KBrO3在高压下拉曼光谱和结构的研究

摘要

We investigated the structural stability of KBrO3 by means of high-pressure Raman spectroscopy and angle-dispersive X-ray diffraction(AD-XRD).The Raman spectra of KBrO3 at pressures up to 30.9 GPa showed no changes besides monotonic shifts,suggesting no structural transformation occurred up to the highest pressure studied.The AD-XRD suggested the sample remained in its ambient pressure hexagonal phase.The bulk modulus was determined to be B0=25.9(2) GPa with a pressure derivative B′0=5.68(0.38).With the combination of Raman and AD-XRD,Grüneisen parameters of KBrO3 were also determined.%利用原位高压拉曼散射和X射线衍射技术,研究了KBrO3在高压下晶格振动和晶体结构演化行为.最高压力达30.9 GPa.通过拉曼光谱发现,在高压下拉曼峰位除了单调移动,没有其它变化,表明KBrO3在研究的压力范围没有发生相变.原位高压X射线衍射实验数据显示,其在高压下依然保持常压的六方结构.通过进一步分析,分别得到了体弹模量B0=25.9(2) GPa(B′0=5.68(0.38))和部分拉曼峰的Grüneisen参数.