Aluminium oxide - Wikipedia
网页It occurs naturally in its crystalline polymorphic phase α-Al 2 O 3 as the mineral corundum, varieties of which form the precious gemstones ruby and sapphire. Al 2 O 3 is used to produce aluminium metal, as an abrasive owing to its hardness, and as a refractory material owing to its high melting point. [7]
Alumina | Properties, Uses & Production Process | Britannica
网页2024年8月16日 · Alumina is aluminum oxide, a white or nearly colourless crystalline substance that is used for aluminum metal, ceramics and chemical processing. Learn how alumina is made from bauxite, its properties and applications, and its relation to corundum, sapphire and ruby.
Aluminum Oxide - ScienceDirect
网页1991年1月1日 · Pure single-crystal aluminum oxide is colorless, transmitting radiation over a wide spectra range (4.5 μm to 250 nm). Bauxite (∼ 85–90% pure with respect to Al 2 O 3) contains impurity oxides such as SiO 2, Fe 2 O 3, TiO 2 and, in small amounts (parts per million), the technically important Ga 2 O 3.
Aluminum Oxide | Al2O3 Material Properties - Accuratus
网页Aluminum oxide, commonly referred to as alumina, possesses strong ionic interatomic bonding giving rise to it’s desirable material characteristics. It can exist in several crystalline phases which all revert to the most stable hexagonal alpha phase at elevated temperatures.
Aluminum Oxide and Alumina Ceramics (review). Part 1.
网页2019年8月15日 · A review of aluminum oxide (Al2O3) properties, varieties, and methods for producing dispersed, polycrystalline, and single-crystal Al2O3 products. Learn about the applications, characteristics, and challenges of Al2O3 in refractories, electronics, medicine, and ceramic armor.
Aluminum Oxide (Alumina) | Formula, Properties & Application
网页Aluminum Oxide, or Alumina, is an inorganic compound with the chemical formula 2 Al2 O3. It is a white, crystalline, and amphoteric material that is widely used in aluminum production, refractories, abrasives, electronics, and medical applications.
Metal-Induced Crystallization in Metal Oxides | Accounts of …
网页A postsynthetic, solid-state approach that reduces crystallization temperature in metal oxides is metal-induced crystallization (MIC). MIC is the introduction of catalytic amounts of a cation, which can be an s-block, p-block, or d-block cation, that migrates through the solid metal oxide lattice.
Atomic-Scale Insights into the Oxidation of Aluminum
网页The surface oxidation of aluminum is still poorly understood despite its vital role as an insulator in electronics, in aluminum–air batteries, and in protecting the metal against …
Aluminum Oxide Nanoparticles: Properties and Applications …
网页2024年2月28日 · Learn about the synthesis, properties, and applications of aluminum oxide nanoparticles (Al2O3 NPs), also known as alumina nanoparticles. Al2O3 NPs have potential in catalysis, biomedical, electronic, and optoelectronic fields, as well as antimicrobial and antiviral properties.
Surface Energies and Thermodynamic Phase Stability in ... - Science
网页1997年8月8日 · Corundum, α-Al 2 O 3, is the thermodynamically stable phase of coarsely crystalline aluminum oxide, but syntheses of nanocrystalline Al 2 O 3 usually result in γ-Al 2 O 3. Adsorption microcalorimetry, thermogravimetric analyses, and Brunauer-Emmett-Teller adsorption experiments, coupled with recently reported high-temperature solution ...