DyVO_(4)高压拉曼光谱研究  

High pressure Raman spectroscopic study of DyVO_(4)

作　　者：王宝云 宋茂双[1,3] WANG Baoyun;SONG Maoshuang(State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China;CAS Center for Excellence in Deep Earth Science, Guangzhou, 510640, China)

机构地区：[1]中国科学院广州地球化学研究所同位素国家重点实验室,广东广州510640 [2]中国科学院大学,北京100049 [3]中国科学院深地科学卓越创新中心

出　　处：《光散射学报》2021年第2期149-155,共7页The Journal of Light Scattering

基　　金：国家自然科学基金项目(41874107、41574079)。

摘　　要：利用金刚石压腔和拉曼光谱研究了DyVO_(4)的压缩行为。结果表明:DyVO_(4)在0-35.4 GPa发生了两次相变。第一次相变在7.8±0.5 GPa开始,在13.3 GPa结束,DyVO4从锆石相不可逆地转变成白钨矿相,这个相变伴随着锆石相拉曼峰的消失和白钨矿相拉曼峰的出现,光谱特征清晰。第二个相变发生在约21.9 GPa,DyVO_(4)从白钨矿相进一步可逆地转变成褐钇铌矿相。白钨矿相模133 cm^(-1)(Bg)频率随压力的演化趋势在相变点发生变化,另外对应VO_(4)四面体伸缩振动区域的拉曼峰在褐钇铌矿相逐渐展宽。DyVO_(4)的褐钇铌矿相一直稳定到35.4 GPa,卸压到常压后,DyVO_(4)是白钨矿相。The compression behaviour of DyVO_(4) has been studied using the combined diamond anvil cell and Raman spectra.The results show DyVO_(4) experiences two phase transitions at pressure from ambient pressure to 35.4 GPa.The first phase transition takes place at 7.8±0.5 GPa and finishes at 13.3 GPa.DyVO_(4) transforms from zircon phase to scheelite phase companied by distinct disappearance and appearance of Raman peaks in zircon phase and scheelite phase.The second phase transition takes place at 21.9 GPa,DyVO_(4) transforms from scheelite phase to fergusonite phase.The evolution of 133 cm-1(Bg)mode of scheelite phase changes at transition point.The modes corresponding to stretching vibration of VO_(4) of fergusonite phase gradually broaden.The fergusonite phase is stable up to 35.4 GPa.DyVO_(4) is scheelite phase at ambient condition after decompression.

关 键 词：拉曼光谱 高压 锆石 白钨矿 褐钇铌矿 

分 类 号：O521.2[理学—高压高温物理]