Synthesis of (Pb,Ni)-doped BiFeO_3 Multiferroic Systems via a Sol-gel Method and Their Magneto-electric Properties

摘要

Influence of Pb and Ni doping on the phase formation and magneto-electric properties of the BiFeO_3 perovskites were studied. The (Bi,Pb)FeO_3 and Bi(Fe,Ni)O_3 powders have been successfully synthesized via a sol-gel method employing natural iron sands as Fe~(3+) ion source of starting material. Both Pb and Ni doping decrease the phase formation of the BiFeO_3, while increase the secondary phase formation and lead to a phase transition. For the latter mentioned case, a structural transformation from rhombohedral to pseudocubic system was observed with the increasing Pb contents. Both weak ferromagnetism and ferroelectricity were observed form the related samples. As expected, the Ni doping has strengthened the magnetic properties.