Gallium oxide
Properties
Chemical formula: Ga₂O₃
Name: Gallium(III) oxide / gallium oxide
CAS No.: 12024-21-4
Molar mass: 187.44 g/mol
Density: 6.44 g/cm³ (monoclinic β modification)
Melting point: approx. 1900 °C
Color: white
Form: fine powder or single-crystal substrate
Band gap of β-Ga₂O₃: approx. 4.8-4.9 eV
Critical electric field: approx. 8 MV/cm
Solubility: insoluble in water, soluble in hot mineral acids and strong alkalis
Gallium(III) oxide (Ga₂O₃), also known as gallium oxide, is an inorganic compound and an important material for ultra-wide-bandgap semiconductor technologies. It is available as a fine white powder or as a single-crystal substrate. With a melting point of approximately 1900 °C, the material offers very high thermal stability.
Ga₂O₃ occurs in several polymorphic modifications, including the α, β, γ, δ and ε phases. At room temperature, the monoclinic β modification, β-Ga₂O₃, is the thermodynamically most stable form.
One of the key properties of β-Ga₂O₃ is its ultra-wide band gap of approximately 4.8-4.9 eV. The material also features a critical electric field of around 8 MV/cm, making it highly attractive for high-voltage and power-electronic devices.
Gallium oxide also provides high transparency in the deep-ultraviolet and visible spectral ranges. This makes it suitable for solar-blind UV photodetectors and other specialized optoelectronic applications. Ga₂O₃ is insoluble in water but dissolves in hot mineral acids and strong alkaline solutions.
Industrial gallium oxide can be produced by thermal calcination of gallium nitrate, gallium hydroxide or gallium oxalate at temperatures above 800 °C. Single crystals can also be grown directly from the melt using processes such as the Czochralski or EFG method.
Gallium and its compounds are particularly important in power electronics, UV optoelectronics, sensing, catalyst technology and thin-film applications. Gallium oxide is also used as a source material for sputtering targets and functional oxide coatings.
Would you like to buy gallium oxide? Auremo can provide information about available Ga₂O₃ grades and delivery conditions. The gallium price, gallium metal price and gallium price per kg primarily refer to gallium metal, while the gallium oxide price depends on purity, product form, quantity and supply conditions.
Advantages
• Ultra-wide band gap of approximately 4.8-4.9 eV
• High critical electric field of approximately 8 MV/cm
• Suitable for advanced high-voltage power electronics
• Single crystals can be grown directly from the melt
• High thermal stability
• High transparency in the deep-UV and visible ranges
• Suitable for solar-blind UV sensing
• Applicable in functional thin-film technologies
Applications
• Next-generation power electronics
• High-voltage Schottky diodes
• Field-effect transistors (FETs)
• Inverters for electric mobility and energy grids
• Solar-blind UV photodetectors
• Flame monitoring and ozone measurement
• Specialized UV detection systems
• Catalysts and gas sensors
• High-temperature hydrogen and carbon monoxide sensing
• Thin-film technology
• Sputtering targets
• Transparent conductive oxide coatings
• Doping of zinc oxide
Auremo offers gallium oxide and other specialty materials for industrial and advanced technical applications. If you have any questions about Ga₂O₃, available purity grades, product forms or delivery conditions, please contact us directly.
