Colossal dielectric constant and relaxation behaviors in Pr:SrTiO3 ceramics

Sr 1 − x Pr x TiO 3 ceramics (0.00≤x≤0.03) were prepared by a traditional solid-state reaction method. Two relaxation processes (marked as A and B) of the Sr0.09Pr0.01TiO3 ceramics were investigated by analyzing the Ea values obtained from the Arrhenius law. Colossal dielectric constant (CDC) was first obtained in Sr0.09Pr0.01TiO3 ceramics, whose permittivity was up to 3000 (1 kHz, room temperature), greater than that of pure SrTiO3 ceramics and samples with more Pr addition (x=0.02 and 0.03). This CDC behavior was related to the internal barrier layer capacitance mechanism.