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Previous work (Müller 1937) on long-chain ketones has shown that the dielectric polarization rises from a low value to a maximum as the tem­perature of the solid approaches the melting-point. This rise takes place in a temperature interval of about 20° C. The characteristic feature is the rapidly increasing gradient of the polarization/temperature curve. The increase goes parallel with a correspondingly large expansion of the crystal lattice (Müller 1932, 1937), and the question therefore arises to what extent the two phenomena are linked together. The problem dealing with this question is investigated in the present work.The substance, instead of being allowed to expand freely, as it was in the previous investigation, is now enclosed in a steel container where it is kept at constant volume. The effect of this constraint upon the polarization/temperature curve is very striking, as is shown later. Apparatus

The dielectric polarization of a long chain ketone at constant volume and variable temperature