Tungsten Oxides Colours (IV)

Details: Category: Tungsten Information; Published on Tuesday, 03 February 2015 19:38

Colours can also change with the temperature of the material due to alterations in the reflectivity of the oxides. Thermochromism is the property of substances to change colour due to a change in temperature and WO3 is an attractive example for this property. On cooling the oxide by liquid nitrogen down to -196°C, a sudden change occurs from yellow to white, which then alters to a bluishwhite colour between -50 and -27°C. At room temperature it becomes pale lemon-yellow again. On further heating to 200-300°C, WO3 becomes dark yellow, changing to a deep orange colour at 400 to 500°C. These reversible colour changes are linked to changes in the electronic properties of WO3 which alter due to changes of the internal symmetry of the WO3 crystals (through alterations of the lattice arrangements).

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