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COBALT(III) OXIDE BLACK

Basic information Uses Preparation Reactions Safety Related Supplier
COBALT(III) OXIDE BLACK Basic information
COBALT(III) OXIDE BLACK Chemical Properties
  • Melting point:895 °C (dec.)(lit.)
  • Density 6.11 g/mL at 25 °C(lit.)
  • storage temp. Inert atmosphere,Room Temperature
  • form powder
  • Water Solubility insoluble H2O; soluble conc acids [HAW93]
  • EPA Substance Registry SystemCobalt oxide (Co2O3) (1308-04-9)
Safety Information
MSDS
COBALT(III) OXIDE BLACK Usage And Synthesis
  • UsesCOBALT(III) OXIDE BLACK is used as a pigment; for glazing porcelain and pottery; and for coloring enamels.
  • PreparationCOBALT(III) OXIDE BLACK is prepared by heating cobalt compounds at low temperatures in air.
  • ReactionsHeating with hydrogen, carbon or carbon monoxide reduces the oxide to cobalt metal.
    Co2O3 + 3H2→ 2Co + 3H2O
    Co2O3 + 3CO→ 2Co + 3CO
    2Co2O3 + 3C→ 4Co + 3CO2
    Strong heating in air converts cobalt(III) oxide to tricobalt tetroxide.
    Reactions with mineral acids produce their Co3+ salts:
    Co2O3 + 6HCl → 2CoCl3 + 3H2O
  • DescriptionNeither the oxide Co2O3 nor the hydroxide Co(OH)3 is definitely established. The oxidation of cobalt(II) hydroxide in aqueous suspension with, for example, peroxides, or the destruction of a cobalt(III) complex with alkali gives a brown or black powder Co2O3.aq which upon drying at 150° yields the monohydrate Co2O3.H2O; this is probably best formulated as CoO(OH). When heated further in attempts to dehydrate it, the "monohydrate" begins to evolve oxygen (as well as water) at 300° with the formation of black Co3O4. When heated to 100° in air cobalt(II) hydroxide is converted to dark brown CoO(OH).
  • Chemical PropertiesSteel-gray or black powder.Soluble in concentrated acids; insoluble in water.
  • Physical propertiesGrayish black powder; density 5.18 g/cm3; decomposes at 895°C; insoluble in water; soluble in concentrated mineral acids.
  • UsesCobaltic oxide (Co2O3) is also known as cobalt oxide or cobalt black. It is dark gray to black and is used in pigments, ceramic glazes, and semiconductors.
  • UsesPigment, coloring enamels, glazing pottery.
  • DefinitionSometimes incorrectly called cobalt peroxide.
  • PreparationCobalt(III) oxide is prepared by heating cobalt compounds at low temperatures in air.
  • Safety Profile: Moderately toxic by intraperitoneal and subcutaneous routes. Questionable carcinogen. Violent reaction with hydrogen peroxide. The oxide increases the sensitivity of nitroalkanes (e.g., nitromethane, nitroethane, and 1 nitropropane) to heat or detonation. See also COBALT COMPOUNDS.
COBALT(III) OXIDE BLACK Preparation Products And Raw materials
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