, Volume 22, Issue 3, pp 1019-1023

Non-ohmic behaviour of the binary ZnO-Nb2 O5 system

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Studies have been made of the non-ohmic behaviour of the system ZnO-Nb2O5, as a function of composition, in the range 0.1 to 0.5 wt % of Nb2O5 and sintering temperature varying from 900 to 1300° C. It is found that the non-linearity coefficient α varies with composition and sintering temperature. The maximum value of α(≅ 8) is achieved for the samples containing 0.2 wt% Nb2O5, sintered at 1100°C. These results are interpreted in terms of the variation of barrier height with composition.