Effect of Pr-Fe doping on dielectric and modulus properties of SrTiO3 films

Pr-Fe co-doped SrTiO3 films are prepared by the metal organic deposition method on (111) Pt/Ti/SiO2/Si substrates. Their dielectric and electric modulus behaviors are investigated in the temperature range of 30-500 °C with different measuring frequency of 102∼106 Hz. A typical ferroelectric relaxation phase transition is shown and its location shifts to the low temperature with the increase of Fe content. The imaginary parts of electric modulus M″ exhibits the variable relaxation process with different Fe content, which is relation with OVs, PNRs and phase transition, and the possible causes of relaxation behavior dependence are analyzed in detail.