Microstructural Study of Vanadium—Titanium Oxide Powders Obtained by Laser-Induced Synthesis
✍ Scribed by Laura E. Depero; Paolo Bonzi; Mirella Musci; Cristina Casale
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 230 KB
- Volume
- 111
- Category
- Article
- ISSN
- 0022-4596
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✦ Synopsis
Using laser-induced pyrolysis, powder samples of pure (\mathrm{TiO}{2}) and mixed oxides with different vanadium content were prepared and analyzed by XRD. The diffraction patterns were interpreted in microstructural terms by Fourier analysis of their peak profiles. The influence of vanadium on the phase transition was studied and the changes in the particle and microstrain distributions obtained at different temperatures were analyzed. There is an evident correlation between the initial microstrain distribution in the (\mathrm{Ti}{1-x} \mathrm{~V}{x} \mathrm{O}{2}) powder and the vanadium content. The segregation of the (\mathrm{V}{2} \mathrm{O}{5}) phase causes a strain reduction into the anatase structure. We suggest that the previously observed lowering of the transition temperature for the anatase-to-rutile transformation in the presence of vanadium is due to distortions induced by this ion in the anatase structure. 1994 Academic Press, Inc.