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Journal of Superconductivity and Novel Magnetism

, Volume 31, Issue 10, pp 3255–3262 | Cite as

Synthesis and Characterisation of Superparamagnetic MgFe2O4 Nanoferrite

  • C. Murugesan
  • J. Aroutchelvane
  • L. Okrasa
  • G. Chandrasekaran
Original Paper
  • 154 Downloads

Abstract

Nanocrystalline MgFe2O4 with crystallite size of 10.4 nm was synthesised using combustion method and characterised for structural, electrical, and magnetic properties. The powder X-ray diffraction analysis reveals the single-phase nature of MgFe2O4. The field emission scanning electron microscopy image shows the nanosized grains. The magnetic study reveals the superparamagnetic behaviour of MgFe2O4 with saturation magnetisation value of 14.57 emu/g. The blocking temperature is determined using low-temperature magnetic measurement which is equal to 139 K. Electrical study shows that the value of AC conductivity at 1 Hz is 1.12 × 10− 8 S/cm at 303 K and increases with frequency as well as temperature. The complex impedance analysis shows the grain and grain boundary resistance equal to 6.23 × 106 Ω and 1.27 × 107 Ω, respectively. The complex electric modulus analysis confirms the presence of two relaxation processes in nanocrystalline MgFe2O4.

Keywords

Spinel Crystallite size Superparamagnetism AC conductivity Impedance Electric modulus 

Notes

Acknowledgements

The authors thank Dr. Awadhesh Mani and Dr. K. Vinod, Low Temperature Studies Section, IGCAR, Kalpakkam, India for RT and low temperature magnetic measurement.

Funding Information

C.M thanks UGC, New Delhi, India for the financial assistance in the form of RGNF.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • C. Murugesan
    • 1
  • J. Aroutchelvane
    • 2
  • L. Okrasa
    • 3
  • G. Chandrasekaran
    • 1
  1. 1.Department of Physics, School of Physical, Chemical and Applied SciencesPondicherry UniversityPuducherryIndia
  2. 2.Defence Metallurgical Research LaboratoryHyderabadIndia
  3. 3.Department of Molecular PhysicsLodz University of TechnologyLodzPoland

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