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CoFe2O4–BaTiO3 multiferroic composites: role of ferrite and ferroelectric phases on the structural, magneto dielectric properties

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Abstract

Cobalt ferrite (CoFe2O4) and Barium titanate (BaTiO3) nanoparticles have been prepared by the microwave hydrothermal technique at 150 °C/60 min. The synthesized powders have been characterized using transmission electron microscopy, X-ray diffraction (XRD) and fourier transformation infrared spectroscopy. The XRD analysis confirms the formation of desired phase with crystallite sizes 25 nm for CoFe2O4 and 20 nm for BaTiO3. The prepared powders were mixed at different weight proportions to obtain nanocomposites of (1 − x)CoFe2O4 + (x)BaTiO3 (0 ≤ x ≤ 1) and densified at 910 °C/50 min via the microwave sintering process. The presence of two phases (CoFe2O4 and BaTiO3) was confirmed using XRD and field emission scanning electron microscopy (FESEM). Ferroelectric (P–E) and magnetic (M–H) hysteresis loops have been studied at room temperature. In P–E loops, the coercive field and remanent polarization show light asymmetric behaviour with an increase of CoFe2O4phase concentration. The M–H loops infer that the magnetic saturation of the composite samples drops with increasing of BaTiO3 phase concentration. The frequency dependent permittivity and permeability properties have been measured over a wide frequency range (100 kHz–1.8 GHz). The static magneto-electric (ME) voltage coefficient (dE/dH)H is measured by vary in ME output voltage against the dc-bias magnetic field (H) at room temperature.

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Acknowledgements

The authors would like to thank U Basavaraju, CMTI Bangalore for his help during FESEM measurements.

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Authors and Affiliations

  1. Department of Physics, BVRIT Hyderabad College of Engineering for Women, Hyderabad, India

    T. Ramesh

  2. Department of Electronic Engineering, Yeungnam University, Gyeongsan, Republic of Korea

    V. Rajendar

  3. Department of Physics, Osmania University, Hyderabad, India

    S. R. Murthy

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Ramesh, T., Rajendar, V. & Murthy, S.R. CoFe2O4–BaTiO3 multiferroic composites: role of ferrite and ferroelectric phases on the structural, magneto dielectric properties. J Mater Sci: Mater Electron 28, 11779–11788 (2017). https://doi.org/10.1007/s10854-017-6983-6

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  • DOI: https://doi.org/10.1007/s10854-017-6983-6

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