From work on the ionic conductivity of LiF‐MgF 2 mixed crystals the solubility of MgF 2 in solid LiF has been derived at temperatures from 400 to 700° C. The solubility is of the order of magnitude of several percent. The rules given by Goldschmidt for the miscibility of ionic substances have been extended. Apart from the similarity in ionic radius which was emphasized by Goldschmidt , the gain in polarization energy upon solution of the solute also has to be considered. This polarization energy is particularly important in cases where the solute contains ions with a valency different from that of the solvent ions.
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Y. Haven (1950) studied this question.
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