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Synthesis and study of structural, magnetic and microwave absorption properties in multiferroic BiFeO3 electroceramic

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Abstract

Phase pure nano-sized BiFeO3 (BFO) has been successfully prepared by citrate based sol–gel method. X-ray diffraction study revealed the formation of pure and well-crystallized BiFeO3 nano-crystallites in a rhombohedral perovskite phase for the samples sintered at 600 °C. The examination of microstructure showed uniform hexagonal shaped grains. From magnetisation measurement, it was observed that an increase in sintering temperature from 600 to 700 °C decreased the remanent magnetization from 0.025 to 0.003 emu/g suggesting a weak ferromagnetic nature at room temperature. Moreover, better microwave absorption properties with minimum reflection loss were also observed. Impedance measurements were performed by vector network analyser in frequency range 8.2–12.4 GHz for the sample annealed at 700 °C. From the dielectric permittivity (ε = ε′ − jε″) and magnetic permeability (µ = µ′ − jµ″) measurements, it was found that the observed dielectric and magnetic losses were higher in the case of BFO sintered at 700 °C.

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Acknowledgments

We would like to express our gratitude to Defence Research and Development Organization (DRDO), India, for the financial support to carry out this work. We express our sincere thanks to the Director, DMRL and Director, Defence Laboratories Jodhpur for their encouragement and support.

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Authors and Affiliations

  1. Defence Metallurgical Research Laboratory, Advanced Magnetics Group, Hyderabad, 500 058, India

    N. Shara Sowmya, A. Srinivas & S. V. Kamat

  2. School of Physics, University of Hyderabad, Gachibowli, Hyderabad, 500 046, India

    Pittala Suresh

  3. Defence Laboratories, Ratananda Palace, Jodhpur, 342011, India

    Anuj Shukla

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  1. N. Shara Sowmya
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  2. A. Srinivas
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  5. S. V. Kamat
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Correspondence to A. Srinivas.

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Sowmya, N.S., Srinivas, A., Suresh, P. et al. Synthesis and study of structural, magnetic and microwave absorption properties in multiferroic BiFeO3 electroceramic. J Mater Sci: Mater Electron 26, 5368–5372 (2015). https://doi.org/10.1007/s10854-015-3081-5

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