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Spectroscopic studies of the structure of amorphous and microcrystalline SiC prepared by the polymer route

Published online by Cambridge University Press:  29 June 2016

S-J. Ting ,
C-J. Chu  and
J. D. Mackenzie
S-J. Ting
Affiliation:
Department of Materials Science and Engineering, University of California, Los Angeles, California 90024-1595
C-J. Chu
Affiliation:
Department of Materials Science and Engineering, University of California, Los Angeles, California 90024-1595
J. D. Mackenzie
Affiliation:
Department of Materials Science and Engineering, University of California, Los Angeles, California 90024-1595
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Abstract

The structural evolution of amorphous and microcrystalline SiC prepared from polycarbosilane was studied using various spectroscopic methods, 13C CPMAS NMR (cross-polarization, magic angle spinning nuclear magnetic resonance), ESR (electron spin resonance), FTIR (Fourier transformation infrared spectroscopy), and Raman. These studies indicate that the carbon-rich a-SiC has two major structural defects, C==C double bonds and C-dangling bonds. Both defect concentrations vary with firing conditions. The effect of hydrogen on the defect concentrations was also investigated by heat-treating the sample under hydrogen atmosphere. The mechanisms of the conversion process were discussed and the structural models for both amorphous and microcrystalline SiC were also proposed.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 1 , January 1992 , pp. 164 - 169
Copyright
Copyright © Materials Research Society 1992

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References

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