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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.)
- 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)
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
- Magnesium oxide Cerium dioxide Sulfur trioxide Chromium(III) oxide Zirconium dioxide Sodium oxide Nickel oxide Barium oxide Molybdenum(IV) oxide Diantimony trioxide Potassium chromate FERROUS SULFATE VANADIUM(IV) OXIDE IRON NICKEL OXIDE Holmium Oxide Gallium(III) oxide Nickel(II) oxide Erbium(III) oxide
COBALT(III) OXIDE BLACKSupplierMore
- Company Name:Beijing dtftchem Technology Co., Ltd.
- Tel:13031183356 010-60275820-
- Company Name:BeiJing Hwrk Chemicals Limted
- Tel:18516978288 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.