Gallium(III) oxide

Gallium(III) oxide is an inorganic compound and ultra-wide-bandgap semiconductor with the formula Ga2O3. It is actively studied for applications in power electronics, phosphors, and gas sensing. The compound has several polymorphs, of which the monoclinic β-phase is the most stable. The β-phase’s bandgap of 4.7–4.9 eV and large-area, native substrates make it a promising competitor to GaN and SiC-based power electronics applications and solar-blind UV photodetectors. The orthorhombic ĸ-Ga2O3 is the second most stable polymorph. The ĸ-phase has shown instability of subsurface doping density under thermal exposure. Ga2O3 exhibits reduced thermal conductivity and electron mobility by an order of magnitude compared to GaN and SiC, but is predicted to be significantly more cost-effective due to being the only wide-bandgap material capable of being grown from melt. β-Ga2O3 is thought to be radiation-hard, which makes it promising for military and space applications.

Gallium(III) trioxide

β-Ga2O3 crystal

Crystal structure of β-Ga2O3
Names
Other names
gallium trioxide, gallium sesquioxide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.031.525
EC Number
  • 234-691-7
PubChem CID
RTECS number
  • LW9650000
UNII
  • InChI=1S/2Ga.3O Y
    Key: QZQVBEXLDFYHSR-UHFFFAOYSA-N Y
  • InChI=1/2Ga.3O/rGa2O3/c3-1-5-2-4
    Key: QZQVBEXLDFYHSR-OGCFUIRMAC
SMILES
  • O=[Ga]O[Ga]=O
Properties
Ga2O3
Molar mass 187.444 g/mol
Appearance white crystalline powder
Melting point 1,725 °C (3,137 °F; 1,998 K)
insoluble
Solubility soluble in most acids
Structure
Monoclinic, mS20, space group = C2/m, No. 12
a = 1.2232 nm, b = 0.3041 nm, c = 0.5801 nm
α = 90°, β = 103.73°, γ = 90°
β-phase
4
Thermochemistry
92.1 J/(mol·K)
Std molar
entropy (S⦵298)
 85.0 J/(mol·K)
Std enthalpy of
formation (ΔfH⦵298)
 −1089.1 kJ/mol
−998.3 kJ/mol
Enthalpy of fusion (ΔfH⦵fus)
 100 kJ/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references
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