Two kinds of anomalous dielectric phenomena in Pr-doped SrTiO3 ceramics: The Debye-like and ferroelectric-like behaviors

Sr1−xPrxTiO3 ceramics (0.00≤x≤0.07) were investigated over a broad temperature and frequency range for their interesting dielectric behaviors. Two kinds of anomalous dielectric behaviors were observed, i.e. Debye-like relaxation behaviors for the specimens of x≤0.03 and ferroelectric-like dielectric peaks appearing in x≥0.04. According to our experiments, the Debye-like relaxation, as well as the CDC behavior (εr∼3000) detected in x=0.01, was closely related to the IBLC mechanism. The anomalous dielectric peaks appearing in x≥0.04 were ascribed to an electron transportation process instead of a TF–P.