ChemicalBook > Product Catalog > Inorganic chemistry > Oxides and peroxides > Metal oxide > COBALT(III) OXIDE BLACK
COBALT(III) OXIDE BLACK
COBALT(III) OXIDE BLACK Chemical Properties
- Melting point:895 °C (dec.)(lit.)
- Density 6.11 g/mL at 25 °C(lit.)
- form powder
- Water Solubility insoluble H2O; soluble conc acids [HAW93]
- EPA Substance Registry SystemCobalt oxide (Co2O3) (1308-04-9)
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
COBALT(III) OXIDE BLACKSupplierMore
- Company Name:Beijing dtftchem Technology Co., Ltd.
- Tel:13031183356 010-60275820-
- Company Name:BeiJing Hwrk Chemicals Limted
- Tel:18600197062 0757-86329057-
- Company Name:JinYan Chemicals(ShangHai) Co.,Ltd.
- Company Name:Shanghai Hanhong Scientific Co.,Ltd.
- Tel:021-54302127 021-54306202-
- Company Name:Chengdu XiYa Chemical Technology Co., Ltd.