Space-charge-limited current in lithium disilicate glass

Abstract

A simple model was presented for describing the time dependence of the transient electric current in a glass. The model states that on the current versus time curve there is a region in which the current I changes with time t exponentially, as ln I 0/ I = t/ τ, and the constants I 0 and τ, defined respectively as an initial current and a time constant, should follow the identical temperature dependences to yield the activation energy for conduction. The model was checked by electrical measurements on a lithium disilicate glass made at an applied field of about 50 V/cm or less and in the temperature range of 50–150°C, and the activation energy for conduction was deduced to be 17.1 kcal/mol. Disagreement between this and the literature-cited values of about 14 kcal/mol was discussed.