Gallium(III) trioxide is an inorganic compound with the formula Ga2O3. It exists as several polymorphs, all of which are white, water-insoluble solids. Although no commercial applications exist, Ga2O3 is an intermediate in the purification of gallium, which is consumed almost exclusively as gallium arsenide.
Molar mass:187.444 g/mol
Appearance:white crystalline powder
Density:6.44 g/cm3, alpha
5.88 g/cm3, beta
Melting point:1,900 °C (3,450 °F; 2,170 K) alpha
1725 °C, beta
Solubility in water:insoluble
Solubility:soluble in most acids
Gallium(III) oxide has been studied in the use of lasers, phosphors, and luminescent materials. It has also been used as an insulating barrier in tight junctions.Monoclinic β-Ga2O3 is used in gas sensors and luminescent phosphors and can be applied to dielectric coatings for solar cells. This stable oxide has also shown potential for deep-ultraviolet transparent conductive oxides, and transistor applications.
ε-Ga2O3 thin films deposited on sapphire show potential applications as solar-blind UV photodetector.
Thin Ga2O3 films are of commercial interest as gas sensitive materials and Ga2O3. Ellipsometry is a procedure that can be used to determine optical functions of the β-Ga2O3.
β-Ga2O3 is used in the production of Ga2O3-Al2O3 catalyst.