Abstract
The electric resistance R of the samples of a Na0.88Li0.12Nb0.5Ta0.5O3 ferroelectric ceramic composition with the electron conductivity increased by thermal reduction in vacuum exhibit anomalous temperature variation of the posistor type in the temperature region of 350–400°C, where the nonreduced samples exhibit transition to the state with superionic conductivity. The R(T) anomaly was observed during the electrical measurements both in air and in vacuum. The effect depends on the degree of material reduction and the measurement frequency, reaching 4–5 orders of magnitude for the dc measurements in samples with maximum conductivity. It is suggested that the R(T) anomaly is localized in the near-electrode layer and is related to a mutual influence of the electron and ion transport processes.
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