LiAl5O8高压相变研究(英文)  

Pressure-Iduced Phase Transition of LiAl_5O_8

作　　者：武琪[1] 彭放[1] 李庆华[1] 雷力[2] 李荣祺[1] 

机构地区：[1]四川大学原子与分子物理研究所,四川成都610065 [2]爱媛大学地球动力学研究中心,日本松山7908677

出　　处：《高压物理学报》2012年第3期338-342,共5页Chinese Journal of High Pressure Physics

基　　金：HPCAT is supported by DOE-BES,DOE-NNSA,NSF,and the W.M.Keck Foundation;APS is supported by DOE-BES,under Contract No.DE-AC02-06CH11357

摘　　要：运用金刚石压砧同步辐射X射线衍射,对尖晶石结构的LiAl5O8进行了高压原位研究。实验发现:在高压下,一组LiAl5O8的新相衍射峰出现,随着压力的增加,其新相衍射峰逐渐增强,当压力增加到45.0GPa时,LiAl5O8的低压相衍射峰全部消失,而形成了一组高压新相衍射峰。采用指标化程序对衍射数据进行处理和分析,确定这一高压新相为正交晶系结构,其晶胞参数为a=0.995 9nm,b=0.644 7nm,c=0.333 4nm,空间群为Pmm2。A phase transition concerning lithium aluminate oxide （LiAl5O8） was observed. High pressure synchrotron radiation X-ray diffraction was used to explore its structure in a diamond anvil cell up to 47.0 GPa. We found the two phases are coexisted over a very large pressure range in the experiments. According to the analysis on the dynamic change of diffraction peaks with the increasing of pressure and the data reduction using indexed program, a new high-pressure phase of LiAls 08 was identified at pressure below 45.0 GPa. This new phase has potentially a orthorhombic structure with a = 0. 995 9 nm, b= 0. 644 7 nm, c=0. 333 4 nm and the space group of Prom2.

关 键 词：LiAl5O8 高压 相变 

分 类 号：O521.23[理学—高压高温物理]