The effect of static electric fields on protonic conductivity of ice single crystals

Abstract We observed a significant depression of the high-frequency conductivity σ∞, of ice under the action of a static electric field. The phenomenon is reversible; that is, σ∞ recovers during time τt which is dependent upon temperature. Experimental results for the dependence of σ∞, and Δσ∞ on temperature, sample thickness, electric field strength, time and electrode type are reported. Possible mechanisms are discussed. A rise in the recombination rate of protonic charge carriers on ice-metal interfaces is most probably responsible for the drop in σ∞, when an external electric field is applied. This rise is governed by diffusion and the drift fluxes of point defects.