Room-Temperature Multiferroic Properties and Local Structures of the Mn-Doped and (Pb, Mn)-Codoped BiFeO3 |
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Authors: | Yongtao Li Hongguang Zhang Xueguang Dong Qi Li Wei Chen Hao Liu Xiaopeng Ge Xing’ao Li Chenglin Dong Shanling Ren |
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Affiliation: | 1. College of Science, Nanjing University of Posts and Telecommunications, Nanjing, 210046, P.R. China 2. Department of Physics, Southeast University, Nanjing, 211189, P.R. China
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Abstract: | The Mn-doped and the (Pb, Mn)-codoped BiFeO3 polycrystalline samples are prepared by a sol–gel method. The X-ray diffraction patterns manifest that all samples are in single phase and a lattice structural transformation appears during doping process. Compared with Mn-doped BiFeO3, the magnetic property of (Pb, Mn)-codoped BiFeO3 is enhanced and ferroelectric polarization decreases. The results of XAFS indicate that the bond length of Fe–O shortens due to doping Mn ions into BiFeO3, which results in the increase of magnetic property. Pb ion doping makes the valence state of Mn ion change, rather than Fe ion, and induces the occurrence of Mn4+–O–Fe3+ antiferromagnetic coupling, which decreases the magnetic property of the Bi0.95Pb0.05Fe0.95Mn0.05O3 sample. |
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