Leite, E. R.Varela, José Arana [UNESP]Longo, Elson [UNESP]2014-05-202014-05-201992-07-01Journal of Applied Physics. Woodbury: Amer Inst Physics, v. 72, n. 1, p. 147-150, 1992.0021-8979http://hdl.handle.net/11449/32173The phenomenon of electrical degradation in ZnO varistors was studied by application of high-intensity current pulses. A wave shape of 8 X 20-mu-s and rectangular waves of 1 and 2 ms were used. The degradation was estimated by reference electric-field variation and by Schottky voltage barrier deformation. The results showed that current pulses reduce both the height and the width of the barrier voltage. It was also observed that the donor density N(d) did not change but the surface states density N(s) decreased with degradation.147-150engArtigo10.1063/1.352175WOS:A1992JB34700023Acesso abertoWOSA1992JB34700023.pdf