Synthesis and Characterization of Mn-Doped BiFeO3 Nanoparticles

BiFeO3 is a multiferroic material showing antiferromagnetic ordering and ferroelectric behavior simultaneously. Here, Mn-doped BiFeO3 nanoparticles were synthesized up to 10% of Mn composition by a sol-gel process. The samples showed high crystallinity with no secondary phase up to 2% of Mn doping. A phonon peak at 1250 cm(-1) in undoped BiFeO3 showed anomalous intensity enhancement in the magnetically ordered phase below T-N = 643 K due to a spin-phonon coupling. This behavior was less pronounced in the Mn-doped samples, suggesting a suppression of magnetic ordering between Fe3+ spins by Mn doping.