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What property does tungsten dioxide have?
The chemical formula of WO3 is a powdery light yellow triclinic crystal. The tungsten dioxide crystals turn orange when the temperature exceeds 740degC. They 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 sodium hydroxide solution, WO3 can be dissolved with ammonia. When the temperature exceeds 650°C, it can be reduced with H2 and by C at 1000-1100°C to get tungsten.
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 screens phosphors, fireproof fabrics and tungstate. The yellow pigment tungsten oxide can also be 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 voltage change. Users can tint their windows by altering the amount or light. 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. The tungsten-oxide intermediate is used to produce metal tungstens and tungsten carbide powders.
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