Abstract
Silicon oxycarbide glass containing boron was prepared by pyrolysis of a sol-gel precursor in inert atmosphere. A structural characterization of the gel as well as of the SiBOC glass at various stages of the pyrolysis treatment has been performed. The precursor gels consists of SiOSi bonds with boron-rich regions in which BOB and/or BOH bonds are present. During the pyrolysis boron atoms are incorporated into the silicate network leading to the formation of a silicon(boron)oxycarbide glass. A further increase of the pyrolysis temperature results in the crystallization of SiC. The glass structure can thus be described as a borosilicate matrix with a fine dispersion β-SiC nanocrstals.
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