Ionic conductivity of some alkaline earth halides

The ionic conductivity above and below the melting temperature has been measured for the fluorides, chlorides, and bromides of calcium, strontium, and barium and for magnesium chloride. The observed behavior is of three types: I (MgCl₂, CaCl₂, CaBr₂, BaBr₂), there is an increase in conductivity of several orders of magnitude on melting; II (BaCl₂, SrBr₂), there is a solid-solid transition accompanied by a large increase in conductivity with little subsequent change on melting; and III (CaF₂, SrF₂, BaF₂, SrCl₂), the conductivity of the solid is continuous and changes only slightly on melting.