SPECTROSCOPIC STUDIES OF THE STRUCTURE OF AMORPHOUS AND MICROCRYSTALLINE SIC PREPARED BY THE POLYMER ROUTE

被引:15
作者
TING, SJ
CHU, CJ
MACKENZIE, JD
机构
[1] Univ of California, Los Angeles, CA
关键词
D O I
10.1557/JMR.1992.0164
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The structural evolution of amorphous and microcrystalline SiC prepared from polycarbosilane was studied using various spectroscopic methods, C-13 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.
引用
收藏
页码:164 / 169
页数:6
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