Pippard Relations Close to the Melting Point in the Premelting Region of Hexadecane

Abstract EN

We examine here the validity of the Pippard relations close to the melting point in the premelting region of hexadecane.

For this verification, we analyze the observed data for the thermal expansivity αp obtained for various pressures at constant temperatures of 302 and 325 K in this system.

By calculating the isothermal compressibility κT and the specific heat Cp in the same pressure region of the premelting region of hexadecane, we obtain that Cp varies linearly with αp and also that αp varies linearly with κT for this system.

This indicat es that some molecular organic compounds, such as solid hexadecane studied here, can exhibit λ-phase transitions prior to melting which are expected to verify the Pippard relations.