Ga2O3 – GALLIUM (III) OXIDE

Properties of gallium (III) oxide:

White, refractory, not volatile compound. Semiconductor. Does not react with water. In the calcined form it is chemically passive. Shows amphoteric properties. It is transferred to solution by concentrated acids and alkalis. Reduced by hydrogen.


Molar mass g/mol 187.44
Density g/cm3 5.88
Melting point °C 1725

Methods for preparation of gallium (III) oxide:

2Ga(OH)3 = Ga2O3 + 3H2O (540-600° C).

4Ga(NO3)3 = 2Ga2O3 + 12NO2 + 3O2 (110-200° C).

2Ga2(SO4)3 = 2Ga2O3 + 6SO2 + 3O2 (520-700° C).

2Ga2S3 + 9O2 = 2Ga2O3 + 6SO2 (500-750° C).


Chemical reactions with gallium (III) oxide:

Ga2O3 + 6HCl(conc.) = 2GaCl3 + 3H2O.

Ga2O3 + 2NaOH(conc., hot) + 3H2O = 2Na[Ga(OH)4],

Ga2O3 + 2NaOH = 2NaGaO2 + H2O (above 150° C).

Ga2O3 + 3H2 = 2Ga + 3H2O (700° C).

Ga2O3 + 3SCl2O = 2GaCl3 + 3SO2 (200° C),

Ga2O3 + 6NH4Cl = 2GaCl3 + 6NH3 + 3H2O (250° C).

Ga2O3 + 6NaHSO4 = Ga2(SO4)3 + 3Na2SO4 + 3H2O (350-400° C).

Ga2O3 + ZnCO3 = (ZnGa2)O4 + CO2 (900-1000° C).

Ga2O3 + 3H2S = Ga2S3 + 3H2O (600-700° C).

Ga2O3 + 2NH3 = 2GaN + 3H2O (1000-1200° C).

Ga2O3 + 4Ga = 3Ga2O (500° C).


 

Did you know?

Elements in group 13 all have oxidation numbers of +3.