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

Afaq H. Piracha, Shahid M. Ramay, Shahid Atiq, Saadat A. Siddiqi, Murtaza Saleem*, Muhammad Sabieh Anwar

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


High temperature frequency dependent dielectric properties, and room temperature magnetic behavior of mixed ferrites with controlled content of Mg in Co 1−xMg xFe 2O4(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.

Original languageEnglish
Pages (from-to)122-129
Number of pages8
JournalJournal of Electroceramics
Issue number2-3
Publication statusPublished - 13 May 2015
Externally publishedYes


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


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