On the Criterion for Dielectric Breakdown in Ionic Crystals

Abstract

Previous theories on the criterion for electronic breakdown in ionic crystals are reviewed, in particular those of Fröhlich and Heller. It is shown that the ideas proposed by Heller are based on insufficient examination of the physical picture of breakdown, and the validity of Fröhlich's criterion is vindicated so long as electron-lattice collisions determine the distribution function. However, for the relatively high densities of conduction electrons existing just before breakdown the effect of electron-electron collisions may well be more important than the effect of electron-lattice collisions in determining the distribution function.