Abstract
AbstractWith the help of the solid solution (Mg,Fe)O, where Fe‐ions are the dilute species, we investigate the behaviour of a ternary ionic crystal under a d.c. electric current load. The transport equations of the ions and the electronic defects predict that even with reversible electrodes demixing, and in particular decomposition of the compound will occur if the applied d.c. current density is sufficiently high. These predictions are illustrated by appropriate experiments. In this context several additional phenomena are discussed: The internal oxidation of AgBr and the internal reduction of yttria stabilized zirconia. All the compounds mentioned were placed in a galvanic cell, and the internal reactions which then could be observed were driven by the electric field in this cell.
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