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Tungsten pentoxide (W2O5) was reported in early literature but proved to have the stoichiometry W18O49. Sometimes called mineral blue, it is a blue solid formed by the reaction of tungsten trioxide, WO3, and tungsten metal at 700 °C.
Intermediate oxides of tungsten
There are a number of these unusual intermediate oxides formed from reacting metal and trioxide namely, W20O58, W24O70. W18O49 contains both octahedral and pentagonal bipyramidal co-ordination of the metal atoms by oxygen.
- Wells A.F. (1984) Structural Inorganic Chemistry 5th edition Oxford Science Publications ISBN 0-19-855370-6
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