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      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/034/07/1415-1419

    • Keywords

       

      Sol–gel preparation; ferrites; crystallite size; coercivity.

    • Abstract

       

      Co0.5Mn0.5Fe2O4 ferrites have been synthesized using a single-step sol–gel auto-combustion method in which the metal nitrate (MN)-to-citric acid (CA) ratio was adjusted to 0.5 : 1 and pH to 7, respectively. The structural and magnetic properties of as-burnt and annealed samples were studied as a function of temperature. The inverse spinel structure was confirmed by X-ray diffraction (XRD) and crystallite size was estimated by the most intense peak (311) using Scherrer’s formula. Contrary to earlier studies reported in the literature, both as-burnt and annealed samples exhibit crystalline behaviour. Room temperature magnetic properties were studied using vibrating sample magnetometer (VSM) with field strengths up to ± 10 kOe. Lattice constant and crystallite size increased as the annealing temperature was increased. However, the coercivity (𝐻c) initially increased and then decreased with the increase of crystallite size. The variation in coercivity is ascribed to the transition from a multi-domain to a single-domain configuration.

    • Author Affiliations

       

      S M Ramay1 Murtaza Saleem2 S Atiq2 Saadat A Siddiqi3 S Naseem2 M Sabieh Anwar1

      1. School of Science and Engineering, Lahore University of Management Sciences (LUMS), Opposite Sector U, DHA, Lahore 54792, Pakistan
      2. Centre of Excellence in Solid State Physics, University of the Punjab, Lahore 54590, Pakistan
      3. Interdisciplinary Research Centre in Biomedical Materials, COMSATS IIT, Off Raiwind Road, Lahore, Pakistan
    • Dates

       
  • Bulletin of Materials Science | News

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