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Giant dielectric response and magnetoelectric behavior of 95BiFeO3–5BaTiO3 (95BFO–5BT) ceramics

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Abstract

A detailed study of electrical behavior of 95BiFeO3–5BaTiO3 (95BFO–5BT) ceramics through comprehensive analysis of temperature and frequency dependent dielectric behavior, ac impedance and magnetodielectric (MD) properties is reported here. Addition of insulating BaTiO3 into BiFeO3 have exhibited enhanced dielectric and ferromagnetic responses. The remnant polarization (Pr) was found to be 6 µC/cm2, while the dielectric constant was found to be very high (\(\varepsilon_{\text{r}}^{\prime }\) ≥ 102, for T ≥ 140 °C). Along with strong conductivity contribution to \(\varepsilon_{\text{r}}^{\prime }\), spectroscopic plots of \(\varepsilon_{\text{r}}^{\prime }\) revealed the Maxwell–Wagner type relaxation in the sample, which ultimately could have led to an apparent high \(\varepsilon_{\text{r}}^{\prime }\) in 95BFO–5BT ceramics. Origin of such a high \(\varepsilon_{\text{r}}^{\prime }\) in BFO–BT was further investigated using impedance spectroscopy. MD studies revealed the magneto-electric coupling in the ceramics. The MD studies along with anomaly in dielectric data near antiferromagnetic ordering temperature (TN = 170 °C) of BFO suggests the magnetic bearing on the electrical properties of 95BFO–5BT ceramics.

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Acknowledgments

We would like to thank Department of Metallurgical Engineering and Materials Science, CRNTS of IIT Bombay for extending all the characterization facilities viz. XRD, SEM, Dielectric, SQUID magnetometer etc.

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Authors and Affiliations

  1. Department of Physics, Sanmati Engineering College, SGB Amravati University, Amravati, India

    Rajesh R. Raut

  2. Department of Applied Physics, Laxminarayan Institute of Technology, RTM Nagpur University, Nagpur, India

    Paresh H. Salame

  3. Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay, Powai, Mumbai, 400076, India

    Paresh H. Salame, Jayant T. Kolte & Prakash Gopalan

  4. Department of Physics, Yashvantrao Chavan Arts and Science College, SGB Amravati University, Amravati, India

    Chandrakant S. Ulhe

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  1. Rajesh R. Raut
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  2. Paresh H. Salame
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  3. Jayant T. Kolte
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  4. Chandrakant S. Ulhe
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  5. Prakash Gopalan
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Correspondence to Paresh H. Salame or Jayant T. Kolte.

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Raut, R.R., Salame, P.H., Kolte, J.T. et al. Giant dielectric response and magnetoelectric behavior of 95BiFeO3–5BaTiO3 (95BFO–5BT) ceramics. J Mater Sci: Mater Electron 27, 730–737 (2016). https://doi.org/10.1007/s10854-015-3810-9

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  • DOI: https://doi.org/10.1007/s10854-015-3810-9

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