Pure titania, zirconia, and mixed oxides (3-37 mol.% of ZrO2) are prepared using the sol-gel method and calcined at different temperatures. The calcined samples are characterized by Raman spectroscopy, X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, and nitrogen adsorption porosimetry. Measurements reveal a thermal stability of the titania anatase phase that slightly increases in the presence of 3-13 mol.% of zirconia. Practically, the titania anatase-rutile phase transformation is hindered during the temperature increase above 700 degrees C. The mixed oxide with 37 mol.% of ZrO2 treated at 550 degrees C shows a new single amorphous phase with a surface area of the nanoparticles double with respect to the other crystalline samples and the formed srilankite structure (at 700 degrees C). The anatase phase is not observed in the sample containing 37 mol.% of ZrO2. The treatment at 700 degrees C causes the formation of the srilankite (Ti0.63Zr0.37Ox) phase.

PHASE FORMATION IN MIXED TiO2-ZrO2 OXIDES PREPARED BY SOL-GEL METHOD / Kraleva, E.; Saladino, M. L.; Matassa, R.; Caponetti, E.; Enzo, Stefano; Spojakina, A.. - In: JOURNAL OF STRUCTURAL CHEMISTRY. - ISSN 0022-4766. - 52:2(2011), pp. 330-339.

PHASE FORMATION IN MIXED TiO2-ZrO2 OXIDES PREPARED BY SOL-GEL METHOD

ENZO, Stefano;
2011-01-01

Abstract

Pure titania, zirconia, and mixed oxides (3-37 mol.% of ZrO2) are prepared using the sol-gel method and calcined at different temperatures. The calcined samples are characterized by Raman spectroscopy, X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, and nitrogen adsorption porosimetry. Measurements reveal a thermal stability of the titania anatase phase that slightly increases in the presence of 3-13 mol.% of zirconia. Practically, the titania anatase-rutile phase transformation is hindered during the temperature increase above 700 degrees C. The mixed oxide with 37 mol.% of ZrO2 treated at 550 degrees C shows a new single amorphous phase with a surface area of the nanoparticles double with respect to the other crystalline samples and the formed srilankite structure (at 700 degrees C). The anatase phase is not observed in the sample containing 37 mol.% of ZrO2. The treatment at 700 degrees C causes the formation of the srilankite (Ti0.63Zr0.37Ox) phase.
2011
PHASE FORMATION IN MIXED TiO2-ZrO2 OXIDES PREPARED BY SOL-GEL METHOD / Kraleva, E.; Saladino, M. L.; Matassa, R.; Caponetti, E.; Enzo, Stefano; Spojakina, A.. - In: JOURNAL OF STRUCTURAL CHEMISTRY. - ISSN 0022-4766. - 52:2(2011), pp. 330-339.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11388/61364
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