Tungsten trioxide has a molecular formula of WO3 and a molecular weight of 231.85. It is a kind of tungstic anhydride, which is a tungstate product. Tungsten oxide includes tungsten trioxide and tungsten dioxide. There is no tungsten dioxide product in actual industrial production. Tungsten trioxide is divided into tungstic acid, sodium tungstate, calcium tungstate, ammonium paratungstate, ammonium metatungstate and other products according to the content of tungsten trioxide.
Tungsten trioxide is light yellow triclinic powder crystal. When the temperature is higher than 740°C, it turns into an orange tetragonal crystal, and returns to its original shape after cooling. It is stable in air, with a melting point of 1473°C, a boiling point higher than 1750°C, and a relative density of 7.16.
Tungsten trioxide is one of the stable tungsten oxides, insoluble in water and inorganic acids except hydrofluoric acid, soluble in hot concentrated sodium hydroxide solution and ammonia water to form soluble tungstate. When the temperature is higher than 650 ° C, it can be reduced by H2, and it can be reduced by C at 1000 ~ 1100 ° C to obtain tungsten powder.
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