Abstract
The microstructure and electrical characteristics of ZPCD (ZnO-<TEX>$Pr_{6}O_{11}$</TEX>-CoO-<TEX>$Dy_2O_3$</TEX>) -based varistor ceramics were investigated with various <TEX>$Pr_{6}O_{11}$</TEX>/CoO ratios and sintering temperatures. The density of varistor ceramics with <TEX>$Pr_{6}O_{11}$</TEX>=1.0 was almost constant with sintering temperature, whereas it was increased noticeably in <TEX>$Pr_{6}O_{11}$</TEX>=0.5. Increasing <TEX>$Pr_{6}O_{11}$</TEX> content enhanced the densification for any CoO content and the density was greatly affected not by CoO content but by <TEX>$Pr_{6}O_{11}$</TEX> content. The varistor ceramics with <TEX>$Pr_{6}O_{11}$</TEX>/CoO=0.5/l.0 exhibited a higher nonlinearity than any other composition ratios. In particular, the varistor ceramics sintered at <TEX>$1350^{\circ}C$</TEX> exhibited the best electrical properties, with nonlinear exponent of 37.8, leakage current of 7.6 <TEX>${\mu}$</TEX>A, and tan <TEX>$\delta$</TEX> of 0.059.
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