6533b7d7fe1ef96bd1268e4f
RESEARCH PRODUCT
Phase formation in mixed TiO2-ZrO2 oxides prepared by sol-gel method
Stefano EnzoRoberto MatassaElka KralevaAlla SpojakinaEugenio CaponettiMaria Luisa Saladinosubject
Anatasex ray scatteringMaterials scienceelectron microscopyScanning electron microscopeMineralogysrilankite Rietveld method.Inorganic Chemistryx ray scattering; electron microscopyChemical engineeringTransmission electron microscopyPhase (matter)Materials ChemistryMixed oxideTiO2—ZrO2 mixed oxidesol-gel methodCubic zirconiaPhysical and Theoretical ChemistryPowder diffractionSol-gelSettore CHIM/02 - Chimica Fisicadescription
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2011-04-01 |