Al2o3

The compound Al2O3, also known as aluminum oxide or alumina, is a white crystalline powder with a melting point of 2,072 °C and a boiling point of 2,977 °C. It has a high hardness and is extremely resistant to wear and corrosion.

Al2O3 is an important industrial material and is used in a wide variety of applications, such as catalysts, abrasives, refractory materials, electrical insulators, and ceramics. It can be synthesized by several methods, including the Bayer process, the Hall-Heroult process, and sol-gel synthesis.

Al2O3 has a hexagonal close-packed crystal structure and its lattice parameters are a = 4.758 Å and c = 12.991 Å. It is an electrically insulating material with a band gap of approximately 8.7 eV. At high temperatures, it exhibits both ionic and covalent bonding.

Al2O3 has a high thermal conductivity and high mechanical strength, making it an ideal material for use in high-temperature applications. It also has a low coefficient of thermal expansion and is chemically inert, which makes it useful for applications that require stability over a wide range of temperatures and chemical environments.

In summary, Al2O3 is a versatile material with many useful properties, and its detailed understanding is critical for its effective use in various industries.