Abstract
The electron and hole conductivity of solid solutions was measured by dc polarization method using a modified Hebb–Wagner’s ion blocking cell at 973, 1073, 1173, and as a function of oxygen partial pressure. All measured data were fitted to the sum of the electron conductivity having a dependence and the hole conductivity having a dependence. At all temperatures, with increasing concentration, the electron conductivity drastically increased at –0.4 and slightly decreased at –1.0, leading to a maximum at –0.5. The logarithmic hole conductivity linearly increased with concentration for –1.
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