Al2O3-TiO2 thin films and powders were synthesised from acid catalyzed sols of aluminium and titanium alkoxides containing acetyl acetone as a chelating agent. The crystallization of the system was studied as a function of the relative compositions and the firing temperature. Films of four different alumina-titania compositions (10, 20, 30 and 40mol% alumina) were prepared and fired at various temperatures in the range from 300 to 1000 °C. The films and powders were amorphous, at any composition, up to about 600 °C. Larger molar contents of Al2O3 were found to have an inhibitory effect on the crystallization of TiO2, while larger contents of TiO2 had only a weak influence on Al2O3 crystallization. The formation of a metastable BETA-Al2TiO5 phase was observed in films at 1000 °C

Crystallisation of Al2O3-TiO2 sol-gel systems

MARTUCCI, ALESSANDRO;
1999

Abstract

Al2O3-TiO2 thin films and powders were synthesised from acid catalyzed sols of aluminium and titanium alkoxides containing acetyl acetone as a chelating agent. The crystallization of the system was studied as a function of the relative compositions and the firing temperature. Films of four different alumina-titania compositions (10, 20, 30 and 40mol% alumina) were prepared and fired at various temperatures in the range from 300 to 1000 °C. The films and powders were amorphous, at any composition, up to about 600 °C. Larger molar contents of Al2O3 were found to have an inhibitory effect on the crystallization of TiO2, while larger contents of TiO2 had only a weak influence on Al2O3 crystallization. The formation of a metastable BETA-Al2TiO5 phase was observed in films at 1000 °C
1999
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/143452
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