Cairo University

MTPR Journal

 

EFFECT OF TEMPERATURE AND ADDITIVES ON THE ELECTRICAL PROPERTIES OF ZnO VARISTOR

& doi:
M.M.Saadeldin , M .Marawan and Mai Younis

Mixtures of ZnO and Ce6O11 as additive were prepared by solid state reaction from the calcined oxides with the following proportions 0.15, 0.25, 0.4 mol% . SEM revealed the presence of inter-granular phase. Phases developed were detected by XRD . XRD showed that no binary compound was formed. EDAX showed that cerium was detected in the ZnO grains confirming the XRD results. The conductivity is highly dependent on the microstructure of conducting grains surrounded by this insulating oxide barrier .The electrical conductivity was found to increase with the proportion of cerium oxide up to 0.25 mole then decreased.