Alumina A*lu"mi*na, n. [L. alumen, aluminis. See {Alum}.] (Chem.) One of the earths, consisting of two parts of aluminium and three of oxygen, {Al2O3}. [1913 Webster]

Note: It is the oxide of the metal aluminium, the base of aluminous salts, a constituent of a large part of the earthy siliceous minerals, as the feldspars, micas, scapolites, etc., and the characterizing ingredient of common clay, in which it exists as an impure silicate with water, resulting from the decomposition of other aluminous minerals. In its natural state, it is the mineral corundum. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • Al2O3 — Kristallstruktur Allgemeines Name Aluminiumoxid Andere Namen Korund (Mineral) Tonerde …   Deutsch Wikipedia

  • Al2O3 — Sapphire Sap phire (? or ?; 277), n. [OE. saphir, F. saphir, L. sapphirus, Gr. ?, of Oriental origin; cf. Heb. sapp[=i]r.] 1. (Min.) Native alumina or aluminium sesquioxide, {Al2O3}; corundum; esp., the blue transparent variety of corundum,… …   The Collaborative International Dictionary of English

  • Al2O3 — Sesquioxide Ses qui*ox ide, n. [Sesqui + oxide.] (Chem.) An oxide containing three atoms of oxygen with two atoms (or radicals) of some other substance; thus, alumina, {Al2O3} is a sesquioxide. [1913 Webster] …   The Collaborative International Dictionary of English

  • Al2O3 — Corundum Co*run dum (k[ o]*r[u^]n d[u^]m), n.; pl. {Corundums} (k[ o]*r[u^]n d[u^]mz). [Also corindon.] [From Hind. kurand corundum stone.] (Min.) The mineral alumina ({Al2O3}), as found native in a crystalline state. Transparent varieties are… …   The Collaborative International Dictionary of English

  • Al2O3 — Cette page répertorie différents polymorphes, solides qui possèdent la même composition chimique mais une structure cristalline différente.   Al2O3 est la formule chimique de : Alumine, Bauxite, Corindon (αAl2O3), Rubis, Saphir …   Wikipédia en Français

  • Al2O3 — …   Википедия

  • AL2O3 — Aluminum Oxide (aka Alumina or Sapphire) (Academic & Science » Electronics) …   Abbreviations dictionary

  • Al2O3 — • aluminum oxide (alumina) …   Maritime acronyms and abbreviations

  • Зависимость краевого угла смачивания поверхности графита для систем NaF - AlF3 и Na3AlF6 - Al2O3 от криолитового отношения и концентрации глинозема при 1050 °С (атмосфера - аргон) — Система NaF AlF3 (время выдержки 1 мин) КО 18,01 5,76 4,68 3,00 2,82 2,61 …   Химический справочник

  • Точки нонвариантных равновесий системы Na3AlF6 - AlF3 - Al2O3 — Точка Температура кристаллизации, °С Состав, % (мол.) Состав, % (масс.) Na3AlF6 AlF3 Al2O3 …   Химический справочник

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