Cobalt(II) oxide

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Cobalt(II) oxide
Image:Cobalt(II) oxide.jpg
IUPAC name Cobalt(II) Oxide
Other names Cobaltous oxide,
Cobalt monoxide,
Cobaltous monoxide
Identifiers
CAS number [1307-96-6]
RTECS number GG2800000
Properties
Molecular formula CoO
Molar mass 74.93 g/mol
Appearance Black powder
Density 6.1 g/cm3
Melting point

1933°C (2206 K)
Solubility in water practically insoluble in water,
soluble in strong acids
Hazards
Main hazards Respiratory tract inflammation
possibly carcinogenic
NFPA 704
0
2
0
 
R-phrases 22 43 50-53
S-phrases (2-)24-37-60-61
Related compounds
Other anions Cobalt(II) chloride
Related compounds Cobalt(III) oxide
Except where noted otherwise, data are given for
materials in their standard state
(at 25 °C, 100 kPa)
Infobox disclaimer and references

Cobalt(II) oxide is an olive-green to red cystals, or greyish or black powder, that 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. CoO crystals have periclase (rock salt) structure with a lattice constant of 4.2615Å[1].

Cobalt(II) oxide is a product of cobalt(III) oxide decomposing at 950 °C:[citation needed][2]

2 Co3O4 → 6 CoO + O2

[edit] Ceramics

Cobalt(II) Oxide has for centuries used as a coloring agent on kiln fired pottery, the earliest examples go back to 12th century German pottery.[3]The additive provides a deep shade of blue named Cobalt Blue.

[edit] References

  1. ^ Phys. Rev. B 35 6847 http://link.aps.org/abstract/PRB/v35/p6847
  2. ^ Process for making a cobalt oxide catalyst,James, Leonard E. (Richmond, VA) Crescentini, Lamberto (Chester, VA) Fisher, William B. (Chester, VA) 1983. http://www.freepatentsonline.com/4389339.html
  3. ^ Zamek, Jeff: "A Problem With Cobalt?" Ceramics Today http://www.ceramicstoday.com/articles/zamek_cobalt.htm
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