The Properties And Preparation of Gallium Oxide Powder

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Gallium oxide Inorganic compound Ga2O3 has the chemical formula. Also called gallium trioxide. It’s a semiconductor with a large bandgap (Eg = 4.9eV) that has good electrical conductivity, light-emitting properties, and can be used to detect O2.

The Properties Of Gallium Oxide

Gallium oxide is composed of white triangular crystals. Although it is not soluble, it is easily soluble with alkali metal hydroxides, dilute acids, and hot acid solutions.

Gallium trioxide (III oxide) is the most stable oxide of gallium. It can be made by heating metal gallium to oxidize or by calcining galium nitrates, gallium hydroxides, and certain gallium compound at 200-250degC.

Ga2O3 is capable of reacting with a wide range of metal oxides. The crystal structure has been determined for gallate M(I),GaO2, obtained from alkali metaloxide reaction (above 400). The same as Al2O3 and Ln2O3, this material can be obtained by reaction of MgO with ZnO. CoO, NiO, and CuO Spinel Type M(II).

The preparation of Gallium Oxide

1. Add a highly-concentrated hot aqueous NaHCO3 to a hot solution of gadolinium trichloride (GaCl3), and boil the mixture until all gallium hydroxides have precipitated. After washing the precipitate in hot water, calcinate it at 600degC until no Cl- remains. If NH4Cl still remains, at 250degC it will react to Ga2O3 and generate GaCl3.

2. Here’s how to prepare high purity galium oxide. Use high-purity Ga metal as anode. Dissolve it in a H2SO4 solution of 5-20%, add ammonia, cool and crystallize Ga (NH4)(SO4)2 repeatedly, then dry it at 100degC. When there is excess oxygen in the air, burning at 800degC and for 2h will yield a 99.99%-99.9999% pure product.

3. The solution should be concentrated until it is close to crystallization. When this happens, the solution can be transferred to a large evaporating plate and dried. Burn the Ga(NO3)3 that has been evaporated in a muffle-furnace. The temperature must be maintained at 550°C for 5 hours. After cooling, 1.2kg of highly pure gallium oxide can be obtained.

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