Cobalt sulfide

Cobalt sulfide
Identifiers
3D model (JSmol)
ChemSpider
EC Number
  • CoS: 215-273-3
RTECS number
  • CoS: GG332500
UNII
  • InChI=1S/Co.S
    Key: VRRFSFYSLSPWQY-UHFFFAOYSA-N
  • CoS: S=[Co]
Properties
CoxSy
Molar mass 90.9982 g/mol
Appearance black solid (alpha)
grayish-red crystals (beta)
Density 5.45 g/cm3
Melting point 1195 °C
0.00038 g/100 mL (18 °C)
Solubility slightly soluble in acid
+225.0·10−6 cm3/mol
Structure
octahedral (beta)
Hazards
GHS labelling:
Warning
H317, H410
P261, P272, P273, P280, P302+P352, P321, P333+P317, P362+P364, P391, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Cobalt sulfide is the name for chemical compounds with a formula CoxSy. Well-characterized species include minerals with the formulas CoS, CoS2, Co3S4, and Co9S8. In general, the sulfides of cobalt are black, semiconducting, insoluble in water, and nonstoichiometric. Cobalt sulfides can be prepared in the laboratory by treating an aqueous solution of cobalt(II) nitrate with hydrogen sulfide according to the following idealized equation:

Co(NO3)2 + H2S → CoS + 2HNO3
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