silicon oxycarbide glasses
29Si solid-state nuclear magnetic resonance
X-ray photoelectron spectroscopy
Springer Online Journal Archives 1860-2000
Chemistry and Pharmacology
Abstract Silicon oxycarbide phases with different O/Si ratios were prepared by pyrolysis of highly cross-linked polysiloxane precursors. Their structure was investigated using quantitative 29 Si solid-state NMR and X-ray photoelectron spectroscopy (XPS). The prominent part played by the redistribution reactions on the ceramic yield, the composition of the oxycarbide phases and their structure was illustrated. In a large range of compositions the oxycarbide phases formed by pyrolysis at moderate temperature (〈1000°C) may be described as a purely random arrangement of CSi4 tetrahedra and Si–O–Si bridges.
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