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Dielectric and magnetic investigations of mixed cubic spinel Co-ferrites with controlled Mg content

Journal of Electroceramics volume 34, pages 122–129 (2015)Cite this article

Abstract

High temperature frequency dependent dielectric properties, and room temperature magnetic behavior of mixed ferrites with controlled content of Mg in Co 1−x Mg x Fe 2 O 4(x=0.0,0.1,0.3,0.5,0.7,0.9 and 1.0) compositions are studied. Single phase spinel structure with cubic symmetry, lattice parameters, crystallite size, magnetic and dielectric properties were substantiated with x-ray diffractometer, transmission electron microscope, vibrating sample magnetometer and impedance analysis, respectively. Due to interfacial polarization, dielectric behavior of all the compositions shows dispersion with increase in frequency. The dielectric data was investigated by comparing the tangent loss and electric modulus for assigning the type and mechanism of dielectric relaxation. Temperature dependent dielectric constant, tangent loss and AC conductivity increase due to thermal activation of charge carriers and drift mobility. Furthermore, room temperature weak ferromagnetic behavior is observed due to the incorporation of non-magnetic Mg ions.

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Acknowledgments

The authors would like to extend their sincere appreciation to the Deanship of Scientific Research at King Saud University for funding this Research group No. RG 1435-004.

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Authors and Affiliations

  1. School of Science and Engineering (SSE), Lahore University of Management Sciences (LUMS), Opposite Sector U, D.H.A., Lahore, 54792, Pakistan

    Afaq H. Piracha, Murtaza Saleem & Muhammad Sabieh Anwar

  2. Centre of Excellence in Solid State Physics, University of the Punjab, Quaid-e-Azam Campus, Lahore, 54590, Pakistan

    Shahid Atiq

  3. Interdisciplinary Research Centre in Biomedical Materials (IRCBM), COMSATS Institute of Information Technology, Defence Road, Off Raiwind Road, Lahore, Pakistan

    Saadat A. Siddiqi

  4. Physics and Astronomy Department, College of Science, King Saud University, P.O. Box 800, Riyadh, 11421, Saudi Arabia

    Shahid M. Ramay

Authors
  1. Afaq H. Piracha
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  2. Shahid M. Ramay
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  3. Shahid Atiq
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  4. Saadat A. Siddiqi
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  5. Murtaza Saleem
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  6. Muhammad Sabieh Anwar
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Correspondence to Murtaza Saleem.

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Piracha, A.H., Ramay, S.M., Atiq, S. et al. Dielectric and magnetic investigations of mixed cubic spinel Co-ferrites with controlled Mg content. J Electroceram 34, 122–129 (2015). https://doi.org/10.1007/s10832-014-9960-y

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  • DOI: https://doi.org/10.1007/s10832-014-9960-y

Keywords

  • Ferrites
  • sol-gel
  • Dielectric relaxation
  • Stretching parameter