Order–Disorder Transformation in Potassium Graphite


DURING an X-ray diffraction investigation of the potassium graphites1, we concluded that the reduction in potassium concentration within the intercalate layer, which occurs on passing from stage 1 (C8K) to stage n (C12nK), is accompanied by a loss of long range order within the layer. A study of the stage 2 compound has now shown that this disordered intercalate structure (form I) transforms reversibly to an ordered state (form II) at a temperature of about −175°C.

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  1. 1

    Nixon, D. E., and Parry, G. S., Brit. J. Appl. Phys. (in the press).

  2. 2

    Moore, A. W., Ubbelohde, A. R., and Young, D. A., Proc. Roy. Soc., A, 280, 153 (1964).

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    Herold, A., Bull. Soc. Chim., 999 (1955).

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    Nixon, D. E., Parry, G. S., and Ubbelohde, A. R., Proc. Roy. Soc., A, 291, 324 (1966).

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PARRY, G., NIXON, D. Order–Disorder Transformation in Potassium Graphite. Nature 216, 909–910 (1967). https://doi.org/10.1038/216909a0

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