GALLIUM(III) OXIDE (CAS: 12024-21-4)

GALLIUM(III) OXIDE is a white triangle crystal particles. Does not dissolve in water. Slightly soluble in hot acid or alkali solution. Melting point 1900 ℃ (at 600 ℃ into beta type).Soluble in alkali metal hydroxide and dilute mineral acids.  With alpha, beta, two variations. For white rhombohedron alpha type.

Preparation

Gallium oxide is precipitated in hydrated form upon neutralization of acidic or basic solution of gallium salt. Also, it is formed on heating gallium in air or by thermally decomposing gallium nitrate at 200-250˚C. It can occur in five different modifications, α,β,δ,γ and ε. Of these modifications β-Ga2O3 is the most stable form.

Preparation Methods for the Five Modifications

1. β-Ga2O3 is prepared by heating nitrate, acetate, oxalate or other organic derivatives above 1000˚C.

2. α-Ga2O3 can be obtained by heating β-Ga2O3 at 65kbars and 1100˚C for 1 hour giving a crystalline structure. The hydrated form can be prepared by decomposing precipitated and “aged” gallium hydroxide at 500˚C.

3. γ-Ga2O3 is prepared by rapidly heating the hydroxide gel at 400˚C-500˚C. A more crystalline form of this polymorph can be prepared directly from gallium metal by a solvothermal synthesis.[4]

4. δ-Ga2O3 is obtained by heating Ga(NO3)3 at 250˚C.

5. ε-Ga2O3 is prepared by briefly heating δ-Ga2O3 at 550˚C for 30 minutes.

Applications and Uses

Gallium(III) oxide is an important functional material. It has been studied in the use of lasers, phosphors and luminescent materials, has been shown to demonstrate catalytic properties and has also been used as an insulating barrier in tight junctions. The stable oxide of gallium, monoclinic β-Ga2O3, has current applications 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.

Matters need Attention

Safety instructions: S24/25: avoid contact with skin and eyes;

Category: toxic substances;

Toxicity grading: low toxicity;

Acute toxicity: oral LD50 in mice: 10000 mg/kg. Abdominal cavity – LD50 in mice: 5000 mg/kg;

Storage and transportation characteristics: warehouse ventilated dry at low temperature;

Fire extinguishing agent, dry powder, foam, sand, carbon dioxide, water mist;

Storage method: store in a cool, dry inside storeroom

Package:50 kg/drum, inner double plastic bag; Or 50 kg/bag, double plastic bag; Can also according to customer requirements packaging