Method for making vanadium dioxide powders

Details Method for making vanadium dioxide powders Method for making vanadium dioxide powders

1994-04-15

1995-06-27

Bos, Steven

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

423592, C01G 3100

Patent

active

054277639

ABSTRACT:
A method for making vanadium dioxide (V.sub.2 or V.sub.2 O.sub.4) powders from vanadyl sulfate without using SO.sub.2 gas, comprises evaporative decomposition of a vanadyl sulfate hydrate spray, entrained in a nitrogen atmosphere at O.sub.2 partial pressures that would normally predict V.sub.2 O.sub.5 V.sub.2 O.sub.3. The yield of VO.sub.2 (also identified as V.sub.2 O.sub.4) is substantially improved, and occurs at lower temperatures, by the addition of hydrogen gas into the atmosphere. Surprisingly, there is no production of V.sub.2 O.sub.3. Minor amounts of a suitable dopant salt dissolved in the spray provide improved low transition temperature powders.

REFERENCES:
patent: 3265464 (1966-08-01), Udd
patent: 3542697 (1970-11-01), Chamberland et al.
patent: 3562188 (1971-02-01), Mitsuishi et al.
patent: 3650680 (1972-03-01), Teeg et al.
patent: 4957725 (1990-09-01), Potember et al.

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