Basic information Physical properties Uses Preparation Reactions Safety Supplier Related
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Gallium(III) oxide

Basic information Physical properties Uses Preparation Reactions Safety Supplier Related

Gallium(III) oxide Basic information

Product Name:
Gallium(III) oxide
Synonyms:
  • galliumtrioxide
  • Gallium(III) oxide (99.999% Ga) PURATREM
  • Galliumoxidewhitepowder
  • GalliuM(III) oxide >=99.99% trace Metals basis
  • Gallium(III) oxide (Ga2O3)
  • Gallium(III) oxide, 99.999% trace metals basis
  • Gallium(Ⅲ) oxide
  • GalliuM(Ⅵ) oxide
CAS:
12024-21-4
MF:
Ga2O3
MW:
187.44
EINECS:
234-691-7
Product Categories:
  • metal oxide
  • GalliumMetal and Ceramic Science
  • Catalysis and Inorganic Chemistry
  • Chemical Synthesis
  • Gallium
  • Oxides
Mol File:
12024-21-4.mol
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Gallium(III) oxide Chemical Properties

Melting point:
1740 °C
Density 
6.44 g/mL at 25 °C
refractive index 
1.92
storage temp. 
Sealed in dry,Room Temperature
form 
Powder or Lump
color 
White
Specific Gravity
6.44
Water Solubility 
Soluble in acids. Insoluble in water
Merck 
14,4346
Stability:
Stable. Incompatible with magnesium.
InChIKey
QZQVBEXLDFYHSR-UHFFFAOYSA-N
CAS DataBase Reference
12024-21-4(CAS DataBase Reference)
EPA Substance Registry System
Gallium trioxide (12024-21-4)
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Safety Information

Safety Statements 
24/25
WGK Germany 
2
RTECS 
LW9650000
TSCA 
Yes
HS Code 
28259090

MSDS

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Gallium(III) oxide Usage And Synthesis

Physical properties

White crystals; exists in three crystalline modifications: alpha-, beta-, and gamma-Ga2O3; while the alpha-form is analogous to the corundum form of alumina, the beta-Ga2O3 is isomorphous with theta-alumina; alpha-form converts to beta-modification on calcination at high temperatures (600°C); gamma form is stable at low temperatures; density 6.44 g/cm3 (alpha-Ga2O3), 5.88 g/cm3 (betaGa2O3); melts at 1,725°C; soluble in most acids.

Gallium(III) oxide is used in the manufacture of gadolinium gallium garnet as a substrate in bubble domain memories; these are compact devices not requiring the storage power demanded by other memory devices. Gallium(III) oxide is starting material for the preparation of Sr2CuGaO3S, an example of a rare square pyramidal gallium.

Uses

The compound is used in spectroscopic analysis and in preparing gallium arsenide for making semiconductors.

Preparation

Gallium sesquioxide is precipitated in hydrated form upon neutralization of acidic or basic solution of gallium salt. Also, it is prepared by thermal decomposition of gallium salts. Gallium oxide hydroxide, GaOOH [20665-525] on calcinations at high temperatures yields betaGa2O3.

Reactions

Gallium sesquioxide is reduced to gallium suboxide, Ga2O [12024-20-3] by common reducing agents. Also, heating the sesquioxide with gallium metal yields gallium suboxide. Heating with magnesium reduces the oxide to elemental form in a violent reaction:
Ga2O3 + 3Mg →2Ga + 3MgO
Heating with mineral acids yields corresponding gallium salts. When heated with a mixture of hydrogen and arsenic vapors at 600°C, gallium arsenide, GaAs is produced. When heated with alkali metal oxide at 1,000°C, alkali metal gallates, such as K2Ga2O6 are formed.

Chemical Properties

white odourless powder

Uses

In semiconductors; gas sensing; catalysis. Nanostructures as blue and UV light emitters in optoelectronic device applications.
Gallium(III) oxide has been reported in applications in lasers, phosphors, and luminescent materials. Monoclinic ß-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. Thin Ga2O3 films are of commercial interest as gas sensitive materials. ß-Gallium(III) oxide is used in the production of Ga2O3-Al2O3 catalyst.

Uses

Gallium(III) oxide is used in vacuum deposition. It is useful for making semiconductor devices, gallium-alumina catalyst, gas sensors, luminescent phosphors and dielectric coatings of solar cells. It shows potential for developing deep-ultraviolet TCOs (Transparent Conductive Oxides) and transparent electrodes for ultraviolet optoelectronic devices. Recent studies report that gallium oxide can be a strong contender for power electronic devices for example, in ultrahigh-voltage power switching applications. Films made of gallium oxide have gained commercial interest owing to their gas sensitive characteristics, and glasses made with gallium oxide are the preferred optical materials for use in advanced technologies.

Production Methods

Gallium oxide is formed during the annealing or heating of semiconductors containing gallium in the microelectronics industry.

General Description

Odorless fine white powder. Insoluble in water.

Air & Water Reactions

Insoluble in water.

Reactivity Profile

GALLIUM(III) OXIDE may react with acids. Heating (to 1292° F) with magnesium causes a violent reduction to metallic slate.

Health Hazard

SYMPTOMS: Symptoms of exposure to GALLIUM(III) OXIDE include reduction of red blood cells and platelets, anemia, skin rash and nausea.

Fire Hazard

Flash point data for GALLIUM(III) OXIDE are not available; however, GALLIUM(III) OXIDE is probably combustible.

Gallium(III) oxideSupplier

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