Accession Number : AD0711641

Title :   SOME REACTIONS OF TUNGSTEN (VI) OXIDE AND MOLYBDENUM (VI) OXIDE WITH LIQUID SULFUR.

Descriptive Note : Special repts.,

Corporate Author : AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS

Personal Author(s) : Goodrum,John W.

Report Date : 23 JUL 1970

Pagination or Media Count : 34

Abstract : 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 Mo(IV) oxide at 250C; Mo(IV) sulfide at 400C; W(IV) sulfide at 400C. The oxidation product detected whenever reduced species were found was sulfur(IV) oxide. Additional evidence of species WO(x)S(y) 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)

Descriptors :   (*SULFUR, *REDUCTION(CHEMISTRY)), (*CRYSTAL GROWTH, *SOLVENTS), (*SULFIDES, SYNTHESIS(CHEMISTRY)), TUNGSTEN COMPOUNDS, MOLYBDENUM COMPOUNDS, OXIDES, SULFUR COMPOUNDS, DIOXIDES, CRYSTAL STRUCTURE, THESES

Subject Categories : Inorganic Chemistry
      Crystallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE