Abstract
Conductivities of impurity doped ß- and ß″-alumina ceramics were measured by means of the frequency dispersive method, and the effects of the impurities, K + and Ca 2+ ions, on bulk and grain-boundary conduction were separately determined. Although ß- and ß″-aluminas are structurally very similar, their behavior to the impurities were considerably different; i.e. the differences in the effects of K + on bulk conduction and those of Ca 2+ on grain-boundary conduction were especially noticeable.
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