UNSPECIFIED (1996) Structural properties of multi-component silicon oxycarbide glasses derived from metal alkoxide precursors. JOURNAL OF NON-CRYSTALLINE SOLIDS, 204 (3). pp. 217-227. ISSN 0022-3093

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Abstract

Existing sol-gel polymerisation/pyrolysis routes employed to form simple silicon oxycarbide (Si-O-C) glass compositions have been adapted to form more complex, multi-component glasses based on borosilicon oxycarbide (B-Si-O-C) and aluminosilicon oxycarbide (Al-Si-O-C) systems. Each system has been characterised at the gel, glass and glass ceramic stage by X-ray powder diffraction (XRD), Si-29, Al-27 and B-11 magic angle spinning nuclear magnetic resonance (MAS NMR) and transmission electron microscopy (TEM). The boron component of the B-Si-O-C glass system exhibited predominantly BO3 coordination. The Al component of the Al-Si-O-C glass system exhibited combinations of tetrahedral, pentacoordinated and octahedral coordination over a range of pyrolysis temperatures. For both systems Si-C bonds were formed and retained throughout the hydrolysis, polymerisation and inert atmosphere pyrolysis stages with evidence of beta-SiC crystallisation at elevated temperatures (> 1300 degrees C). Crystallisation of both spinel and mullite phases has also been observed at elevated temperatures (> 1300 degrees C) in the Al-Si-O-C glass system.

Item Type:	Journal Article
Subjects:	T Technology > TP Chemical technology T Technology > TA Engineering (General). Civil engineering (General)
Journal or Publication Title:	JOURNAL OF NON-CRYSTALLINE SOLIDS
Publisher:	ELSEVIER SCIENCE BV
ISSN:	0022-3093
Date:	October 1996
Volume:	204
Number:	3
Number of Pages:	11
Page Range:	pp. 217-227
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/18194

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