Structural evolution during pyrolysis of sol-gel derived hybrid materials |
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Authors: | S Diré F Babonneau |
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Institution: | (1) Dip. di Ingegneria dei Materiali, Università di Trento, v. Mesiano 77, 38050 Trento, Italia;(2) Chimie de la Matière Condensée, Université Pierre et Marie Curie, 4, place Jussieu, 75252 Paris, France |
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Abstract: | Siloxane-titania materials have been prepared starting from diethoxydimethylsilane and titanium isopropoxide. The transparent starting gels can be described as nanocomposites formed with siloxane chains and TiO2-based particles. The pyrolysis process under argon atmosphere up to 1600°C has been followed by various techniques such as infrared and solid state NMR spectroscopies, X-ray diffraction and Ti K-edge X-ray Absorption. Si-C bond cleavage begins at low temperature leading to redistribution reactions with the formation of new Si-O bonds. Crystallization of TiO2 at low temperature is prevented and titanium carbide starts to form around 800°C. Samples pyrolyzed at 1600°C show the presence of SiO2 and TiC crystalline phases. |
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Keywords: | hybrid materials pyrolysis solid state NMR X-ray absorption titanium carbide |
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