Abstract
Abstract Polycrystalline samples of (Na, Sr) β″-alumina were produced by ion exchange in suitable melts from Na β″-alumina. The curves, giving the extent of exchange as a function of the Sr content of the melt under equilibrium conditions agree well for the polycrystalline materials and a single crystal. The conductivity dependence upon the Sr content of the melt suggests that the motion of sodium ions determine the total conductivity in a wide composition range. A narrower range of mixed conductivity follows. At high extents of exchange the Sr 2+ ions are the conducting species. The latter conclusion is confirmed by the results of the determination of the resistance of a cell in which a Sr β″-alumina tube with closed end is in contact with the same melt on both sides. The resistance measurements were made by applying a voltage of triangular shape at different sweep rates and recording the current-voltage characteristics.
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