Synthesis and Characterization of Vanadium Substituted Potassium Tungsten Bronzes, K<sub>x</sub>V<sub>y</sub>W<sub>1-y</sub>O<sub>3</sub>
Keywords:Tungsten bronzes, Vanadium substituted bronze, Bronzoids
A series of vanadium substituted potassium hexagonal tungsten bronzes KxVyW1-yO3 (K-HTB) were prepared by conventional solid state method at 800 °C with compositions of x = 0.30 and 0.00 ? y ? 0.15. A mixture of K-HTB and non bronze phases with y ? 0.20 was observed. The proportion of this non bronze phase increases with increasing vanadium content. The non bronze phases in the mixture could not be indexed yet. In contrast, a very small amount of vanadium can be substituted in potassium tetragonal tungsten bronzes (K-TTB) at 800 °C with x = 0.50 and 0.00 ? y ? 0.02, however at 700 °C vanadium substituted K-TTB can be prepared with 0.00 ? y ? 0.05. Further substitution of vanadium in K-TTB decomposes to K-HTB and non-bronze phases.
Keywords: Tungsten bronzes; Vanadium substituted bronze; Bronzoids.
© 2012 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved.
doi: http://dx.doi.org/10.3329/jsr.v4i2.9349 J. Sci. Res. 4 (2), 507-514 (2012)
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