高压下LiB_3O_5晶体-非晶体相变的研究  

CRYSTALLINE AMORPHOUS TRANSITION OF LiB 3O 5 UNDER HIGH PRESSURE

作　　者：陈良辰[1,2] 王莉君[1,2] 顾惠成 李凤英[1,2] 周镭 车荣钲[1,2] 修立松 

机构地区：[1]中国科学院物理研究所 [2]中国科学院高能物理研究所

出　　处：《高压物理学报》1998年第4期250-253,共4页Chinese Journal of High Pressure Physics

摘　　要：采用Ｘ射线粉末衍射和同步辐射能散Ｘ射线衍射技术，对ＬｉＢ３Ｏ５（ＬＢＯ）晶体进行了压致非晶化相变的研究，压力达４５．１ＧＰａ。实验结果表明，ＬＢＯ存在两个中间相变，压力分别为５ＧＰａ和１５．８ＧＰａ。而当压力增加到２５～３１．６ＧＰａ时，ＬＢＯ出现非晶态，这个非晶化相变是不可逆的。Pressure induced amorphous transition of LiB 3O 5(LBO) has been investigated by using in situ high pressure X ray powder diffraction and energy dispersive X ray diffraction with synchrotron radiation at the pressure up to 45 1GPa.According to the experimental results,LBO undergoes two intermediate phase transitions at pressure of about 5 and 15 8GPa,respectively.But LBO crystal becomes an amorphous phase in the pressure range of about 25～31 6GPa and this amorphous transition is irreversible.

关 键 词：压致非晶化相变 高压 X射线衍射 LiB3O5 

分 类 号：O521.2[理学—高压高温物理]