-oxide-3D-vdW.png) | |
| Names | |
|---|---|
| IUPAC name Cobalt(II) oxide | |
| Other names Cobaltous oxide Cobalt monoxide | |
| Identifiers | |
3D model (JSmol) | |
| ChemSpider |
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| ECHA InfoCard | 100.013.777 |
| EC Number |
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| RTECS number |
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| UNII | |
| UN number | 3288 |
| |
| |
| Properties | |
| CoO | |
| Molar mass | 74.9326 g/mol |
| Appearance | olive or gray powder |
| Odor | odorless |
| Density | 6.45 g/cm3[1] |
| Melting point | 1,933 °C (3,511 °F; 2,206 K) |
| insoluble in water[2] | |
| +4900.0·10−6 cm3/mol | |
| Structure | |
| cubic,cF8 | |
| Fm3m, No. 225 | |
| Hazards | |
| GHS labelling: | |
  | |
| Warning | |
| H302,H317,H410 | |
| P260,P280,P284,P301+P310+P330,P304+P340+P310,P342+P311,P403+P233 | |
| NFPA 704 (fire diamond) | |
| Flash point | Non-flammable |
| Lethal dose or concentration (LD, LC): | |
LD50 (median dose) | 202 mg/kg |
| Safety data sheet (SDS) | ICSC 1551 |
| Related compounds | |
Otheranions | Cobalt(II) sulfide Cobalt(II) hydroxide |
Othercations | Iron(II) oxide Nickel(II) oxide |
Related compounds | Cobalt(II,III) oxide Cobalt(III) oxide |
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |
Cobalt(II) oxide is aninorganic compound that has been described as anolive-green[3] orgray[4]solid. It is used extensively in theceramics industry as an additive to create blue-coloredglazes andenamels, as well as in the chemical industry for producing cobalt(II) salts. A related material iscobalt(II,III) oxide, a black solid with theformula Co3O4.
CoO crystals adopt thepericlase (rock salt) structure with a lattice constant of 4.2615 Å.[5]
It isantiferromagnetic below 289 K.[6]
Cobalt(II) oxide is prepared by oxidation of cobalt powder with air or by thermal decomposition ofcobalt(II) nitrate or the carbonate.[3][4]
Cobalt(II,III) oxide decomposes to cobalt(II) oxide at 950 °C:[7]
It may also be prepared by precipitating the hydroxide, followed by thermal dehydration:[citation needed]
As can be expected, cobalt(II) oxide reacts with mineral acids to form the corresponding cobalt salts:[citation needed]
Cobalt(II) oxide has for centuries been used as a coloring agent onkiln fired pottery. The additive provides a deep shade of blue namedcobalt blue. The band gap (CoO) is around 2.4 eV.[citation needed]It also is used incobalt blue glass.
