Structure, Morphology, and Band Gap of Ti-V-O Mixed Oxides Processed by Coprecipitation and Calcination

M.W. Parka, Y.S. Lima, Y.M. Sungb, D.J. Kwakb and J.S. Leea aDepartment of Materials Engineering, Kyungsung University, Busan, 608-736, Korea bDepartment of Electrical Engineering, Kyungsung University, Busan, 608-736, Korea

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Mixed oxides of Ti-V-O were co-precipitated by wet process using TiCl4 and VOCl3 as starting materials. As-precipitated gels were calcinated at 800°C for 4 hours in oxygen atmosphere. Effects of vanadium content on the structural evolution, morphology, and band gap of Ti-V-O oxides were investigated. Calcination has produced mixtures of TiO2/VO2/V2O5 oxides and has allowed formation of Ti1-xVxO2. Lattice parameters of rutile TiO2 were precisely measured to investigate vanadium substitution into single rutile phase of Ti1-xVxO2 with varying vanadium content. As vanadium addition was increased, particles were coarsening rapidly during calcination. Band gap of the Ti-V-O oxides was measured using ultraviolet visible light spectrometer. A decrease of band gap down to 1.7 eV with the addition of maximum of 10 at.% of vanadium was measured, which is due to the formation of single phase of Ti1-xVxO2 as well as the formation of metallic VO2 or V2O5 particles.

DOI: 10.12693/APhysPolA.129.468 PACS numbers: 81.05.Hd