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New High-pressure Polymorph of Sodium Fluoride


RECENTLY, Piermarini and Weir1 found a high-pressure transition (from the face-centred cubic to the cæsium chloride-type structure) between 9 and 15 kbar in anhydrous rubidium fluoride. Somewhat later transitions were also found for cæsium fluoride and potassium fluoride2. Bridgman3 found no evidence for high-pressure polymorphs in any of the alkali fluorides and noted that the fluorides appeared to be anomalous in this respect. For the case of sodium fluoride Bridgman4 stated that “the shearing curve definitely has a maximum near the end of the pressure range, leading to the expectation of a transition. Because of the interest which any transition in this particularly simple compound would have, unusually careful exploration was made with the volume apparatus. Runs were made at 25°, 125°, 150°, and 175° C. It is certain that there is no transition with the large volume change associated with the change from face centred to body centred, which is the transition anticipated”.

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  1. 1

    Piermarini, G. J., and Weir, C. E., J. Chem. Phys., 37, 1887 (1962).

  2. 2

    Weir, C. E. (personal communication).

  3. 3

    Bridgman, P. W., Phys. Rev. 48, 893 (1935).

  4. 4

    Bridgman, P. W., Proc. Amer. Acad. Arts Sci., 72, 45 (1937).

  5. 5

    Kennedy, G. C., and Newton, R. C., Solids under Pressure (McGraw-Hill Book Co., Inc., New York, 1963).

  6. 6

    Jayaraman, A., Klement, W., Newton, R. C., and Kennedy, G. C., J. Phys. Chem. Solids, 24, 7 (1963).

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