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29Si NMR and XPS Investigation of the Structure of Silicon Oxycarbide Glasses Derived from Polysiloxane Precursors

Published online by Cambridge University Press:  21 February 2011

R.J.P. Corriu ,
D. Leclercq ,
P.H. Mutin  and
A. Vioux
R.J.P. Corriu
Affiliation:
Précurseurs Organométalliques de Matériaux, UMR 44, Université Montpellier II, case 007, Place E. Bataillon. F-34095 Montpellier cedex 5, France
D. Leclercq
Affiliation:
Précurseurs Organométalliques de Matériaux, UMR 44, Université Montpellier II, case 007, Place E. Bataillon. F-34095 Montpellier cedex 5, France
P.H. Mutin
Affiliation:
Précurseurs Organométalliques de Matériaux, UMR 44, Université Montpellier II, case 007, Place E. Bataillon. F-34095 Montpellier cedex 5, France
A. Vioux
Affiliation:
Précurseurs Organométalliques de Matériaux, UMR 44, Université Montpellier II, case 007, Place E. Bataillon. F-34095 Montpellier cedex 5, France
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Abstract

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 SiOxC4-x tetrahedra. The Cls spectra of these glasses indicated the presence of oxycarbide carbon in CSi4 tetrahedra, similar to carbide carbon, and graphitic-like excess carbon.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 346: Symposium N – Better Ceramics Through Chemistry VI , 1994 , 351
Copyright
Copyright © Materials Research Society 1998

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References

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