The Properties And Preparation of Gallium Oxide Powder
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Update time : 2021-03-01 08:59:06
Gallium oxide is an inorganic compound with the chemical formula Ga2O3. Also known as gallium trioxide, it is a wide-bandgap semiconductor with Eg=4.9eV, which has excellent electrical conductivity and light-emitting characteristics, it can also be used as an O2 chemical detector.
The Properties of Gallium Oxide
Gallium oxide is white triangular crystalline particles, insoluble in water, it is slightly soluble in hot acid or alkaline solution, and easily soluble in alkali metal hydroxides and dilute inorganic acids.
Gallium (III) oxide, namely gallium trioxide, is the most stable of gallium oxides. Heating metal gallium in the air to oxidize it, or calcining gallium nitrate, gallium hydroxide and certain gallium compounds at 200-250°C can form Ga2O3.
Under heating conditions, Ga2O3 can react with many metal oxides. The crystal structure of gallate M(I)GaO2 obtained by alkali metal oxide reaction (above 400℃) has been determined. Like Al2O3 and Ln2O3, it can be formed by reaction with MgO, ZnO, CoO, NiO and CuO Spinel type M(II)Ga2O4.
The Preparation of Gallium Oxide
1. Add a highly concentrated hot aqueous solution of NaHCO3 to the hot aqueous solution of gallium trichloride GaCl3, and boil until all the gallium hydroxides are precipitated. Wash the precipitate with hot water until there is no Cl-, and calcinate above 600°C to obtain β-Ga2O3. When NH4Cl remains, it will react with Ga2O3 at 250°C to generate volatile GaCl3.
2. This is the preparation method of high purity gallium oxide. Take high-purity metal Ga as the anode, dissolve it in a 5%-20% H2SO4 solution, add ammonia to the solution, cool, and repeatedly crystallize Ga(NH4)(SO4)2, then dry it at 105°C. Under the condition of excess oxygen, Burning at 800°C for 2h, a product with a purity of 99.99% to 99.9999% is obtained.
3. Weigh 1kg of 99.9999% high-purity gallium into a three-necked flask, add high-purity nitric acid to dissolve the gallium, then filter, pour the filtrate into a three-necked flask, and transfer to the electric furnace to evaporate (in a fume hood When it is concentrated to close to crystallization, transfer the solution to a large evaporating dish and evaporate to dryness. Put the evaporated Ga(NO3)3 in a muffle furnace for burning. The temperature is controlled at 550℃ for 5h. After cooling, the finished product is taken out to obtain 1.2kg of high-purity gallium oxide.
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