BaTiO3-ceramics electrical model based on intergranular contacts

This paper presents the contribution to the development of methods for electronic parameters recognition in BaTiO3-ceramics grains contacts. The model of intergranular impedance applied on two-grain contact is considered and it is established using the equivalent electrical scheme characterized by corresponding frequency characteristic. Globally, BaTiO3-ceramics sample is consisted of a huge number of mutually contacted grains which form clusters. For each of them, it is possible to establish the equivalent electrical model and for defined set of input parameters using symbolic analysis to obtain the frequency diagram. The support for the idea of establishing the electrical model based on intergranular contacts is founded in the fact that results obtained for the equivalent impedance of the cluster (for more then three grains) by symbolic simulation are similar to results measured on real BaTiO3-ceramics samples, which confirmed the validity of approach.