Dielectric Constant, Density, and Enthalpy of Transition of Cyclohexane and Neopentane at 500 Atmospheres

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Abstract
A cell has been described for the simultaneous measurement of the dielectric constant and volume changes at the phase transition of solids at low temperatures and pressures up to 500 atm. The dielectric constants of the high temperature phase of cyclohexane and neopentane at 10 kHz increase with decreasing temperature according to the Clausius–Mossotti equation. The low temperature solid phase of both non-polar substances has considerably high shear strength and it is suggested that the dielectric data of these substances in the literature may have considerable errors. The enthalpies of fusion and solid–solid transition at 500 atm have been calculated from the experimental results.

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