Abstract
ZrO2/TiO2/SiO2 (ZrO2 up to 6.7 mass%) composites with variable oxide ratios that were fabricated by a template sol–gel method were studied. The morphology was described. The structure was analyzed using scanning electron and confocal laser microscopy, small-angle x-ray scattering, and Raman spectroscopy. It was established that the composites were nanostructured micron-sized tubes of ZrO2/TiO2/SiO2. The microtubes were constructed from nanoparticles with the anatase structure and general formula Ti1-xZrxO2 (x = 0–0.05). Changes of Raman spectra were examined as a function of ZrO2 content in the composites and the annealing temperature. The contribution of optical phonon scattering to the ν8(E1g) peak position was determined. The ν4(B1g) peak position and the gyration radius of the nanocrystallites were shown to be related.
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