Structural properties of multi-component silicon oxycarbide glasses derived from metal alkoxide precursors
| Autor: | S. Kitchin, R. Dupree, Andrew P. Howes, M. Rappensberger, A.M. Wootton, M. H. Lewis |
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| Rok vydání: | 1996 |
| Předmět: |
Glass-ceramic
Materials science Spinel chemistry.chemical_element Mineralogy Mullite engineering.material Condensed Matter Physics Electronic Optical and Magnetic Materials law.invention chemistry Chemical engineering law Materials Chemistry Ceramics and Composites Magic angle spinning engineering Crystallization Boron Pyrolysis Powder diffraction |
| Zdroj: | Journal of Non-Crystalline Solids. 204:217-227 |
| ISSN: | 0022-3093 |
| DOI: | 10.1016/s0022-3093(96)00491-7 |
| Popis: | Existing sol-gel polymerisation/pyrolysis routes employed to form simple silicon oxycarbide (SiOC) glass compositions have been adapted to form more complex, multi-component glasses based on borosilicon oxycarbide (BSiOC) and aluminosilicon oxycarbide (AlSiOC) systems. Each system has been characterised at the gel, glass and glass ceramic stage by X-ray powder diffraction (XRD), 29Si, 27Al and 11B magic angle spinning nuclear magnetic resonance (MAS NMR) and transmission electron microscopy (TEM). The boron component of the BSiOC glass system exhibited predominantly BO3 coordination. The Al component of the AlSiOC glass system exhibited combinations of tetrahedral, pentacoordinated and octahedral coordination over a range of pyrolysis temperatures. For both systems SiC bonds were formed and retained throughout the hydrolysis, polymerisation and inert atmosphere pyrolysis stages with evidence of β-SiC crystallisation at elevated temperatures (> 1300°C). Crystallisation of both spinel and mullite phases has also been observed at elevated temperatures (> 1300°C) in the AlSiOC glass system. |
| Databáze: | OpenAIRE |
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