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Physical and chemical properties and uses of nickel oxide

wallpapers Industry 2021-04-06
Physical properties of nickel oxide
The appearance of nickel oxide is a green powder. The melting point is 1980±20°C. The density is 6.67g/cm3. Nickel oxide is insoluble in water, insoluble in lye, and is alkaline oxide, soluble in acid and ammonia. In addition, the physical properties of nickel oxide also change with the change in preparation temperature. With the increase of preparation temperature, its density and resistance increase, and solubility and catalytic activity decrease. The crystal structure of NiO is a cubic system. The crystal structure of NiO is similar to that of sodium chloride, that is, rock salt structure, in which there is six nearest Os around each Ni, oxygen atoms form a regular octahedron, and nickel atoms are in the center.
 
The chemical properties of nickel oxide
Nickel monoxide produced at low temperature is chemically active, while nickel monoxide produced by high-temperature calcination at 1000 ℃ is greenish-yellow with low activity. The color turns yellow when heated. When heated to 400°C, it absorbs oxygen in the air to generate Ni2O3, and at 600°C, it is reduced to NiO. Soluble in acid and ammonia. Insoluble in water.
 
Uses of nickel oxide
1. Used as an adhesive and coloring agent for enamel, and as a pigment for ceramics and glass. In the production of magnetic materials, it is used to produce nickel-zinc ferrite, etc., as well as raw materials for the production of nickel salts, nickel catalysts, and applications in metallurgy and picture tubes. Used as electronic component materials, catalysts, enamel coatings, and battery materials.
2. NiO can be used to make nickel elements by reduction, but be careful not to use CO to reduce NiO under unprotected conditions. This is because Ni and CO react to form highly toxic and volatile nickel tetracarbonyl Ni(CO)4, which is difficult to detoxify. , Prone to danger.
3. Used to make nickel salt, ceramics, glass, catalysts, magnetic materials, etc.
4. Used as electronic component material and battery material.

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