The intensity of the dielectric absorption in alkali halides containing divalent cations

Abstract

The intensity of the dielectric absorption arising from the rotation of divalent ion-vacancy pairs in alkali crystals has been measured over a range of concentrations in the crystals NaCl:Ca²⁺, NaCl:Mn²⁺, KCl:Sr²⁺ and LiF:Mg²⁺ and found to agree with the value calculated from simple theory. In NaCl:Mn²⁺ (and in some other systems) the absorption is slightly broader than a Debye curve. This is discussed in terms of the relative occupancy by vacancies of nearest neighbour and next nearest neighbour sites to the impurity ions.