crystalline alumina

crystalline alumina

[′kris·tə·lən ə′lüm·ə·nə]
(materials)
An abrasive which consists of essentially the same mineral as corundum, but whose physical properties such as crystal structure, size, and shape of grain are so controlled as to produce the most desirable abrasives for specific types of grinding.
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References in periodicals archive ?
6), (9) To deposit crystalline alumina phases, substrate temperatures higher than 500[degrees]C are generally required.
Li, Q, Yu, YH, Bhatia, CS, Marks, LD, Lee, SC, Chung, YW, "Low-Temperature Magnetron Sputter-Deposition, Hardness and Electrical Resistivity of Amorphous and Crystalline Alumina Thin Films.
20) In the former case, thickening of the amorphous film proceeds at both the metal/Film and film/environment interfaces, through co-operative transport of O2- and Al3+ ions across the pre-existing film: for crystalline alumina development at sufficiently elevated temperatures, this usually proceeds below the amorphous film at sites where molecular oxygen can react with the substrate.