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      https://www.ias.ac.in/article/fulltext/boms/015/02/0161-0170

    • Keywords

       

      Mössbauer; X-ray diffraction; positron; magnetite; hematite ore

    • Abstract

       

      Natural magnetite and hematite samples taken from iron ore deposits associated with Precambrian banded iron-formation (BIF) at Ari Dongri (20°23′N:81°3°E), Bastar district in Central India have been studied by Mossbauer, XRD and positron annihilation techniques. Three magnetite samples show a genetic association with α-Fe2O3 with a wide range of variations in Fe3O4:α-Fe2O3 ratio. The fourth sample, a typical specular hematite, shows α-Fe2O3 content of the order of 90%, the rest being magnetite. The magnetite present in the samples was found to be stoichiometric. None of the samples contains maghemite (γ-Fe2O3). Some geological implications of the observed variation in the oxidation states of the samples are considered.

    • Author Affiliations

       

      D Das1 M B Chakraborti2 K Choudhury1 P M G Nambissan3 B R S Babu3 4 P Sen3 Sangeeta5 C K Majumdar6

      1. Department of Solid State Physics, Indian Association for the Cultivation of Science, Jadavpur, Calcutta - 700032, India
      2. Geology Department, Presidency College, Calcutta - 700073, India
      3. Cyclic Accelerator Division, Saha Institute of Nuclear Physics, Calcutta - 700009, India
      4. On leave of absence from Department of Physics, Calicut University, Calicut - 673 635, India
      5. Technical Physics and Prototype Engineering Division, Bhabha Atomic Research Centre, Trombay, Bombay - 400085, India
      6. S N Bose National Centre for Basic Sciences, Calcutta - 700 064, India
    • Dates

       
  • Bulletin of Materials Science | News

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