Abstract
Tungsten trioxide exists in several modifications which are distorted variants of the ReO3 structure. Recently, however, a new form of tungsten trioxide was synthesized (1) with the same octahedral framework as found for the hexagonal alkali metal tungsten bronzes (2) and for MoW11O36 and MoW14O45 (3). Hexagonal WO3 was prepared by dehydration of a new hydrate formed by hydrothermal treatment of a tungstic acid gel. We have found that hexagonal WO3 may also be synthesized by oxidation of hexagonal ammonium tungsten bronze using aqueous hydrogen peroxide. The initial product is a fully oxidized hexagonal structure which contains ammonium cations. Hexagonal WO3 is obtained from this intermediate by heating at 350°C. Intercalation reactions of h-WO3 with alkali metals and hydrogen are described.
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