Cobaltous Oxide

Title: Cobaltous Oxide
CAS Registry Number: 1307-96-6
Molecular Formula: CoO
Molecular Weight: 74.93
Percent Composition: Co 78.65%, O 21.35%
Literature References: Prepn: Amiel et al., Compt. Rend. 259, 3512 (1964); Wilke, Z. Anorg. Allg. Chem. 330, 164 (1964). Toxicity study: Smyth et al., Am. Ind. Hyg. Assoc. J. 30, 470 (1969). Review: de Bie, Doyen, Cobalt 15, 3-13; 16, 3-15 (1962).
Properties: Powder, or cubic or hexagonal crystals. Color varies from olive green to red, depending on the particle size, but the commercial material is usually dark grey and contains about 76% Co. mp ~1935°. d 5.7 to 6.7, depending on method of prepn. Readily absorbs O2 even at room temp. Practically insol in water. Sol in acids or alkalies. Easily reduced to Co by C or CO. Reacts at high temperatures with silica, alumina, zinc oxide to form pigments. LD50 orally in rats: 1.70 g/kg (Smyth).
Melting point: mp ~1935°
Density: d 5.7 to 6.7
Toxicity data: LD50 orally in rats: 1.70 g/kg (Smyth)
NOTE: The commercial oxides are usually not definite chemical compds but mixtures of the cobalt oxides.
Use: In pigments for ceramics; glass coloring and decolorization; oxidation catalyst for drying oils, fast-drying paints and varnishes; prepn of cobalt-metal catalysts, Co powder for binder in sintered tungsten carbide; in semiconductors.
Cobaltous Phosphate Cobaltous Potassium Sulfate Cobaltous Sulfate Cobaltous Sulfide Cobaltous Thiocyanate

Cobalt(II) oxide
Cobalt(II) oxide
Identifiers
CAS number 1307-96-6 YesY
PubChem 9942118
ChemSpider 8117730 YesY
EC number 215-154-6
UN number 3288
RTECS number GG2800000
Jmol-3D images Image 1
Image 2
Properties
Molecular formula CoO
Molar mass 74.9326 g/mol
Appearance black powder
Odor odorless
Density 6.44 g/cm3 [1]
Melting point 1,933 °C; 3,511 °F; 2,206 K
Solubility in water insoluble in water[2]
Structure
Crystal structure cubic, cF8
Space group Fm3m, No. 225
Hazards
MSDS ICSC 1551
EU Index 027-002-00-4
EU classification Harmful (Xn)
Dangerous for the environment (N)
R-phrases R22, R43, R50/53
S-phrases (S2), S24, S37, S60, S61
Flash point Non-flammable
LD50 202 mg/kg
Related compounds
Other anions Cobalt(II) sulfide
Cobalt(II) hydroxide
Other cations Iron(II) oxide
Nickel(II) oxide
Related compounds Cobalt(II,III) oxide
Cobalt(III) oxide
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Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references

Cobalt(II) oxide or cobalt monoxide is an inorganic compound that appears as olive-green to red crystals, or as a greyish or black powder.[3] It is used extensively in the ceramics industry as an additive to create blue colored glazes and enamels as well as in the chemical industry for producing cobalt(II) salts.