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Transformation probability of graphite-diamond assisted by nonmetallic catalysts at high pressure and high temperature

Published online by Cambridge University Press:  31 January 2011

Liling Sun ,
Qi Wu ,
Yafei Zhang  and
Wenkui Wang
Liling Sun
Affiliation:
Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People's Republic of China
Qi Wu
Affiliation:
Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People's Republic of China
Yafei Zhang
Affiliation:
Department of Physics, Lanzhou University, Lanzhou, 730000, People's Republic of China
Wenkui Wang
Affiliation:
Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People's Republic of China
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Abstract

The tendency of graphite-diamond transformation assisted by nonmetallic catalysts of carbonates, sulfates, or phosphorus under high pressure and high temperature has been investigated by calculating the activation energy and transformation probability of the carbon atoms over a potential barrier. It was found that the activation energy is highly sensitive to the catalyst chosen. The value of activation energy in the systems of graphite-carbonates, graphite-phosphorus, and graphite-sulfate are 130.71 × 103, 206.03 × 103, and 221 × 103 J/mol, respectively. If fd stands for the probability of the transformation from graphite to diamond, the probability sequence of graphite-diamond transformation in different systems was put forward: fd(gr.-carbonate) > fd(gr.-phosphorus). fd(gr.-sulfate).

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 3 , March 1999 , pp. 631 - 633
Copyright
Copyright © Materials Research Society 1999

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References

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