{sup 29}Si NMR and XPS investigation of the structure of silicon oxycarbide glasses derived from polysiloxane precursors
Conference
·
OSTI ID:51586
- Univ. Montpellier-2 (France). Precurseurs Organometalliques de Materiaux
Two silicon oxycarbide glasses with different compositions (O/Si ratio 1.2 and 1.8) were prepared by pyrolysis at moderate temperature (900 C) of polysiloxane precursors. Their structure was investigated using quantitative 29Si solid-state NMR and X-ray photoelectron spectroscopy (XPS). The environment of the silicon atoms in the oxycarbide phase corresponded to a purely random distribution of Si-O and Si-C bonds depending on the O/Si ratio of the glass only and not on the structure of the precursors. At the light of the NMR results, the Si2p XPS spectra of the glasses may be interpreted using the contribution of the five possible {und Si}O{sub x}C{sub 4{minus}x} tetrahedra. The C1s spectra of these glasses indicated the presence of oxycarbide carbon in {und C}-Si{sub 4} tetrahedra, similar to carbide carbon, and graphitic-like excess carbon.
- OSTI ID:
- 51586
- Report Number(s):
- CONF-940411--; ISBN 1-55899-246-4
- Country of Publication:
- United States
- Language:
- English
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