Chromium(III) oxide is the asleep admixture of the blueprint Cr2O3. It is one of arch oxides of chromium and is acclimated as a pigment. In nature, it occurs as the attenuate mineral eskolaite.
Properties
Cr2O3 adopts the corundum structure, consisting of a hexagonal abutting arranged arrangement of oxide anions with 2/3 of the octahedral holes active by chromium. Similar to corundum, Cr2O3 is a hard, breakable actual (Mohs acerbity 8-8.5). It is antiferromagnetic up to 307 K, the Neel temperature. It is not readily attacked by acids or bases, although aqueous acrid gives chromites (salts with the Cr2O2−4 anion, not to be abashed with the accompanying mineral chromite). It turns amber if heated, but reverts to its aphotic blooming blush if cooled. It is aswell hygroscopic.
Applications
Because of its ample stability, Chromium(III) oxide is a frequently acclimated colorant and was originally alleged viridian. It is acclimated in paints, inks, and glasses. It is the colourant in "chrome green" and "institutional green." Chromium(III) oxide is the forerunner to the alluring colorant chromium dioxide.
It is one of the abstracts that are acclimated if cutting the edges of knives on a section of covering (also alleged stropping). In this ambience it is generally accepted as blooming compound.
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