Blue tungsten oxide nano powder may be applied for producing thermal insulating glass material, which is widely used in fields requiring high heat insulation and high transparency, such as buildings, automobiles, and the like.
Strictly speaking, the blue tungsten oxide powder mentioned above is not the same as the industrial blue tungsten oxide. Industrial blue tungsten oxide is a powdery mixture of various tungsten compounds, that is, it is an industrially unclear product whose chemical composition and physical structure are also uncertain.
Generally, industrial blue tungsten oxide is composed of a mixture of ammonium tungsten bronze, hydrogen tungsten bronze, tungsten trioxide, β-tungsten oxide and γ-tungsten oxide. And its apparent color continuously varies from 2.72 to 3.0 with the change of oxygen index (O/W), that is, from violet to yellow. It completely replaces traditional tungstic acid and tungsten trioxide and becomes an important tungsten intermediate compound. It has been shown that blue tungsten oxide may be a solid solution of salt in tungsten trioxide to tungsten dioxide system.
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