Abstract

The repulsive energy in sodium chloride and potassium chloride crystals has been evaluated and related to the lattice constant. The accuracy aimed at was ±0·2 kcal mole-1 but owing to some unidentified experimental error the accuracy claimed is only ±0·6 kcal mole-1 as compared with previous analyses in which the uncertainty is about ±2 kcal mole-1. The improvement has been achieved by critical evaluation of the experimental data, by the elimination of inaccuracies from the thermodynamic formulae and by carrying out the analysis at several specified temperatures.

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