Abstract
ACCORDING to L. Wöhler and O. Balz1,2, the oxides WO3, W2O5 (W4O11) and WO2 volatilize considerably above 800–900° C., and the vapour pressure of tungsten trioxide is, according to O. Ruff and Grieger3,2, 0·206 mm. at 1,023° C. It is generally believed that this phenomenon explains the formation of much larger metal grains during the reduction of tungsten trioxide in hydrogen at 800–900° C. from much finer oxide grains.
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References
Wöhler, L., and Balz, O., Z. Elektrochem., 27, 415 (1921).
Gmelin, "Handbuch", 53, 113, 116, 122.
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MILLNER, T., NEUGEBAUER, J. Volatility of the Oxides of Tungsten and Molybdenum in the Presence of Water Vapour. Nature 163, 601–602 (1949). https://doi.org/10.1038/163601b0
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DOI: https://doi.org/10.1038/163601b0
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