Dielectric breakdown of single crystal strontium titanate

This paper describes the results of an experimental study of the electric strength of SrTiO₃ single crystals as a function of temperature, geometry, and duration of applied field. The results are somewhat anomalous when compared to simpler dielectrics such as the alkali halides. An unexpected thickness dependence was observed and the temperature dependence was opposite that predicted by the accepted theories of intrinsic breakdown and observed with the alkali halides. In addition the statistical scatter in the results shows a dependence on temperature and geometry. These anomalies can be qualitatively explained by considering the large electrostrictive strains produced at high fields and low temperature.