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What property does tungsten dioxide have?
The chemical formula of WO3 is a powdery light yellow triclinic crystal. When temperatures are higher than 740degC tungsten oxide crystals become orange tetragonal crystalline, and return to their original state upon cooling. Tungsten dioxide powder is stable at air temperatures, with a melting and boiling point above 1750degC.
Tungsten Oxide is not soluble in water, nor in any inorganic acid other than hydrofluoric. In hot concentrated sodium chloride solution, WO3 can be dissolved with ammonia. When the temperature exceeds 650°C, it can be reduced to tungsten by H2, and by C at temperatures between 1000-1100°C.
How is tungsten dioxide used?
Tungsten dioxide is used in many ways every day. The tungsten oxide is commonly used in the production of industrial X-ray screen and fireproof fabrics. The yellow pigment tungsten dioxide is used in ceramics, paints, and other products.
The production of electrochromic and smart windows has used tungsten oxide. These windows are the glass with the electric switch, the performance of light transmission and the applied voltage. Users can tint their windows by altering the amount or heat. Use of high-density, inert metals is another option. In the 2008-2009 war between Israel and Gaza Strip, the use of these explosives was more prominent.
Some tungsten oxide can be used to make chemical products like paints, coatings and catalysts in the petroleum industry. ; however, tungsten dioxide is an intermediary product. A large amount of this oxide is used to produce metal tungsten particles and tungsten carbide powders. This is then used for the production of metal products tungsten.
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