Effect of Mg Substitution on the Structural, Magnetic and Hyperfine Properties of ZnFe2O4 Nanopowders Synthesized by Spray Pyrolysis Method

Authors

  • Subin P. John  Mossbauer Research group, St. Berchmans Autonomous College, Kerala, India
  • Jacob Mathew  Mossbauer Research group, St. Berchmans Autonomous College, Kerala, India

Keywords:

Mg-Zn nanoferrites, Cation migration, A-B super exchange interaction, Superparamagnetism, Coexistence of magnetic phases, Mossbauer spectroscopy

Abstract

MgxZn1-xFe2O4 nanoparticles were synthesized by spray pyrolysis method using polymer precursor and characterized their structural, magnetic and hyperfine properties as a function of magnesium concentration. X-ray diffraction revealed cubic spinel structure of the prepared samples and structural refinement was done by Rietveld method. Cation distribution obtained from the Rietveld method reflected migration of cations among the interstitial sites. Fourier transform infrared spectroscopy confirmed the formation of spinel structure of the nanoparticles and shift of band center with magnesium doping due to cation migration was observed. Saturation magnetization increased with magnesium concentration due to enhancement in A-B superexchange interaction and coercivity varied in accordance with Brown’s relation. The curve fitting of the magnetization data revealed coexistence of superparamgnetic, paramagnetic and ferromagnetic phases in the prepared nanoparticles. Mossbauer spectroscopy, a technique with different operating time scale than that of vibration sample magnetometer, indicated incomplete magnetic ordering and strongly confirmed the enhancement of A-B interaction with magnesium concentration. The Mossbauer studies further confirmed the coexistence of different magnetic phases in the sample.

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International Journal of Scientific Research in Science and Technology

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Published

2017-12-15

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Volume 3, Issue 11, November-December-2017

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Research Articles

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[1]
Subin P. John, Jacob Mathew, " Effect of Mg Substitution on the Structural, Magnetic and Hyperfine Properties of ZnFe2O4 Nanopowders Synthesized by Spray Pyrolysis Method, International Journal of Scientific Research in Science and Technology(IJSRST), Online ISSN : 2395-602X, Print ISSN : 2395-6011, Volume 3, Issue 11, pp.220-230, November-December-2017.