SOME REACTIONS OF TUNGSTEN (VI) OXIDE AND MOLYBDENUM (VI) OXIDE WITH LIQUID SULFUR.
AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS
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In situ generation of species for crystal growth in solution is a relatively undeveloped, but promising technique for preparation of solid state material. In this work a solvent, liquid sulfur, generates species in solution by chemical reduction at high temperatures. Evaluation of this high temperature reduction agent included measurements of qualitative and kinetic parameters for the reactions molybdic oxide - sulfur and tungstic oxide - sulfur as a function of temperature, time, and atmosphere. Temperature effects on reduction rate over the range 125 to 400C were markedly non-linear. Reduction products isolated include MoIV oxide at 250C MoIV sulfide at 400C WIV sulfide at 400C. The oxidation product detected whenever reduced species were found was sulfurIV oxide. Additional evidence of species WOxSy and polymeric sulfur was found. Results of this study indicate that liquid sulfur can serve as a straightforward reducing agent at high temperatures. The rate or extent of such reduction is easily controlled by varying thermal conditions or duration of reaction, and the products of such reductions may be readily isolated by solution techniques which remove unreacted sulfur. Author
- Inorganic Chemistry