Chemical elements
    Physical Properties
      Nickel Fluoride
      Nickel Dichloride
      Double Nickel Chlorides
      Nickel Dibromide
      Nickel Di-iodide
      Nickel Chlorate
      Nickel Perchlorate
      Nickel Bromate
      Nickel Iodate
      Tri-nickel Suboxide
      Nickel Suboxide
      Nickel Monoxide
      Nickel Dihydroxide
      Nickelo-nickelic Oxide
      Nickel Dioxide
      Nickel Subsulphide
      Nickel Monosulphide
      Nickel Sesquisulphide
      Tri-nickel Tetrasulphide
      Nickel Disulphide
      Nickel Tetrasulphide
      Nickel Sulphite
      Nickel Thiosulphate
      Nickel Dithionate
      Nickel Sulphate
      Nickel Subselenide
      Nickel Selenide
      Nickel Sesquiselenide
      Nickel Selenite
      Nickel Sesquitelluride
      Nickel Tellurite
      Nickel Chromate
      Nickel Dichromate
      Double Nickel Chromates
      Nickel Molybdate
      Nickel Nitride
      Nickel Azoimide
      Nickel Nitrite
      Nickel Nitrate
      Di-nickel Phosphide
      Nickel Sesquiphosphide
      Nickel Diphosphide
      Nickel Triphosphide
      Nickel Hypophosphite
      Nickel Phosphite
      Nickel Metaphosphate
      Nickel Orthophosphate
      Nickel Pyrophosphate
      Nickel Thio-orthophosphate
      Nickel Thiopyrophosphite
      Nickel Thiopyrophosphate
      Tri-nickel Diarsenide
      Nickel Arsenide
      Nickel Diarsenide
      Nickel Arsenite
      Nickel Orthoarsenate
      Nickel Antimonide
      Nickel Antimonate
      Nickel Thioantimonite
      Nickel Vanadate
      Nickel Carbide
      Nickel Tetracarbonyl
      Nickel Carbonate
      Nickel Monocyanide
      Nickel Cyanide
      Nickel Thiocyanate
      Nickel Thiocarbonate Hexammoniate
      Nickel Subsilicide
      Nickel Orthosilicate
      Nickel Monoboride
      Nickel Borates
    PDB 1a5n-1g2a
    PDB 1g3v-1mn0
    PDB 1mro-1s9b
    PDB 1scr-1xmk
    PDB 1xu1-2cg5
    PDB 2cqz-2jih
    PDB 2jk8-2v4b
    PDB 2vbq-3c2q
    PDB 3c6c-3h85
    PDB 3hdp-3kvb
    PDB 3l1m-3o00
    PDB 3o01-4ubp
    PDB 8icl-9ant

Nickelo-nickelic Oxide, Ni3O4

Tri-nickel Tetroxide, Nickelo-nickelic Oxide, Ni3O4, results when nickel chloride is subjected to prolonged heating at 440° C. in moist oxygen. In appearance it is grey and metallic.

The oxide may also be obtained in the dihydrated condition, Ni3O4.2H2O or NiO2.2NiO.2H2O, by fusing sodium peroxide with metallic nickel and removing the alkali by thorough washing, when it is formed as dark crystals which dissolve in acids yielding salts of divalent nickel. Density 3.412 at 32° C. On heating to redness nickel monoxide is formed.

Nickel Sesquioxide, Nickelic Oxide, or Nickelous Nickelite, Ni2O3 or NiO.NiO2. Frequent references occur in the literature to this oxide, the analogue of ferric and cobaltic oxides. It would appear, however, from the researches of Bellucci, that the substance originally believed to have the above composition is in reality the dioxide, NiO2, or a mixture of this dioxide with the monoxide (vide infra), and that the sesquioxide has not as yet been obtained. These conclusions were arrived at as the result of studying the action of oxidising agents on nickel sulphate in alkaline solution. It was found that the degree of oxidation depended both on the nature of the oxidising medium and upon the rapidity of oxidation. No arrest was found corresponding to the sesquioxide. Hofmann and Hiendlmaier found that, on burning potassium in nickel vessels exposed to air, black prisms were formed to which they ascribed the formula NiO.NiO2.K2O. On washing thoroughly with water, raven-black metallic crystals, of empirical composition Ni2O5H4, were left. These readily oxidised organic matter, and the authors suggested the formula NiO.NiO2.2H2O. The sodium salt, NiO.2NiO2.Na2O, has also been prepared. Upon hydrolysis it yields the same hydrated oxide, Ni3O4.2H2O.

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