Abstract
FILMS of nickel deposited on rock salt by spluttering in residual gas or argon, show an unexpected structure on removal from the rocksalt and examination by the cathode ray diffraction method. As is well known, the normal structure of nickel is face centred cubic, as found both by X-ray and electron diffraction methods. The new structure turns out to be hexagonal, the values of the axes being c = 4·06 A., a = 2·474 A. ratio 1·64, which is near enough to the ratio 1·633 for closest packing. Nickel thus resembles cobalt in crystallising in both cubic and hexagonal closest packing. The density calculated from the above axes is 8·86, in good agreement with that of the metal in bulk. The structure is thus different from an hexagonal form found by Bredig and Allolio (Zeit. f. Phys. Chem.,, 126, p. 53; 1927) by spluttering in hydrogen. The latter had a density of only 7·04 and is probably a hydride. The above is, I believe, the first case of a new crystal form found by electron diffraction.
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THOMSON, G. The Crystal Structure of Nickel Films. Nature 123, 912 (1929). https://doi.org/10.1038/123912b0
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DOI: https://doi.org/10.1038/123912b0
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