Oxide of cobalt 2822000000
Cobalt oxides are black to grayish-green crystalline powders, inorganic compounds. Insoluble in water and other solvents.
Cobalt (II) oxide CoO. It is obtained by heating metallic cobalt in air or by calcining Co (OH) 2 or CoCO3 without air. Dark green (almost black) crystals. Also known as cobalt oxide. It dissolves in dilute acids, slowly dissolves in hot alkalis. Oxidized by atmospheric oxygen when heated. Reduced with hydrogen. Density: 6.45 g / cm³. Melting point 1810 ° C.
Cobalt (II, III) oxide Co3O4. It is obtained by heating CoO kept in air or by calcining Co2O3. Gray-black crystals. Also known as cobalt oxide. It is a paramagnetic. Decomposes on heating. It dissolves slowly in concentrated acids. When fused with alkalis, it is oxidized by oxygen. Reduced with hydrogen. Density: 6.073 g / cm³. Melting point 900 ° C (decomposes).
Cobalt (III) oxide Co2O3. It turns out by oxidation of cobalt oxides with peroxides, bromine, potassium permanganate, or by precipitation with alkali from Co (III) salts. Black crystals. Decomposes in steps when heated. Oxidizes hydrochloric acid. Density: 5.18 g / cm³. Melting point 300 ° C (decomposes).
Cobalt oxide applications:
Cobalt oxide is quite often used in the glass industry. It is a stable and intense colorant (pigment) for glass products. Coloring with cobalt compounds is very constant and does not depend on the cooking mode. When using cobalt compounds in combination with other dyes, glasses with different shades can be obtained.
In the chemical industry, it is used as a catalyst for various chemical processes.
It is also used in the electrical industry for production capacitors, varistors and battery negative electrodes.