Something about Tungsten Trioxide Properties from the Preparation Materials of Lanthanum Tungsten Electrode

Tungsten trioxide, also called tungsten anhydride, which is one of the raw preparation materials of lanthanum tungsten electrode. It is a kind of yellow powder, which is a water-insoluble, alkali-soluble and slightly soluble in acid. It can be used to prepare tungsten alloy and fireproof materials.

Physical properties:
Color: Yellow
Status: powder
Formula: WO₃
Molecular Weight: 231.85
Melting point: 1472 ℃
Boiling point: 1837 ℃
Relative density: 7.16 (water = 1)
Solubility: insoluble in water, slightly soluble in acid, alkali-soluble.
Structure: The structure is determined by the temperature.
When the temperature range is from -50 to -17 ° C, it is triclinic
When the temperature range of 17-330 ° C, it is monoclinic
When the temperature range 330-740 ° C, it is orthorhombic
When the temperature range above 740 ° C, it is tetragonal
Among them, the most common is monoclinic; and its space group is P21 / n.

Chemical properties:
When the temperature is at 850 ℃, it will significantly sublimate;
In addition to hydrofluoric acid, it almost does not react with inorganic acid, and it can be dissolved in ammonia / concentrated alkaline solution (slowly);
It can react with chlorine gas to produce chlorine oxide (heating), but not reacting with bromine and iodine.



 

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