Tungsten pentoxide W2O5
Tungsten pentoxide (W2O5) was reported in early literature but proved to have the stoichiometry W18O49.[1] Sometimes called mineral blue it is a blue solid formed by the reaction of tungsten trioxide, W2O3, and tungsten metal at 700 °C.[1] There are a number of these unusual intermediate oxides formed from reacting metal and trioxide namely, W20O58,W24O70.[1] W18O49 contains both octahedral and pentagonal bipyramidal coordination of the metal atoms by oxygen.[1]
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