Otro
EFFECT OF CR2O3 ON THE ELECTRICAL-PROPERTIES OF MULTICOMPONENT ZNO VARISTORS AT THE PREBREAKDOWN REGION
Registro en:
Journal of Materials Science. London: Chapman Hall Ltd, v. 30, n. 1, p. 133-141, 1995.
0022-2461
10.1007/BF00352142
WOS:A1995QB22500017
Autor
Pianaro, S. A.
Pereira, E. C.
Bulhoes, LOS
Longo, Elson
Varela, José Arana
Resumen
The 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.