nickel oxide
Nickel oxide (II) is a common inorganic compound, which is an oxide of bivalent nickel. Its chemical formula is NiO. It is a green powder. It is widely used in life and is also used to prepare high purity (> 99.98% nickel)
Physical property
Nickel oxide is a green powdery solid. The melting point is 1980 20℃. The density is 6.67g/cm3. Insoluble in water, insoluble in alkali liquor, alkaline oxide, soluble in acid and ammonia. [1]
Nickel oxide crystal form nickel oxide crystal form
The entanglement of the internal structure of nickel oxide results in the carrier unable to flow, resulting in nickel oxide being an insulator and non-conductive. [2]
In addition, the physical properties of nickel oxide also change with the change of preparation temperature. With the increase of preparation temperature, its density and resistance increase, while solubility and catalytic activity decrease. [2]
The crystal structure is cubic, NiO has a crystal structure similar to sodium chloride, i.e. rock salt structure, in which there are six nearest O's around each Ni, oxygen atoms form a regular octahedron, and nickel atoms are in its center; And vice versa, oxygen atoms are also in the octahedron formed by nickel atoms. The whole crystal can be regarded as a staggered formation of Ni with face-centered cubic arrangement and O with face-centered cubic arrangement. [3]
Chemical property
If used and stored in accordance with specifications, it will not decompose, there is no known dangerous reaction, and contact with halogen, hydrogen peroxide, hydrogen sulfide, etc. is avoided.
Nickel monoxide prepared at low temperature has chemical activity, while nickel monoxide prepared by high temperature calcination at 1000℃ is green yellow with little activity.
The color turns yellow when heated. When heated to 400℃, it absorbs oxygen from air to generate Ni2O3, and when heated to 600℃, it is reduced to NiO. Soluble in acid and ammonia. Insoluble in water. [4]
The reaction formula is: 4NiO+O2==400℃==2Ni2O3, 2Ni2O3==600℃==4NiO+O2.
use
1, used as enamel adhesive and colorant, ceramic and glass pigments. In the production of magnetic materials, it is used to produce nickel-zinc ferrite, etc., as well as used as raw material for nickel salt production, nickel catalyst and application in metallurgy and kinescope.
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