Abstract
V<sub>2</sub>O<sub>5</sub>/Mn<sub>3</sub>O<sub>4</sub>/Nb<sub>2</sub>O<sub>5</sub> codoped zinc oxide varistor ceramics were sintered at a temperature range as low as 875~950℃. The voltage clamping characteristics of V<sub>2</sub>O<sub>5</sub>/Mn<sub>3</sub>O<sub>4</sub>/Nb<sub>2</sub>O<sub>5</sub> codoped zinc oxide varistor ceramics were investigated at a pulse current range of 1~50 A. The sintering temperature had a significant effect on clamp voltage ratio, which exhibits surge protection capabilities. The varistor ceramics sintered at 875℃ exhibited the best clamping characteristics, in which the clamp voltage ratio was 2.69 at a pulse current of 50 A. The varistor ceramics sintered at 900℃ exhibited the highest electrical stability, where = 3,824 V/cm (initial 3,909 V/cm), and E<sub>1 mA/cm<sup>2</sup></sub> = 27 (initial 39) after application of a pulse current of 100 A.
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