Multiferroic and optical properties of Pr-substituted bismuth ferrite ceramics

Pr-doped BiFeO3 ceramics with x0.20 were synthesized by a solid-state reaction method. X-ray diffraction patterns of these samples have shown single-phase rhombohedral structure with R3c space group symmetry. Remanent magnetization has been found to increase with Pr concentration. Magnetization versus temperature plots for x=0.0 and 0.20 exhibit a broad magnetic anomaly at around 375 and 393 degrees C, respectively, indicating the Neel temperature T-N. Dielectric constant (E-r) versus T plots exhibit dielectric anomalies at around 375 degrees C in these materials, which may correspond to the transition temperature T-N. The photoluminescence spectra of these ceramics exhibit band-edge emission in the blue region and defect-related emission in the green region. The FTIR spectra show two broad vibrational modes at 430 and 560cm(-1).