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Structural Transition of Nanometer SiO2 Powders under High Pressure and High Temperature

ZHANG Guang qiang1, XU Da peng1, WANG De yong1, ZHANG Lin1,2, SONG Geng xin1, XUE Yan feng1, SUN Jing shu1, LIU Xiao mei1, SU Wen hui1,3,4   

  1. 1. College of Physics, Jilin University, Changchun 130021, China; 2. Department of Mathematics and Mechanics, Heilongjiang Institute of Science and Technology, Harbin 150027, China; 3. Center for the Condensed\|matter Science and Technology, Harbin Institute of Technology, Harbin 150001, China; 4. International Center for Materials Physics, Chinese Academy of Sciences, Shenyang 110015, China
  • Received:2007-03-27 Revised:1900-01-01 Online:2008-03-26 Published:2008-03-26
  • Contact: XU Da peng

Abstract: 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 α-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 SiO2 is much lower than that from common α-quartz. 

Key words: nanometer SiO2, α-quartz, coesite, high pressure and high temperature, crystallize 

CLC Number: 

  • O521