Black Nickel Oxide Definition Black Nickel Oxide refers to a specific form of nickel oxide characterized by its black color. Its chemical formula is NiO, identical to the more common green nickel oxide, but its distinct color arises from deviations in stoichiometry and crystal structure. It is a nickel(II) compound.
(black nickel oxide)
Production Synthesis typically involves the controlled calcination (heating in air) of nickel salts like nickel hydroxide Ni(OH)₂ or nickel carbonate NiCO₃ at elevated temperatures, usually between 600°C and 1000°C. Precise temperature control and atmosphere are crucial to achieve the desired black form and particle properties.
Key Properties Its defining feature is its black color, contrasting with the green of stoichiometric NiO. It possesses high surface area and significant electrical conductivity compared to the insulating green form. This conductivity stems from nickel cation vacancies within the crystal lattice. It exhibits good chemical stability and catalytic activity.
Primary Applications Its unique properties drive several important uses. It serves as a precursor material for manufacturing nickel salts and specialty nickel powders. It is a vital component in the production of nickel-iron (Edison) batteries and nickel-cadmium batteries, acting as the active cathode material. It finds use as a black pigment in ceramics, glass, and enamel frits, providing deep, stable coloration. Its catalytic properties make it useful in certain chemical reactions, including hydrocarbon reforming and oxidation processes. It is also employed in the production of ferrites.
(black nickel oxide)
Safety Considerations Handle Black Nickel Oxide with care. Nickel compounds are known skin sensitizers and respiratory irritants. Inhalation of dust poses health risks, including potential carcinogenicity associated with certain nickel compounds. Use appropriate personal protective equipment like gloves, safety glasses, and respirators in dusty conditions. Ensure good ventilation during handling and processing.
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