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Structural phase transition and multiferroic properties of Bi0.8A0.2Fe0.8Mn0.2O3 (A = Ca, Sr)

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Abstract

The multiferroic BiFeO3 and Bi0.8A0.2Fe0.8Mn0.2O3 (A = Ca, Sr) have been synthesized using direct mechanosynthesis. Detailed investigations were made on the influence of Ca–Mn and Sr–Mn co-substitutions on the structure change, electric and magnetic properties of the BFO. Rietveld refinement on the XRD pattern of the modified samples clarifies the structural transition from R3c:H (parent BiFeO3) to the biphasic structure (R3c: H + Pnma). Scanning electron micrographs confirmed the polycrystalline nature of the materials and each of the microstructure comprised of uniformly distributed grains with less porosity. The dielectric measurements reveal that enhancement in dielectric properties due to the reduction of oxygen vacancies by substitutional ions. Studies of frequency-dependence of impedance and related parameters exhibit that the electrical properties of the materials are strongly dependent on temperature, and bear a good correlation with its microstructure. The bulk resistance (evaluated from impedance studies) is found to decrease with increasing temperature for all the samples. The alternating current (ac) conductivity spectra show a typical signature of an ionic conducting system, and are found to obey Jonscher’s universal power law. Preliminary studies of magnetic characteristics of the samples reveal enhanced magnetization for Ca–Mn co-substituted sample. The magnetoelectric coefficient as the function of applied dc magnetizing field under fixed ac magnetic field 15.368 Oe is measured and this ME coefficient αME corresponds to induction of polarization by a magnetic field.

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Acknowledgements

The authors would like to acknowledge Mr. B. B. Palei, IMMT Bhubaneswar for the kind help in X-ray diffraction analysis (XRD), Dr. H. B. K. Sharma, Manipur University, Imphal for carrying the SEM measurements; and Dr. Santiranjan Shannigrahi, Scientist III, IMRE, Singapore for magnetic measurements.

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Authors and Affiliations

  1. Department of Physics, Institute of Technical Education and Research, Siksha ‘O’ Anusandhan University, Bhubaneswar, Odisha, 751030, India

    Jyoshna Rout & R. N. P. Choudhary

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  1. Jyoshna Rout
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Correspondence to Jyoshna Rout.

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Rout, J., Choudhary, R.N.P. Structural phase transition and multiferroic properties of Bi0.8A0.2Fe0.8Mn0.2O3 (A = Ca, Sr). Indian J Phys 92, 575–585 (2018). https://doi.org/10.1007/s12648-017-1123-y

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