Abstract
WHEN an excess of concentrated ammonia is gently added to a concentrated solution of nickel nitrate in water, crystals of blue (somewhat violet) octahedra are obtained, the correct composition of which was first determined by Wyckoff1. The crystal is cubic ; the size of its unit cell and the number of molecules contained in the cell were established by Wyckoff by the Laue method of X-ray analysis. But his proposed structure does not appear to be satisfactory, according to Kracek and his co-workers2, who concluded that the nitrate group NO3 might be rotating in the crystal and possess spherical symmetry.
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References
Wyckoff, R. W. G., J. Amer. Chem. Soc., 44, 1260 (1922).
Kracek, F. C., Hendricks, S. B., Posujak, E., NATURE, 128, 410 (1931).
Bradley, A. J., and Rodgers, J. W., Proc. Roy. Soc., A, 144, 340 (1934).
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YÜ, S. Evidence of Abnormal Behaviour of NO3 in the Cubic Crystal, Ni(NO3)2.6NH3. Nature 141, 158–159 (1938). https://doi.org/10.1038/141158a0
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DOI: https://doi.org/10.1038/141158a0
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