Chromium Sesquioxide CAS# 1308-38-9
Chromium oxide is a basic inorganic chemical raw material. Its chemical name is chromium trioxide, Cr2O3. It belongs to the trigonal crystal system. If a hexagonal unit cell is taken, the unit cell parameters are 4.960x 4.960??13.584 and the axial ratio is 4.473. Cr2O3 has a ??-Al2O3 structure. This rigid crystal is composed of oxygen ions that are closely packed and M3+ ions fill the octahedral gaps formed by these close packings.It is known that the ionic radii of Cr3+ and O2- are 0.069nm and 0.132nm respectively, and the ratio of positive and negative ionic radii is 0.52, in the range of 0.414~0.732. Therefore, the coordination number of Cr3+ is 6, so it is in the octahedral gap.
Chromium Sesquioxide CAS# 1308-38-9
| Chromium(III) oxide Basic information |
| Product Name: | Chromium(III) oxide |
| Synonyms: | cipigmentgreen17;cosmetichydrophobicgreen9409;cosmeticmicroblendchromeoxide9229;dichromiumtrioxide;greenchromeoxide;
greenchromicoxide;greenchromiumoxide;greenoxideofchromium |
| CAS: | 1308-38-9 |
| MF: | Cr2O3 |
| MW: | 151.99 |
| EINECS: | 215-160-9 |
| Product Categories: | Inorganics;INORGANIC & ORGANIC CHEMICALS;Dyes and Pigments;Inorganic chemistry;dyestuff metal chrome;metal oxide |
| Mol File: | 1308-38-9.mol |
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| Chromium(III) oxide Chemical Properties |
| Melting point | 2435 ??C |
| Boiling point | 4000 ??C |
| density | 5.21 |
| refractive index | 2.551 |
| Fp | 3000??C |
| storage temp. | Room Temperature |
| solubility | Insoluble in all solvents |
| form | powder |
| color | Pale to dark green |
| Specific Gravity | 5.22 |
| Odor | at 100.00?%. odorless |
| Water Solubility | Insoluble |
| Crystal Structure | Trigonal |
| Merck | 14,2234 |
| Exposure limits | NIOSH: IDLH 25 mg/m3; TWA 0.5 mg/m3 |
| Stability: | Stable. |
| CAS DataBase Reference | 1308-38-9(CAS DataBase Reference) |
| NIST Chemistry Reference | Chromium(iii) oxide(1308-38-9) |
| EPA Substance Registry System | Chromium(III) oxide (1308-38-9) |
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