绿柱石的原位高压X射线研究  

In-Situ High-Pressure X-Ray Diffraction of Natural Beryl

作　　者：秦善[1] 刘景[2] 李海建[1] 祝向平[1] 李晓东[2] Qin, Shan[1]; Liu, Jing[2]; Li, Hai-Jian[1]; Zhu, Xiang-Ping[1]; Li, Xiao-Dong[2]

机构地区：[1]北京大学地球与空间科学学院,北京100871 [2]中国科学院高能物理研究所,北京100039

出　　处：《高压物理学报》2008年第1期1-5,共5页Chinese Journal of High Pressure Physics

基　　金：国家自然科学基金(40672024);中国科学院知识创新工程方向性项目(KJCX2-SW-N20)

摘　　要：采用同步辐射光源和金刚石对顶砧（DAC）技术，对绿柱石进行了室温下的原位高压能散X射线衍射（EDXD）研究，实验的最高压力为19．2GPa。在实验压力范围内，未观察到绿柱石发生相变，轴压缩率c大于α；在小于9．3GPa的压力范围内，其体积压缩率符合二阶Murnaghan状态方程，而压力在9．3～19．2GPa范围内时，其体积压缩率有所增加，且体积一压力关系近乎线性变化。At room temperature, in-situ high-pressure energy dispersive X-ray diffraction （EDXD） inspections on beryl has been carried out using diamond anvil cell（DAC） device with synchrotron radiation source. The maximal pressure in the experiment is 19.2 GPa. In the range of experimental pressure,no evidence for the phase transition of beryl was observed. However, the axial compressibility along c axis is larger than that along a axis. The volume compressibility could be described with Murnaghan equation of state in the range of room pressure to 9.3 GPa,while in 9. 3～19. 2 GPa,the volume compressibility shifts and increases with pressure in a nearly linear relationshio.

关 键 词：绿柱石 同步辐射 高压 相变 X射线衍射 

分 类 号：O521.2[理学—高压高温物理]