Pressure-Induced Amorphous Transition of Li2Ge7O15 Crystal
CHEN Liang-chen, GU Hui-cheng, WANG Li-jun, LI Feng-ying, CHE Rong-zheng, ZHOU Lei, XIU Li-song1, LAN Guo-xiang2
Institute of Physics, Chinese Academy of Sciences, Beijing 100080
1BSRF, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039
2Department of Physics, Nankai University, Tianjin 300071
Pressure-Induced Amorphous Transition of Li2Ge7O15 Crystal
Institute of Physics, Chinese Academy of Sciences, Beijing 100080
1BSRF, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039
2Department of Physics, Nankai University, Tianjin 300071
Abstract： Pressure-induced amorphous transition of Li2Ge7O15 (LGO) crystal has been investigated by using in situ high pressure energy dispersive x-ray diffraction with synchrotron radiation at the pressure up to 21.6 GPa. Diamond anvils were used to generate high pressure. Pressure was measured in terms of the diffraction of Pt as an internal pressure standard. The crystal structure of LGO is an orthorhombic lattice at atmospheric pressure. According to the high pressure x-ray diffraction results, new diffraction lines begin to appear and LGO undergoes an intermediate phase transition at the pressure of 12.9 GPa. But, the diffraction lines disappear wholly and LGO becomes an amorphous phase at the pressure of above 14.8 GPa. This amorphous transition is irreversible.
1996, Vol. 13 
