kroomIIIoksiid

KroomIIIoksiid, also known as chromium(III) oxide and with the chemical formula Cr2O3, is a green, chemically stable oxide of chromium. It occurs naturally as the mineral eskolaite and is a common oxide of chromium in both natural and industrial contexts. Cr2O3 crystallizes in the corundum structure and has a very high melting point, making it resistant to heat and chemical attack. It is practically insoluble in water and largely inert to acids and bases under ordinary conditions.

Industrial production of Cr2O3 typically involves calcination of chromium(III) hydroxide or hydrated chromium oxide to form the oxide. It can also be obtained as a byproduct or intermediate in the processing of chromite or other chromium-containing compounds. The material is supplied as a fine powder or as a dense, hard ceramic material, depending on the processing route.

Applications of chromium(III) oxide are driven by its vivid green color, chemical stability, and hardness. It is widely used as a green pigment in ceramic glazes, enamel, glass, plastics, and paints, sometimes referred to as chromium oxide green. In materials engineering, Cr2O3 serves as a protective, wear- and corrosion-resistant coating, and it is employed as a catalyst support in certain chemical processes. Its refractoriness also makes it of interest in high-temperature ceramics and refractory applications.

Cr2O3 is valued for its color stability and inertness, though handling considerations for powder forms include standard safety practices for particulate materials. In nature, eskolaite is rare, and most commercial Cr2O3 is synthetically produced for industrial use.