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Nickel tungstate
Chemical compound From Wikipedia, the free encyclopedia
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Nickel tungstate is an inorganic compound of nickel, tungsten and oxygen, with the chemical formula of NiWO4.
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Preparation
Nickel tungstate can be prepared by the reaction of nickel(II) nitrate and sodium tungstate:[5]
- Ni(NO3)2 + Na2WO4 → NiWO4 + 2 NaNO3
Nickel tungstate can also be prepared by the reaction of nickel(II) oxide and tungsten(VI) oxide.[6]
It can also be obtained by the reaction of ammonium metatungstate and nickel(II) nitrate[7] or from the reaction of sodium tungstate, nickel(II) chloride and sodium chloride.[8]
Nickel tungstate undergoes a phase transition at 700 °C.[5]
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Properties
Nickel tungstate is a light brown, odourless solid that is insoluble in water.[2] The amorphous form is green and the polycrystalline form is brown.[5] It crystallizes in the wolframite crystal structure of the monoclinic crystal system with space group P2/c (No. 13).[9][8] The compound is antiferromagnetic.[10][11]
Applications
Nickel tungstate has no commercial uses. It has been examined as a photocatalyst, in humidity sensors, and in dielectric resonators. It is also considered as a "promising" cathode material for asymmetric supercapacitors.[1][12]
Other compounds
Nickel tungstate forms compounds with ammonia, such as NiWO4·2NH3·H2O which are cyan crystals,[13] NiWO4·4NH3 which are green crystals,[14] NiWO4·5NH3·H2O as dark blue crystals[13] or anhydrous NiWO4·6NH3 which is crystalline purple, while the octahydrate of hexamine is dark blue.[14]
References
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