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 α_p obtained for various pressures at constant temperatures of 302 and 325 K in this system. By calculating the isothermal compressibility K_T and the specific heat C_p in the same pressure region of the premelting region of hexadecane, we obtain that C_p varies linearly with α_p and also that α_p varies linearly with K_T for this system. This indicat es that some molecular organic compounds, such as solid hexadecane studied here, can exhibit A-phase transitions prior to melting which are expected to verify the Pippard relations.
展开▼
