Grain Size Dependence of Switching Properties of Ferroelectric BaTiO₃ Ceramics

Polarization reversal properties of BaTiO 3 (BT) ferroelectric ceramics at room temperature were studied. Two types of samples, having g 1 =1.5 µ m and g 2 =70 µ m grain size, were used. The grain size effect on the transient switching current was analysed and compared with the results of two theoretical models accounting for size effects: a dipole lattice model and a finite grain size model (FGM) that uses a Kolmogorov-Avrami (K-A) type statistical approach of polarization reversal.