Paper Title:
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.

  Info
Periodical
Edited by
Yiwang Bao, Li Tian and Jianghong Gong
Pages
382-385
DOI
10.4028/www.scientific.net/AMR.177.382
Citation
H. Feng, Z. J. Peng, Z. Q. Fu, W. Yue, X. Yu, C. B. Wang, L. H. Qi, H. Z. Miao, "Optimization of Sintering Temperature and Doping Level of Cr2O3 in ZnO-Pr6O11-Based Varistor Ceramics", Advanced Materials Research, Vol. 177, pp. 382-385, 2011
Online since
December 2010
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