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Effect of dopant-induced defects on structural, electrical, and enhanced ferromagnetism and magnetoelectric properties of Dy and Sr co-doped BiFeO3

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Abstract

In this report, [Bi0.95Dy0.05FeO3 (BDFO), Bi0.95−xDy0.05SrxFeO3, x = 0.05 (BDSFO-1), and Bi0.95−xDy0.05SrxFeO3, x = 0.10 (BDSFO-2)] ceramics are prepared by the solid-state reaction. Crystal structures of Dy3+ and Sr2+- substituted BFO samples are confirmed as rhombohedral with the space group (R3c) through X-ray diffraction analysis and evidenced with Reitveld refinement. The band gap energy is 2.14, 2.16, and 2.18 eV for BDFO, BDSFO-1 and BDSFO-2, respectively. Characteristic modes in Raman spectra of the samples are denoted as A1-1, A1-2, and A1-3 and E, which are favorable to induce ferroelectricity of BFO. Remnant polarization measured with respect applied electric field (P–E) hysteresis loops of the samples increases with increasing Sr2+ concentration of BDFO. Sr2+-doped BFO samples represent the higher leakage current density than the Dy3+-doped BFO, which is attributed that the Sr2+ ions create the oxygen vacancies in BFO. Ferromagnetic ordering and enhanced saturation magnetizations are observed in magnetic measurements of BDSFO-1 and BDSFO-2 samples at room temperature. Furthermore, characteristics of the magneto-electric coupling were examined in through magneto-capacitance of Sr2+ and Dy3+-substituted BiFeO3 samples.

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Acknowledgements

This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and Future Planning (NRF-2018R1A2B6005179). The [Bi0.95−xDy0.05SrxFeO3 (x = 0.00, 0.10, and 0.20)] ceramics were supplied by the Functional Phosphor Bank at Pukyong National University, South Korea.

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Authors and Affiliations

  1. Department of Physics, Pukyong National University, Busan, 48513, South Korea

    Muniyandi Muneeswaran, Jae-Won Jang & Jung Hyun Jeong

  2. Advanced Materials Laboratory, Mechanical Engineering, University of Chile, Beauchef 851, Santiago, Chile

    Muniyandi Muneeswaran & Ali Akbari-Fakhrabadi

  3. Advanced Functional Materials Laboratory, Department of Physics, National Institute of Technology, Tiruchirappalli, 620 015, India

    N. V. Giridharan

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  1. Muniyandi Muneeswaran
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Correspondence to Jae-Won Jang or Jung Hyun Jeong.

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Muneeswaran, M., Jang, JW., Jeong, J.H. et al. Effect of dopant-induced defects on structural, electrical, and enhanced ferromagnetism and magnetoelectric properties of Dy and Sr co-doped BiFeO3. J Mater Sci: Mater Electron 30, 7359–7366 (2019). https://doi.org/10.1007/s10854-019-01048-y

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