Tungsten and oxygen
The
tungsten-oxygen system is rather complex. Besides the stable stoichiometric
binary oxides (WO
3, WO 2.9,
WO 2.72,
and WO 2),
and the stoichiometric tungstates and acids, a variety of nonstoichiometric,
fully oxidized and reduced compounds exists, according to the scheme in Figure
below.
Survey of
tungsten-oxygen compounds
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