Optimization of Sintering Temperature and Doping Level of Cr₂O₃ in ZnO-Pr₆O₁₁-Based Varistor Ceramics

Abstract:

The electrical properties of ZnO-Pr6O11-based varistors, which composed of (98.5-x)mol% ZnO +0.5mol% Pr6O11 +1.0mol% Co3O4 +xmol% Cr2O3 (x=0.0, 0.25, 0.5, 1.0, 2.0), were investigated as a function of sintering temperature in the range of 1250-1400°C for 2 h. At the same sintering temperature, the nonlinear exponents increased with the increase of Cr2O3 doping amount no more than 0.5mol%, but decreased with more Cr2O3 doped. With the same doping level of Cr2O3, the samples' varistor voltage decreased with the sintering temperature increased; and the samples' nonlinear exponents increased first with the sintering temperature increased to 1300 °C, but decreased when the temperature increased further. Conclusively, the electrical properties of ZnO-Pr6O11-Co3O4- Cr2O3 varistors were strongly affected by the sintering temperature and the doping level of Cr2O3, and the samples, doped with 0.5 mol% Cr2O3 and sintered at 1300 °C, exhibited the optimum nonlinear performance.

• Periodical: Advanced Materials Research (Volume 177)
• Pages: 382-385
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.177.382
• Online since: December 2010
• Authors: Hai Feng, Zhi Jian Peng, Zhi Qiang Fu, Wen Yue, Xiang Yu, Cheng Biao Wang, Long Hao Qi, He Zhuo Miao
• Keywords: Cr₂O₃ Doping, Electrical Properties, Sintering Temperature, ZnO Varistor

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