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Sintering and grain growth of Pr 6 O 11 -based ZnO varistors were investigated in detail over a range of temperature and holding time. The grain growth kinetics in the Zn–Pr–Co–Mn–O system was studied using the simplified phenomenological grain growth kinetics equation: Gn−G0n =K 0 texp(−Q/RT) together with the physical properties of the sintered samples. From 1050°C to 1300°C,...
The microstructure and electrical properties of the ZPCMY varistor ceramics composed of ZnO–Pr 6 O 11 –Co 3 O 4 –MnCO 3 –Y 2 O 3 systems sintered at temperature of 1200–1300°C were investigated. The addition of Y 2 O 3 led to the decrease of the densification and the slight improvement of the electrical properties. The varistor...
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