, Volume 3, Issue 2, pp 137-155

Experimental determination of the volume change of pure salts and salt mixtures at their melting point

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Measurements of the melting temperature as a function of pressure for some pure salts (NaNO3, LiOH) and salt mixtures (Na2SO4-NaCl, NaNO2-NaNO3- KNO3, Li2SO4-NaCl, NaCl-MgCl2) are reported. The experiments were performed up to 250 MPa. From the melting curves, the slopes (dP/dT) m 0 at atmospheric pressure were determined. Finally, using the Clapeyron equation, with the enthalpy of melting taken from the literature, the volume change on melting at atmospheric pressure was determined for each compound.