The Origin of Enhanced Room Temperature Ferromagnetism in Ba Doped BiFeO3

Abstract

Bi0.74Ba0.30FeO3 and Bi0.74Ba0.30Fe0.95Ti0.05O3 ceramics have been synthesized by a tartaric acid modified sol–gel method. Bi0.74Ba0.3FeO3 has a pseudo-tetragonal structure, while triclinic distortion was induced by the 0.05 Ti substitution from the Rietveld refinements on the X-ray diffraction patterns. The addition of Ti significantly reduced the leakage current. Compared with the remnant magnetization (M r=0.001 emu/g) and coercivity (H c=80 Oe) of pure BiFeO3, the M r and H c of Bi0.74Ba0.3FeO3 are strongly enhanced to 0.16 emu/g and 4.2 kOe, respectively. The Ti substitution has little influence on the magnetic properties. From the temperature-dependent magnetization and differential scanning calorimeter measurements, we conclude that the enhanced ferromagnetism in Ba doped BiFeO3 might be attributed to the trace impurity of BaFe12O19.

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Acknowledgements

This work is supported by the National Natural Science Foundation of China (51172044), the National Science Foundation of Jiangsu Province of China (BK2011617), the Fundamental Research Funds for the Central Universities (NS2012110), National Key Projects for Basic Researches of China (2010CB923404), by NCET-09-0296, the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry.

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Correspondence to Lirong Luo.

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Luo, L., Luo, W., Yuan, G. et al. The Origin of Enhanced Room Temperature Ferromagnetism in Ba Doped BiFeO3 . J Supercond Nov Magn 26, 3309–3313 (2013). https://doi.org/10.1007/s10948-013-2176-6

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Keywords

  • Multiferroic
  • BiFeO3
  • Ferromagnetism
  • Impurity