Oxidation Behavior of Si Nb C O Ceramics Prepared by the Pyrolysis of Methyltriethoxysilane Based Organic-Inorganic Hybrid Gel
作者： Manabu Fukushima , Eiichi Yasuda , Yoshiyuki Nakamura , Masao Shimizu , Yoshikazu Teranishi
DOI: 10.1007/S10971-005-1258-8
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摘要: The oxidative structural characterization of Si–Nb–C–O ceramic prepared by the heat-treatment transition metal containing polymethylsilsesquioxane hybrid was investigated. heating temperature for pyrolysis precursor gels strongly affected oxidation behavior resultant ceramics. gel pyrolyzed at 600∘C rapidly oxidized, while 1000∘C showed higher resistance to oxidation. In 600∘C, new Si–O–Nb oxygen-bridged heterometal bonds were formed after oxidation, which confirmed FT-IR spectra. On other hand, silica and oxycarbide protective layer on oxidized surface heated 1000∘C, as suggested X-ray photoelectron spectroscopy (XPS). Raman spectra a large luminescence background, G D bands before After however, background disappeared band more symmetric than that non-oxidative product. This predominant radical related unstable carbon species in
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