• A Mössbauer study of octahedral site symmetries in systems Cox Mn3−xy FeyO4 and NixMn3−xyFeyO4

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      https://www.ias.ac.in/article/fulltext/pram/020/01/0001-0005

    • Keywords

       

      Octahedral sites; tetrahedral sites; quadrupole doublet; site preference energy; oxygen deviation parameter

    • Abstract

       

      A Mössbauer study of cation distribution in systems Cox Mn3−xyFeyO4 and Nix Mn3−xy FeyO4 has been made. It has been found that in both systems all specimens withy<0.6 value exhibit quadrupole doublets corresponding to site symmetries Fe3+(I) and Fe3+(II) of octahedral site. As more and more cobalt or nickel is introduced into the matrix the intensity of the inner quadrupole doublet increases while on introducing iron that of the outer quadrupole doublet increases. After a certain concentration of iron the inner doublet starts becoming more intense. It is suggested that this arises possibly from the substitution of cations in the second co-ordination sphere of Fe3+(I) and Fe3+(II) sites. Fory>0.6 the Mössbauer spectra show relaxation effects.

    • Author Affiliations

       

      V K Singh1 2 S Lokanathan1

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

       
  • Pramana – Journal of Physics | News

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