Low Frequency Dispersion in Ionic Crystals Containing Foreign Ions

Abstract

The anomalous electrical response at low frequencies previously observed in pure ionic crystals has been studied in ionic crystals containing foreign ions. Measurements of the dielectric loss at one kc as a function of temperature have been made on four salts with a variety of foreign ions at several concentrations. A number of loss maxima were observed which depended in height on the concentration of the foreign ion and the heat treatment of the crystal; and, in their position on the temperature scale on the nature of the salt and foreign ion. An interpretation of the results in terms of defect pairs of various types is presented.