Dielectric Loss of Potassium Chloride

The dipolar contribution to the high-temperature dielectric loss of potassium chloride is shown to be unaffected by additions of strontium chloride that cause major changes in the frequency-independent volume conductivity, the cation vacancy concentration, and the anion vacancy concentration. The observations provide additional strong evidence that the dipoles responsible for the loss are vacancy pairs, since their concentration is not dependent on the strontium content of the crystal.