Abstract
Polycrystalline Caβ-̋alumina was produced in a relatively gentle way by increasing stepwise the Ca content of (Na, Ca) β-̋ alumina in suitable mixtures of molten salts (Ca(NO3)2 and CaCl2). When determining the conductivity of Ca β-̋alumina as a function of temperature by the four-probe technique, an irreversible decrease of the conductivity was observed in subsequent measurements if the temperature during the first conductivity measurement was extended beyond 600°C. Impedance measurements on such samples demonstrated that the conductivity decrease was due to an increase of the contribution of the grain boundary resistivity to the total specific resistivity.
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