Abstract
The microstructure and electrical properties of varistor ceramics, which are composed of (99.5– x– y)ZnO+ xPr 6O 11+ yCoO+0.5Dy 2O 3 system, were investigated with Pr 6O 11/CoO mole ratio ( x/ y=0.5/0.5, 0.5/1.0, 1.0/0.5, 1.0/1.0) and sintering temperature. The density of varistor ceramics with Pr 6O 11=1.0 was almost constant with sintering temperature, whereas it was increased noticeably in Pr 6O 11=0.5. Increasing Pr 6O 11 content enhanced the densification for any CoO content and the density was greatly affected not by CoO content but by Pr 6O 11 content. The varistor ceramics with Pr 6O 11/CoO=0.5/1.0 exhibited a higher nonlinearity than any other composition ratios. In particular, the varistor ceramics sintered at 1350 °C. exhibited the best electrical properties, with nonlinear exponent of 37.8, leakage current of 7.6 μA, and dissipation factor of 0.059. It was found that Pr 6O 11/CoO ratio greatly affects various characteristics of varistor ceramics.
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