A Co-operative Transition in a Mixed Ketone Shown by a Change of Dielectric Constant

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IN a paper on the dielectric properties of dipolar solids, Fröhlich1 considers the theory of second-order transitions in long-chain ketones. Starting from the crystal structure of these materials, he shows the possibility of co-operative transitions in the solid, and derives an expression for the behaviour of the dielectric constant at such a transition. This theory is derived for pure ketones ; but so far no ketone has been found to show a transition of the type in question, the energy conditions being apparently unfavourable. However, such a transition has now been found in a binary mixture of a ketone and a paraffin, namely, 25 per cent of C6H13COC11H23 with 75 per cent of C17H36.

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  1. 1

    Fröhlich, H., Proc. Roy. Soc., A, 185, 399 (1946).

  2. 2

    Müller, A., Proc. Roy. Soc., A, 138, 514 (1932).

  3. 3

    Ubbelohde, A. R., Trans. Farad. Soc., 34, 292 (1938).

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DANIEL, V. A Co-operative Transition in a Mixed Ketone Shown by a Change of Dielectric Constant. Nature 163, 725–726 (1949) doi:10.1038/163725b0

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