THE PHASE-DIAGRAMS OF LINO3-NANO3 AND LINO3-KNO3 - THE BEHAVIOR OF LIQUID-MIXTURES

The binary phase diagrams of LiNO3-NaNO3 and LiNO3-KNO3 are studied by means of differential scanning calorimetry (DSC). For each phase diagram, the temperatures for solids and liquids have been determined and tabulated. Two models, based on regular solution theory, are employed to reproduce the phase diagrams. The first uses the values of the temperatures and enthalpies of fusion of the nitrates and the change in the heat capacity on melting, all of which are determined by differential scanning calorimetry. In the second model, we assume a variation of interaction energy with temperature to preserve regular solution treatment for the mixtures of alkaline nitrates.