Pure titania, zirconia, and mixed oxides (3—37 mol.% of ZrO2) are prepared using the sol-gel\ud
method and calcined at different temperatures. The calcined samples are characterized by Raman\ud
spectroscopy, X-ray powder diffraction, scanning electron microscopy, transmission electron\ud
microscopy, and nitrogen adsorption porosimetry. Measurements reveal a thermal stability\ud
of the titania anatase phase that slightly increases in the presence of 3—13 mol.% of zirconia.\ud
Practically, the titania anatase-rutile phase transformation is hindered during the temperature\ud
increase above 700 C. The mixed oxide with 37 mol.% of ZrO2 treated at 550 C shows a new\ud
single amorphous phase with a surface area of the nanoparticles double with respect to the\ud
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
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