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Abstract
Effect of sintering time on ac conduction has been investigated at different frequencies over a wide range of temperatures. Results have been discussed in the light of different conduction mechanisms. Variation of frequency exponent, ‘n’ (σ = A f n) with temperature has been studied. Owing to its variation with temperature, conduction behavior may be attributed to correlated barrier hoping (CBH) mechanism. Frequency exponent n, which is degree of correlation among charge carriers, found to increase with sintering time. Variation of activation energy with sintering time and frequency has also been studied in detail. Activation energy is observed to decrease with increase in both sintering time and frequency.