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 1649.    JUZA, R., AND SACHSZE, W.  [Metal Amides and Metal Nitrides.  XII.  The System Nickel-Nitrogen.]  Ztschr. Anorg. Chem., vol. 251, 1943, pp. 201-212; Chem. Abs., vol. 37, 1943, p. 6175.

       Nickel nitride Ni₃N, theoretical N content 7.37%, was prepared by passing a rapid stream of NH₃ over 10-20 mg. of Ni powder, prepared from Ni(CO)₄, at 445° for 3 hr.  It was also prepared from NiF₂.2 NH₄F and NiBr₂ but there is no particular advantage in using the halides.  The nitride is tested for metallic Ni contamination by testing in a magnetic field of 11,000 gausses strength.  Ni₃N is a black-gray material, easily ground in an agate mortar, and is stable to O₂ and moisture.  NaOH solution has no action either hot or cold.  Acid solutions and acids react slowly to explosively, depending on concentration and temperature.  The density at 25° was 7.66 which is lower than the calculated density of 7.91 from x-ray data.  X-rays showed hexagonal close packing of the Ni atoms, with lattice constants, a 2.664, c 4.298, and c a 1.613.  The structure agrees with the ε-phase of Fe₂N.  The N atoms are located at the center of an octahedron of Ni atoms, at a distance of 1.877 from the Ni atoms, and 3.423 from the other N atoms.  The N atoms are interstitial and the structure differs completely from that of Cu₃N.  From an x-ray study it is estimated that the solubility of N₂ in Ni does not exceed 0.07% by weight.