Abstract
Abstract 1) Reaction product vaporizes from the filament as tungsten trioxide and its colorless deposit is reduced with hydrogen liberated by the reaction. Consequently, the blue deposit having the mean apparent composition of WO2.80 can be obtained. 2) The WO3 deposit is reduced readily with atomic hydrogen down to WO2.80, but the reduction rate becomes appreciably slower at the lower oxidation state. 3) Oxygen is not contained in hydrogen. This suggests that WO3 is not formed by a reaction of tungsten with gaseous oxygen liberated by thermal decomposition of water vapor, but is formed directly by a reaction of tungsten with water vapor.
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