A calorimetric study of liquid cesium–cesium chloride mixtures at 925 K

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Abstract
The enthalpies relative to 298 K of cesium, of cesium chloride, and of liquid cesium–cesium chloride mixtures have been measured at 925 K by a Calvet‐type twin calorimeter using a high‐precision digital integrator. From the results we have calculated the enthalpies of mixing for the cesium–cesium chloride mixtures at 925 K. The following empirical relation has been derived from a least squares treatment of the data: ΔHmix/x1x2= (36.42−16.04x2) ± 0.74 kJ mol−1. In this expression x1 and x2 represent the mole fractions of cesium chloride and of cesium, respectively. From the relative enthalpies of cesium chloride at 925 and at 910 K we determined the enthalpy of fusion to be 19.52±0.45 kJ mol−1. The excess Gibbs energies of mixing at 918 K have been derived from the recent cryoscopic data of Hsu and Nachtrieb, taking into account the partial enthalpies and the enthalpy of fusion of cesium chloride. The excess entropies were derived from the enthalpies and the excess Gibbs energies and show large positive values and strong asymmetry.

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