Chromium(III) oxide

For chromium(VI) oxide, see Chromium trioxide.
Chromium(III) oxide
Names
Other names
Chromium sesquioxide
Chromia
Chrome green
Eskolaite
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.013.783 Edit this at Wikidata
EC Number
  • 215-160-9
11116
RTECS number
  • GB6475000
UNII
UN number 3077
  • InChI=1S/2Cr.3O checkY
    Key: QDOXWKRWXJOMAK-UHFFFAOYSA-N checkY
  • InChI=1/2Cr.3O/rCr2O3/c3-1-5-2-4
    Key: QDOXWKRWXJOMAK-LUXALHLMAR
  • O=[Cr]O[Cr]=O
Properties
Cr2O3
Molar mass 151.9904 g/mol
Appearance light to dark green, fine crystals
Density 5.22 g/cm3
Melting point 2,435 °C (4,415 °F; 2,708 K)
Boiling point 4,000 °C (7,230 °F; 4,270 K)
insoluble
Solubility in alcohol insoluble in alcohol, acetone, acids
+1960.0×10−6 cm3/mol
2.551
Structure[1]
Corundum
R3c (No. 167)
a = 495 pm, c = 1358 pm
Thermochemistry
81 J·mol−1·K−1
−1128 kJ·mol−1
Hazards
GHS labelling:
GHS07: Exclamation markGHS08: Health hazard
Danger
H302, H317, H319, H360
P201, P202, P261, P264, P270, P272, P280, P281, P301+P312, P302+P352, P305+P351+P338, P308+P313, P321, P330, P333+P313, P337+P313, P363, P405, P501
NIOSH (US health exposure limits):
PEL (Permissible)
 TWA 1 mg/m3[2]
REL (Recommended)
 TWA 0.5 mg/m3[2]
IDLH (Immediate danger)
 250 mg/m3[2]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
checkY verify (what is checkY☒N ?)

Chromium(III) oxide (or chromia) is an inorganic compound with the formula Cr
2O
3. It is one of the principal oxides of chromium and is used as a pigment. In nature, it occurs as the rare mineral eskolaite.

  1. ^ Abdullah, M. M.; Rajab, Fahd M.; Al-Abbas, Saleh M. (2014). "Structural and optical characterization of Cr2O3 nanostructures: Evaluation of its dielectric properties". AIP Advances. 4 (2). AIP Publishing: 027121. Bibcode:2014AIPA....4b7121A. doi:10.1063/1.4867012. ISSN 2158-3226.
  2. ^ a b c NIOSH Pocket Guide to Chemical Hazards. "#0141". National Institute for Occupational Safety and Health (NIOSH).