Nonlinear Ionic Conductivity in Alkali-Halide Crystals
- 1 March 1965
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 137 (5A), A1483-A1495
- https://doi.org/10.1103/physrev.137.a1483
Abstract
Nonlinearity in the electrical conductivity of NaCl and other alkali-halide crystals has been measured by a sensitive ac method. There is a component of current proportional to the cube of the voltage. The ratio of this component to the total current is about +, at an electric field of 2000 V/cm and a frequency of cps. This ratio is only slightly dependent on temperature, over a range which includes both extrinsic and intrinsic ionic conduction. The nonlinearity is about times what would be expected on the basis of simple ionic-conductivity theory. The type of dependence upon temperature, voltage, and specimen thickness, and the nondependence upon electrode material or preparation, favor an interpretation that the non-linearity is a bulk property. But there is a frequency dependence, at least at the lower temperatures, which favors an interpretation in terms of space charge or boundary layers. A number of conceivable mechanisms have been examined, but none seem to offer an explanation.
Keywords
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