摘要
C-V characteristics of ZnO-based ceramic structures used in manufacturing high-voltage and low-voltage varistors of different chemical compositions and manufacturing techniques have been investigated.A correlation between the intensity of electric field corresponding to transition of the C-V characteristics to the negative capacitances and average sizes of grains of a varistor structure has been established.Obtained data have been interpreted with the use of notions of the percolation theory of electric conductivity.The Shklovskii-De Gennes model has been used.It has been shown that on the highly nonlinear segment of C-V characteristics of a varistor structure,the size of an infinite cluster are limited to several intercrystallite potential barriers.This result is observed in all kinds of investigated varistor ceramics.
