Tungsten oxide physical properties as following:
Melting Point: 1473℃
Boiling point: 1837℃
Specific Gravity: 7.16 g/cc
Molecular weight: 231.85
Solubility in H2O: Insoluble
Appearance and Odor: Yellow to yellow green or blue or violet powder or pieces, no odor.
Tungsten oxide is used for many purposes in everyday life. It is frequently used in industry to manufacture tungstates for x-ray screen phosphors, for fireproofing fabrics and in gas sensors. Due to its rich yellow color, WO3 is also used as a pigment in ceramics and paints.
2010- AIST reports a quantum yield of 19 % in photocatalytic water splitting with a caesium-enhanced tungsten oxide photocatalyst.