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Phase formation in mixed TiO2-ZrO2 oxides prepared by sol-gel method

Kraleva, Elka and Saladino, Maria Luisa and Matassa, Roberto and Caponetti, Eugenio and Enzo, Stefano and Spojakina, Alla (2011) Phase formation in mixed TiO2-ZrO2 oxides prepared by sol-gel method. Journal of Structural Chemistry, Vol. 52 (2), p. 330-339. ISSN 0022-4766. eISSN 1573-8779. Article.

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DOI: 10.1134/S0022476611020132

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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°C. The mixed oxide with 37 mol.% of ZrO2 treated at 550°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°C). The anatase phase is not observed in the sample containing 37 mol.% of ZrO2. The treatment at 700°C causes the formation of the srilankite (Ti0.63Zr0.37Ox) phase.

Item Type:Article
ID Code:6157
Status:Published
Refereed:Yes
Uncontrolled Keywords:TiO2–ZrO2 mixed oxides, sol-gel method, srilankite, Rietveld method
Subjects:Area 03 - Scienze chimiche > CHIM/02 Chimica fisica
Divisions:002 Altri enti e centri di ricerca del Nord Sardegna > INSTM-Consorzio Interuniversitario Nazionale per la Scienza e la Tecnologia dei Materiali, Unità di ricerca di Sassari
001 Università di Sassari > 01 Dipartimenti > Chimica
Publisher:Springer New York
ISSN:0022-4766
eISSN:1573-8779
Copyright Holders:Original Russian Text Copyright © 2011 by E. Kraleva, M. L. Saladino, R. Matassa, E. Caponetti, S. Enzo, and A. Spojakina
Deposited On:13 Jun 2011 16:27

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