Abstract
IT has been shown by one of us1 that, at ordinary temperatures, the structure of nickel oxide is slightly deformed from face-centred cubic symmetry. Later work2 proved that at − 180° C. an increase in the rhombohedral deformation occurs. On the other hand, it was found that the departure from cubic symmetry vanishes at a temperature of about 200° C.
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References
Rooksby, H. P., Nature, 152, 304 (1943).
Rooksby, H. P., Acta Crystallographica, 1, 226 (1948).
Lonsdale, K., and Smith, H., J. Sci. Instr., 18, 133 (1941).
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TOMBS, N., ROOKSBY, H. Structure of Monoxides of some Transition Elements at Low Temperatures. Nature 165, 442–443 (1950). https://doi.org/10.1038/165442b0
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DOI: https://doi.org/10.1038/165442b0
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