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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.