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Title of Journal: J Therm Anal Calorim

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Abbravation: Journal of Thermal Analysis and Calorimetry

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Springer Netherlands

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1572-8943

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Phase transition in niobium pentoxide supported on

Authors: V S Braga F A C Garcia J A Dias Sílvia C L Dias
Publish Date: 2008/07/02
Volume: 92, Issue: 3, Pages: 851-855
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Abstract

Nb2O5 supported on SiO2Al2O3 were prepared with a wide loading range 2 5 10 15 20 and 25 mass and analyzed by simultaneous thermogravimetric TG and differential thermal analysis DTA The materials presented a phase transition close to 1364°C This phase transition was studied by XRD FTIR and Raman spectroscopy Amixture of orthorhombic T andmonoclinic H andM crystalline phases was evidenced in the supported samples which is coverage dependent in contrast to the formation of only the monoclinic phase H and M when pure Nb2O5 is heated under the same conditions These results indicate the stabilization of Nb2O5 on silicaalumina surface

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