Reorientation of Impurity-Vacancy Dipoles in Cesium Halides

TLDR: In this paper, a plot of log f m (f m being the peak frequency) against 1/T gives a straight line, the slope of which yields the value of activation energy for the jump of a bound cation vacancy.

Abstract: Dielectric loss measurements of lead and cadmium doped cesium halides have been reported in the temperature range 90–180°C. One loss peak which is attributed to the jump of vacancy in the six equivalent n n positions, has been observed in the plot of tan δ versus frequency isothermals. The plot of log f m ( f m being the peak frequency) against 1/ T gives a straight line, the slope of which yields the value of activation energy for the jump of a bound cation vacancy. The activation energy thus obtained from dielectric loss data compares well with those obtained from conductivity measurements on these crystals.