Pianaro, S. A.Pereira, E. C.Bulhoes, LOSLongo, Elson [UNESP]Varela, José Arana [UNESP]2014-05-202014-05-201995-01-01Journal of Materials Science. London: Chapman Hall Ltd, v. 30, n. 1, p. 133-141, 1995.0022-2461http://hdl.handle.net/11449/31460The effect of Cr2O3 on the electrical properties of the multicomponent ZnO varistors was investigated using voltage-current curves and impedance spectroscopy. The structure and morphological modifications were analysed by X-ray diffraction and scanning electron microscopy, respectively. It was observed in samples with addition 0.1 mol% Cr2O3 that there was an improvement in the electrical properties of the varistors, but the increase in concentration had a deleterious effect on the potential barrier at the grain boundary. The excess Cr2O3 segregates at the grain-boundary region and increases the donor concentration, leading to a higher leakage current.133-141engArtigo10.1007/BF00352142WOS:A1995QB22500017Acesso restrito