Abstract
The usefulness of two a.c. techniques for conductivity measurements of polycrystalline solid electrolytes was assessed. For the comparison, two (Na, Sr)-ß″-alumina isomorphs were chosen. The two-probe data for the 10% exchanged material in the cell Pt/(Na, Sr)-ß″-alumina/Pt did not allow a simple extrapolation procedure to determine the bulk resistance (sum of crystal and grain boundary contributions). Simulation of the frequency dependence by analogue circuits, the parameters of which were obtained by optimization programmes, was not successful either. In contrast, the four-probe technique yielded useful values. Both techniques yielded similar conductivity values for the 70% exchanged material.
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