Thermal Behaviour of Titania Based Materials: Mathematical modeling of emanation thermal analysis results |
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Authors: | Balek V Zeleňák V Mitsuhashi T Beckman I N Haneda H Bezdička P |
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Institution: | (1) Nuclear Research Institute, CZ-250 68 e , Czech Republic;(2) National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, 305-0044 Ibaraki, Japan;(3) Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic, 250 68 e , Czech Republic |
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Abstract: | Emanation thermal analysis (ETA) was used in the characterization of microstructure changes during heating ofprecursors for the titania based materials: hydrous titania, TiO2 nH2O (n=0.58) and hydrous titania containing 10% ruthenia,(TiO2)0.9(RuO2)0.1 nH2O (n=1.5). The precursors were heated at the constant rate 6 K min–1 in argon flow in the range 20–1000°C. ETA results were compared with the theoretical curves simulating the temperature dependences of radon release rate, E(T). Two mathematical models were used in the simulation. The models considered either subsequent or simultaneous solid state processes (i.e. dehydration, crystallization orphase transition, resp.) during thermal treatment of titania based materials. A good agreement was found between experimental and the simulated ETA curves. The results of ETA were confirmed by XRD patterns of intermediate products of thermal treatment of the precursors.This revised version was published online in November 2005 with corrections to the Cover Date. |
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Keywords: | emanation thermal analysis hydrous titania mathematical modeling XRD |
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