Abstract
The crystal radii of ions in alkaline earth chalcogenides have been calculated from the effective nuclear charges of isoelectronic ions. The ionic radii thus calculated are found to follow the polarizability—radius cubed relation, according to which the ratio of the electronic polarizability of an ion to the cube of its radius in the free state is nearly equal to that in the crystalline state. The interionic separations in alkaline earth chalcogenides and also AB 2 and A 2 B type crystals obtained from the ionic radii reported in the present paper agree closely with the experimental values.
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