Indium oxide
Properties
Chemical formula: In₂O₃
Name: Indium oxide / indium(III) oxide
CAS No.: 1312-43-2
Molar mass: 277.64 g/mol
Density: 7.18 g/cm³
Melting point: approx. 1910 °C
Color: pale yellow to yellow-green
Form: fine powder
Crystal structure: cubic bixbyite type
Band gap: approx. 3.5-3.7 eV
Semiconductor type: n-type
Solubility: insoluble in water, soluble in hot mineral acids
Indium oxide (In₂O₃) is an amphoteric inorganic compound and an important starting material for transparent conductive oxide coatings used in modern display and semiconductor technologies. It is supplied as a fine pale-yellow to yellow-green powder and offers high thermal stability.
In₂O₃ predominantly crystallizes in a cubic bixbyite structure. It is an n-type semiconductor with a wide band gap of approximately 3.5-3.7 eV and provides high optical transparency across the visible spectral range.
In its pure form, indium oxide has moderate electrical conductivity. When doped with tin, it forms ITO - indium tin oxide - whose electrical conductivity can be increased significantly while maintaining high optical transparency. This makes the material particularly suitable for transparent electrode layers.
Indium oxide is insoluble in water but dissolves readily in hot mineral acids such as hydrochloric and nitric acid. Industrial production is mainly based on thermal calcination of indium hydroxide, indium nitrate or indium oxalate at temperatures above 700 °C.
In₂O₃ is well suited for functional thin-film deposition by PVD, CVD and Sol-Gel processing. High-purity grades can be used in sputtering-target production and other demanding electronic and optoelectronic processes.
Indium and its compounds are particularly important in ITO and IZO coatings, displays, thin-film transistors, solar cells, sensors and functional ceramics. Would you like to buy indium oxide? Auremo can provide information about available purity grades and delivery conditions. The indium price, indium metal price and indium price per kg primarily refer to metallic indium, while the indium oxide price depends on purity, quantity and material specifications.
Advantages
• High optical transparency in the visible spectrum
• Suitable for transparent conductive oxide coatings
• Strong increase in conductivity when doped with tin
• Enables transparent ITO electrode layers
• High thermal stability
• High-purity grades available up to 99.999% (5N)
• Good suitability for PVD, CVD and Sol-Gel processes
• Suitable for electronic and optoelectronic applications
Applications
• ITO sputtering-target production
• Transparent conductive coatings
• Touchscreens
• LCD and OLED displays
• Smart windows
• IGZO and IZO semiconductors
• Thin-film transistors (TFT)
• Active-matrix AMOLED displays
• Heterojunction and perovskite solar cells
• Transparent front contacts
• Gas sensors for ozone, NO₂, ethanol and other gases
• Electrochromic coatings and functional ceramics
Auremo offers indium oxide and other high-purity materials for electronic, optical and industrial applications. If you have questions about purity, product form, available quantities or delivery conditions, please contact us directly.
