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 most stable tungsten oxides. It is insoluble in water and inorganic acids except hydrofluoric acid. It can be dissolved 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. Tungsten oxide (WO3) is a common tungsten compound with the following physical and chemical properties:
Appearance: Tungsten oxide is a yellow to light blue crystalline or amorphous solid.
Density: The density of tungsten oxide is about 7.16 to 7.26 grams per cubic centimeter.
Melting point: The melting point of tungsten oxide is about 1,470 degrees Celsius.
Solubility: Tungsten oxide is almost insoluble in water, but it can be dissolved in strong alkaline solution to form tungstate.
Optical properties: Tungsten oxide is a material with good transparency, which can transmit light from ultraviolet to near infrared.
Conductivity: Tungsten oxide has semiconducting properties and can exhibit adjustable conductivity under certain conditions.
Stability: Tungsten oxide is relatively stable at normal temperature, but it will react with reducing agent at high temperature.
Photocatalytic performance: Tungsten oxide can exhibit photocatalytic activity under certain conditions, and has potential applications such as decomposition of organic matter and water splitting.
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