纳米SiO2在高压高温下的结构转化  

Structural Transition of Nanometer SiO_2 Powders under High Pressure and High Temperature

作　　者：张广强[1] 许大鹏[1] 王德涌[1] 张琳[1] 宋更新[1] 薛燕峰[1] 孙敬姝[1] 刘晓梅[1] 苏文辉[1] 

机构地区：[1]吉林大学物理学院,长春130021

出　　处：《吉林大学学报（理学版）》2008年第2期311-313,共3页Journal of Jilin University:Science Edition

基　　金：国家自然科学基金(批准号:3037040610674034)

摘　　要：以纳米SiO2粉体为原料，在高压高温下研究其晶化过程．XRD和Raman谱表明，纳米SiO2在常压1000～1600℃条件下，晶化成α-方石英和少量的鳞石英；在2．0～3．5GPa，320～1100℃条件下，晶化成α-石英；在3．9GPa，320～1100℃条件下，晶化成柯石英．The crystallization process of nanometer SiO2 powder under high pressure and high temperature was investigated. The experiment results show that nanometer SiO2 powder crystallizes to α-cristobalite with a little tridymite under normal pressure at 1 000～ 1 600 ℃, crystallizes to a-quartz under 2.0～ 3.5 GPa and 320 1 100 ℃, and crystallizes to coesite under 3.9 GPa and 320 ～ 1 100 ℃. The temperature of coesite formation from nanometer SiO2 is much lower than that from common a-quartz.

关 键 词：纳米SIO2 α-石英 柯石英 高压高温 晶化 

分 类 号：O521[理学—高压高温物理]