Alumina
Alumina
Alumina (pronunciation: /əˈluːmɪnə/), also known as Aluminium Oxide or Al2O3, is a white or nearly colorless crystalline substance commonly used in ceramics, electrical insulation, and abrasives.
Etymology
The term "Alumina" is derived from the word "alumine," which is the old French word for alum. The word "alum" itself comes from the Latin word "alumen," meaning bitter salt.
Description
Alumina is a hard, chemically resistant material and has the ability to withstand very high temperatures in aggressive environments. It is used in a wide range of industrial applications such as aluminium production, abrasive products, and ceramic materials.
Related Terms
- Aluminium: A silvery-white, ductile metallic element, the most abundant in the earth's crust but found only in combination, chiefly in bauxite.
- Bauxite: An amorphous clayey rock that is the chief commercial ore of aluminium. It consists largely of hydrated alumina with variable proportions of iron oxides.
- Corundum: A mineral, aluminium oxide, Al2O3, notable for its hardness and many varieties of color.
- Sapphire: A gem variety of corundum, usually blue but naturally occurring in all colors except red. It is used as a gemstone, a semiconductor, and for cutting and abrasion.
- Ruby: A red variety of corundum, used as a gemstone and in lasers.
External links
- Medical encyclopedia article on Alumina
- Wikipedia's article - Alumina
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