Letter | Published:

Dielectric Dispersion in Crystalline Di-isopropyl Ketone

Nature volume 158, page 619 (02 November 1946) | Download Citation



DIPOLAR rotation is well known to occur in a number of organic crystals, for example, d-camphor1 and cyclopentanol2, and in ice3,4 far below the melting point. The dielectric behaviour of these substances is remarkable in that solidification is only shown as a minor discontinuity of the polarization curve, and it may be said that such compounds do not freeze dielectrically at their macroscopic freezing point. In some cases, dipolar rotation stops at a transition taking place at a lower temperature. Whether or not dispersion is observed in the crystalline state should depend on the frequency used.

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    and , J. Amer. Chem. Soc., 57, 2079 (1935).

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    , Helv. Phys. Acta, 5, 126 (1932).

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    , Trans. Farad. Soc., 42, 495 (1946).

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    , Proc. Roy. Soc., A, 158, 403 (1937).

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  1. British Rubber Producers' Research Association, 48 Tewin Road, Welwyn Garden City, Herts. Sept. 30.



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