Abstract
Studies have been made of the effect of process variables such as calcination, initial particle size, and postsinterin on density, microstructure, V‐I characteri stics, and energy ‐handling capability of a ZnO‐based composite: 87.325 wt% ZuO + 0.1% Nb2O5+ 3.5% Sb2O5+ 6% Bi2O3+ 0.55% CoO + 0.7% MnO2+ 0.9% Cr2O3+ 0.9% NiO + 0.025% Al(NO3)3. The nonlinear characteristics were found to be improved by the calcination of a ZnO + Nb2O5 mixture at 1200°C for 1h. The postsintering heat treatment was found to rejuvenate V‐I characteristics of the degraded sample to a greater extent. Further, the postsintered sample containing Nb2O5, prepared by using a calcined charge of particle size around 1 μm, was found to possess better V‐I characteristics and energy‐handling capability compared to the samples prepared without the calcination step.
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