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Amorphization of Cristobalite at High Temperature in Vacuum

Published online by Cambridge University Press:  01 August 2005

Chang-Ming Xu ,
S.W. Wang ,
X.X. Huang  and
J.K. Guo
Chang-Ming Xu
Affiliation:
Structural Ceramics Center, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, People’s Republic of China; andGraduate School of Chinese Academy of Sciences, Shanghai, 200050, People’s Republic of China
S.W. Wang*
Affiliation:
Structural Ceramics Center, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, People’s Republic of China
X.X. Huang
Affiliation:
Structural Ceramics Center, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, People’s Republic of China
J.K. Guo
Affiliation:
Structural Ceramics Center, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, People’s Republic of China
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

Amorphous transition behavior of silica polymorphs under high pressure has been extensively studied by using diamond-anvil cells or shock wave technologies at ambient temperature. Here, we report the amorphization of crystalline silica fiber in cristobalite polymorph in the temperature range of 1050–1350 °C without pressure applied in vacuum. X-ray diffraction, infrared spectra, and Raman spectra illustrated the transition. Raman spectra revealed that no significant changes had happened to the SiO4 unit during the transition. It is suggested that the driven-off of interstitial oxygen attributed to the transition and the reaction between the diffusing hydrogen and interstitial oxygen promoted the process.

Keywords

Phase transformation
Type
Rapid Communications
Information
Journal of Materials Research , Volume 20 , Issue 8 , August 2005 , pp. 1943 - 1946
Copyright
Copyright © Materials Research Society 2005

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References

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