.The study of the structural evolution of perovskite under compression is the foundation and key point of all physical property researches.In this paper,we systematically investigated the structural evolution of the all-inorganic halide perovskite CsGeBr_(3) under compression using in situ high-pressure synchrotron X-ray diffraction,in situ high-pressure Raman spectroscopy,ultraviolet/visible/near-infrared spectrophotometry,and first-principles calculations.Our results show that CsGeBr_(3) undergoes a reversible rhombohedral R3m to cubic Pm3^(-)m structural phase transition at 1 GPa,and the cubic Pm3^(-)m phase maintains at higher pressures.This study provides important scientific basis for further exploration of the properties and applications of halide perovskites under compression.

关 键 词：高压 CsGeBr_(3) 结构相变 卤化物钙钛矿 

分 类 号：O521.2[理学—高压高温物理]