• A Mössbauer study of hyperfine interaction in the systems CoxMn3−xyFeyO4 and NixMn3−xyFeyO4

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    • Keywords

       

      Hyperfine interaction; octahedral hyperfine field; tetrahedral hyperfine field; quadrupole splitting; isomer shift; octahedral site preference energy; super exchange interaction

    • Abstract

       

      A Mössbauer study of systems CoxMn3−xyFeyO4 and NixMn3−xyFeyO4 for values ofx=0·1, 0·5, 1·0 andy ranging from 0·1 to 2·0 in steps of 0·2 have been made. At room temperature samples fory values ranging in between 0·1 to 0·5 exhibit paramagnetic behaviour while all spectra for values ofy between 0·6 to 0·8 show relaxation effects. Well-defined hyperfine Zeeman spectra are observed for all the samples withy>0·8 and resolved in two sextets corresponding to octahedral and tetrahedral site symmetries and a central doublet probably due to the presence of super-paramagnetic particles in the system. The hyperfine field at57Fe nucleus reduces with decreasing iron cobalt and nickel concentration. These observations have been explained in terms of site preference of cations and exchange interactions.

    • Author Affiliations

       

      V K Singh1 2 R Chandra1 S Lokanathan1

      1. Department of Physics, University of Rajasthan, Jaipur - 302 004, India
      2. Department of Physics, SGRR (PG) College, Dehra Dun - 248 001, India
    • Dates

       
  • Pramana – Journal of Physics | News

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