Improvement of sintering, nonlinear electrical, and dielectric properties of ZnO-based varistors doped with TiO2
Desouky Osama A1, †, , Rady K E2
       

(a) The SEM image of sample A3, (b) the EDAX of the above image showing the distribution of Bi2O3, TiO2, MnO2 with ZnO and Co3O4 intergranular accumulation.