Chromium (III) Oxide
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Because of its stability, chromium (iii) oxide is used as the green pigment in inks, glasses, and paints and as a colorant for ceramics, as well as producing a faint green tinge in glazes. It serves as an abrasive for polishing or stropping the edges of razors, knives, and surfaces of optical devices |
Description | ||
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Chromium(III) oxide (or chromia) is an inorganic compound with the formula Cr2O3. It is one of the principal oxides of chromium and is used as a pigment. In nature, it occurs as the rare mineral eskolaite. Cr2O3 has the corundum structure, consisting of a hexagonal close packed array of oxide anions with 2⁄3 of the octahedral holes occupied by chromium. Similar to corundum, Cr2O3 is a hard, brittle material (Mohs hardness 8 to 8.5). It is antiferromagnetic up to 307 K, the Néel temperature. It is not readily attacked by acids. The starting material for chromium oxide green is chromite. Chromium oxide green is produced by reducing the alkali chromates obtained from the ironstone. Chromium oxide green (Cr2O3 ) is largely chemically inert. It is insoluble in water, acids and alkalis. The pigment is heat stable up to approx. 1000°C. At temperatures that go beyond this, there is a grain size growth and thus a color shift. |
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General Info
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Published | ||
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Jun 12, 2022 |
Last Edited | ||
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Jun 12, 2022 |
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Chemicals |
