Abstract
The enthalpies of mixing have been determined by a direct mixing technique for LiF + NaF, NaF + KF, and LiF + KF at 1360 K, and for LiF + KF also at 1176 K. The results are in reasonable agreement with values previously reported by Holm and Kleppa (LiF + NaF, NaF + KF, LiF + KF) and by Gilbert (LiF + KF), but differ significantly from recent data of Macleod and Cleland. The new results for LiF + KF show that the enthalpies of mixing in this system become less negative with increasing temperature; the maximum value of ΔC p M is about +0.8 cal th K −1 mol −1 near mole fraction 0.5 in the range 1176 to 1360 K. A simple correlation between ΔC p M and − ΔH M is proposed.
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