Effects of Mn Doping on Structural and Magnetic Properties of Multiferroic BiFeO3 Nanograins Made by Sol-gel Method

BiFeO3 is a multiferroic material that attracts attentions of many research groups due to its potential as being ferroelectric and ferromagnetic above room temperature. We have prepared both undoped- and Mn-doped BiFeO3 by sot-gel auto-ignition method. Doping of Mn has resulted in decreasing grain size from 60 to 32 nm. X-ray diffraction data show that the samples are pure and single-phase. Infrared measurements on BiFeO3 and Mn-doped BiFeO3 revealed intrinsic stretching vibrations of tetrahedral sites of Fe3+-O and of octahedral Bi3+-O as well. On the other hand, as the Mn concentration increases, the magnetic moment of BiFeO3 increases. It gives some suggestions in manipulating structural and magnetic properties of BiFeO3 by doping Mn.