کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1464088 | 989656 | 2010 | 6 صفحه PDF | دانلود رایگان |

The effect of CuO doping on the microstructure and electrical properties of Pr6O11 varistors was investigated. Samples were prepared by conventional ceramic techniques, and were sintered at 1150 °C in air for 2 h. The microstructure was investigated by scanning electron microscopy (SEM). The phases and chemical composition were analyzed by X-ray diffraction (XRD) and energy dispersive spectroscopy (EDS). The results indicated that CuO can promote the densification of the Pr6O11-based varistors to 95.8% of the theoretical density. CuO forms a solid solution with Pr6O11 up to 0.5 mol%, above which Pr2CuO4 precipitates in the grain boundary. From the I–V measurements, minor CuO doping can improve the nonlinear electrical properties. A further increase in CuO content induces a reduction in the nonlinear electrical properties due to the consumption of absorbed oxygen on the grain surfaces.
Journal: Ceramics International - Volume 36, Issue 5, July 2010, Pages 1511–1516