两种传压介质下氟化锶的高压相变研究  

High-pressure Behaviors of SrF_2 with Two Pressure Transmitting Mediums

作　　者：崔啟良[1] 崔航[1] 王婧姝[1,2] 祝洪洋[1] 吴晓鑫 张健[1] 

机构地区：[1]吉林大学超硬材料国家重点实验室,吉林长春130012 [2]吉林师范大学物理学院,吉林四平136000

出　　处：《吉林师范大学学报（自然科学版）》2015年第3期1-4,共4页Journal of Jilin Normal University:Natural Science Edition

基　　金：国家自然科学基金项目(11404137;51172087;11304111;U1330115);中国高等教育博士点专项科研基金项目(20110061110011);中国国家重点基础研究发展计划项目(2011CB808204);吉林省教育厅"十二五"科学技术研究项目(0520306)

摘　　要：采用高压拉曼实验技术和高压同步辐射技术对氟化锶的高压相变及卸压过程进行研究.两种传压介质下的高压拉曼和高压同步辐射实验结果表明,氟化锶在5~6 GPa会发生由立方相到正交相的结构相变.在卸压过程中相变具有较强的滞后性,这是由氟化锶的自身属性决定的,与实验选择的传压介质无关.当样品卸至常压后,当氟化锶内部的残余应力完全释放后其相变是可逆的.该结果为进一步研究其它碱土金属氟化物的高压相变和物理性质提供了重要的实验依据.The high-pressure phase transition and decompression behavior of SrF 2 with two pressure transmitting mediums have been investigated by angle-dispersive synchrotron X-ray and Raman techniques .The pressure-induced fluorite structure to orthorhombic structure transition is observed at 5-6 GPa.Upon decompression ,the experimental data point that the transition from orthorhombic to cubic phase exhibits strong hysteresis .The hysteresis cannot be attributed to the pressure transmitting medium , which might be explained as the inherent sluggish nature of SrF 2 .The phase transformation is reversible when the residual stress in sample is completely released upon decompression .From this work ,it will provide an important experimental data for the further study on the high pressure phase transition and physical properties of other alkaline earth metal fluorides .

关 键 词：氟化锶 传压介质 滞后 

分 类 号：O521.2[理学—高压高温物理]