Abstract
The electrical properties and their stability of varistor ceramics composed of ZnO–Pr6O11–CoO–Cr2O3–Er2O3 systems were investigated as a function of Er2O3 content and sintering time. The varistor ceramics sintered for 1 h exhibited high nonlinear properties, with the nonlinear exponent close to 50. But the others, except for the varistor doped with 0.5 mol % Er2O3, exhibited very poor stability against d.c.-accelerated aging stress due to very low density. On the other hand, the varistors sintered for 2 h exhibited a more or less low nonlinear exponent, compared with those for 1 h, whereas their stability for d.c. stress was greatly improved. In particular, the varistor doped with 2.0 mol % exhibited not only high nonlinearity, with the nonlinear exponent of 47.4 and a leakage current of 1.8 μA, but also excellent stability, in which under DC accelerated aging stress such as 0.95 V1 mA/150 °C/12 h, the variation rate of varistor voltage, nonlinear exponent, and leakage current are −0.54 %, −4.41 %, and +155.56 %, respectively.
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Nahm, CW. Electrical properties and stability against DC accelerated aging stress of ZPCCE-based varistor ceramics. Journal of Materials Science: Materials in Electronics 15, 29–36 (2004). https://doi.org/10.1023/A:1026236803798
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DOI: https://doi.org/10.1023/A:1026236803798