CsBr高压X光研究

 采用同步辐射X光源和能散法，对CsBr粉末样品进行高压原位X光衍射实验。由金刚石对顶压砧高压装置（DAC）产生高压，用已知状态方程的Pt粉末作内标，由Pt的衍射数据确定样品压力，最高压力达64.4 GPa。实验结果表明：室温常压下原始CsBr样品是具有简单立方结构的晶体，其晶格常数α＝0.428 5 nm。高压下CsBr的结构有所变化，在51.3~58.4 GPa的压力范围内，(110)线和(211)线发生劈裂，从而形成了四方相。

X-RAY DIFFRACllON STUDIES ON CsBrUNDER HIGH PRESSURE

In situ high pressure X-ray diffraction experiments have been carried out on CsBr using energy dispersion method with synchrotron radiation source. The pressure was generated by the high pressure device－diamond anvil cell (DAC). The pressures up to 64.4 GPa were determinded by the diffraction data of Pt used as an inner pressure standard, whose EOS is known. The results indicate that the original sample AsBr is in simple cubic structure at room temperature and atmosphere pressure, its lattice parameter α=0.428 5 nm. The structure of CsBr is changed to tetragonal phase at high pressure, marked by the splitting of the diffraction lines (110) and (211) after 51.3 GPa.