What Are the Colors of Tungsten Oxide?

Tungsten oxide is a semiconductor material widely used in photoelectrochemistry. It has a variety of oxidation states, yellow tungsten oxide (wo3, yto), blue tungsten oxide (wo2.9, bto), purple tungsten oxide (wo2.72, vto) and brown tungsten oxide (wo2). Blue tungsten refers to a kind of dark blue compound containing tungsten (ⅵ) and tungsten (v) in mixed valence states. The composition is very complex, and there are intermediate oxides such as wo2 and wo4. It is one of the important raw materials for the production of tungsten powder.

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