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Nmr and Esr Studies of the Structural Defects of Amorphous and Microcrystalline Sic Prepared by the Polymer Route
Published online by Cambridge University Press: 25 February 2011
Abstract
Amorphous SiC was prepared by firing the polycarbosilane to various temperatures ranging from 500°C to 1200°C. However the l3c CPMAS NMR and ESR studies show that the carbon rich SiC has two major structural defects, C=C bonds and C-dangling bonds. Both defects concentrations vary with different sample firing conditions. Hydrogen has dramatic effect on decreasing the defect concentrations when used in the sample firing.
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