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Revision as of 14:51, 1 June 2023 editScyrme (talk | contribs)Extended confirmed users19,963 edits GHS omission rule← Previous edit Latest revision as of 11:17, 5 March 2024 edit undo192.167.164.69 (talk) The antiferromagnetic temperature is now expressed in Kelvin degrees that is the measurement unit used from the article cited. In general, Kelvin degrees are used more often for magnetic order temperatures. 
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CoO crystals adopt the ] (]) structure with a lattice constant of 4.2615 Å.<ref>{{cite journal|doi=10.1103/PhysRevB.35.6847|title=Percolation effects and magnetic properties of the randomly diluted fcc system CopMg1-pO|year=1987|author1=Kannan, R. |author2=Seehra, Mohindar S. |journal=Physical Review B|volume=35|pages=6847–6853|issue=13|pmid=9940938 |bibcode=1987PhRvB..35.6847K }}</ref> CoO crystals adopt the ] (]) structure with a lattice constant of 4.2615 Å.<ref>{{cite journal|doi=10.1103/PhysRevB.35.6847|title=Percolation effects and magnetic properties of the randomly diluted fcc system CopMg1-pO|year=1987|author1=Kannan, R. |author2=Seehra, Mohindar S. |journal=Physical Review B|volume=35|pages=6847–6853|issue=13|pmid=9940938 |bibcode=1987PhRvB..35.6847K }}</ref>


It is ] below 16&nbsp;°C.<ref>{{cite journal|doi=10.1103/PhysRevB.24.419|title=Principal magnetic susceptibilities and uniaxial stress experiments in CoO|year=1981|author1=Silinsky, P. S. |author2=Seehra, Mohindar S. |journal=Physical Review B|volume=24|issue=1 |pages=419–423|bibcode=1981PhRvB..24..419S }}</ref> It is ] below 289&nbsp;K.<ref>{{cite journal|doi=10.1103/PhysRevB.24.419|title=Principal magnetic susceptibilities and uniaxial stress experiments in CoO|year=1981|author1=Silinsky, P. S. |author2=Seehra, Mohindar S. |journal=Physical Review B|volume=24|issue=1 |pages=419–423|bibcode=1981PhRvB..24..419S }}</ref>


==Preparation== ==Preparation==

Latest revision as of 11:17, 5 March 2024

"CoO" redirects here. For other uses, see COO (disambiguation).
Cobalt(II) oxide
Cobalt(II) oxide
Names
IUPAC name Cobalt(II) oxide
Other names Cobaltous oxide
Cobalt monoxide
Identifiers
CAS Number
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.013.777 Edit this at Wikidata
EC Number
  • 215-154-6
PubChem CID
RTECS number
  • GG2800000
UNII
UN number 3288
CompTox Dashboard (EPA)
InChI
  • InChI=1S/Co.O/q+2;-2Key: IUYLTEAJCNAMJK-UHFFFAOYSA-N
  • InChI=1/Co.O/rCoO/c1-2Key: IVMYJDGYRUAWML-NNYFCMOLAO
  • InChI=1/Co.O/q+2;-2Key: IUYLTEAJCNAMJK-UHFFFAOYAY
SMILES
  • =O
  • .
Properties
Chemical formula CoO
Molar mass 74.9326 g/mol
Appearance olive or gray powder
Odor odorless
Density 6.45 g/cm
Melting point 1,933 °C (3,511 °F; 2,206 K)
Solubility in water insoluble in water
Magnetic susceptibility (χ) +4900.0·10 cm/mol
Structure
Crystal structure cubic, cF8
Space group Fm3m, No. 225
Hazards
GHS labelling:
Pictograms GHS07: Exclamation markGHS09: Environmental hazard
Signal word Warning
Hazard statements H302, H317, H410
Precautionary statements P260, P280, P284, P301+P310+P330, P304+P340+P310, P342+P311, P403+P233
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 3: Short exposure could cause serious temporary or residual injury. E.g. chlorine gasFlammability 0: Will not burn. E.g. waterInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
3 0 0
Flash point Non-flammable
Lethal dose or concentration (LD, LC):
LD50 (median dose) 202 mg/kg
Safety data sheet (SDS) ICSC 1551
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
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). checkverify (what is  ?) Infobox references
Chemical compound

Cobalt(II) oxide is an inorganic compound that has been described as an olive-green or gray solid. 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. A related material is cobalt(II,III) oxide, a black solid with the formula Co3O4.

Structure and properties

CoO crystals adopt the periclase (rock salt) structure with a lattice constant of 4.2615 Å.

It is antiferromagnetic below 289 K.

Preparation

Cobalt(II) oxide is prepared by oxidation of cobalt powder with air or by thermal decomposition of cobalt(II) nitrate or the carbonate.

Cobalt(II,III) oxide decomposes to cobalt(II) oxide at 950 °C:

2 Co3O4 → 6 CoO + O2

It may also be prepared by precipitating the hydroxide, followed by thermal dehydration:

CoX2 + 2 KOH → Co(OH)2 + 2 KX
Co(OH)2 → CoO + H2O

Reactions

As can be expected, cobalt(II) oxide reacts with mineral acids to form the corresponding cobalt salts:

CoO + 2 HX → CoX2 + H2O

Applications

Cobalt(II) oxide has for centuries been used as a coloring agent on kiln fired pottery. The additive provides a deep shade of blue named cobalt blue. The band gap (CoO) is around 2.4 eV. It also is used in cobalt blue glass.

See also

References

  1. Lide, David R., ed. (2006). CRC Handbook of Chemistry and Physics (87th ed.). Boca Raton, Florida: CRC Press. ISBN 0-8493-0487-3.
  2. Advanced Search – Alfa Aesar – A Johnson Matthey Company Archived 2011-07-19 at the Wayback Machine. Alfa.com. Retrieved on 2011-11-19.
  3. ^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.
  4. ^ Donaldson, John Dallas; Beyersmann, Detmar (2005). "Cobalt and Cobalt Compounds". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a07_281.pub2. ISBN 978-3527306732.
  5. Kannan, R.; Seehra, Mohindar S. (1987). "Percolation effects and magnetic properties of the randomly diluted fcc system CopMg1-pO". Physical Review B. 35 (13): 6847–6853. Bibcode:1987PhRvB..35.6847K. doi:10.1103/PhysRevB.35.6847. PMID 9940938.
  6. Silinsky, P. S.; Seehra, Mohindar S. (1981). "Principal magnetic susceptibilities and uniaxial stress experiments in CoO". Physical Review B. 24 (1): 419–423. Bibcode:1981PhRvB..24..419S. doi:10.1103/PhysRevB.24.419.
  7. US 4389339, James, Leonard E.; Crescentini, Lamberto & Fisher, William B., "Process for making a cobalt oxide catalyst", published 1983-06-21 
Cobalt compounds
Cobalt(I)
Cobalt(II)
Cobalt(0,III)
Cobalt(II,III)
Cobalt(III)
Cobalt(III,IV)
Cobalt(IV)
Cobalt(V)
Oxygen compounds
Oxides
Mixed oxidation states
+1 oxidation state
+2 oxidation state
+3 oxidation state
+4 oxidation state
+5 oxidation state
+6 oxidation state
+7 oxidation state
+8 oxidation state
Related
Oxides are sorted by oxidation state. Category:Oxides
Categories: