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      Permanent link:
      https://www.ias.ac.in/article/fulltext/jcsc/120/06/0521-0528

    • Keywords

       

      Reverse micelles; Morin transition; metal carboxylates; Verwey transition.

    • Abstract

       

      Sub-micron rods and spheres of cobalt succinate sesquihydrate and iron succinate trihydrate/pentahydrate respectively have been synthesized by the reverse micellar route. These precursors are an excellent source for the synthesis of metal and metal oxide nanoparticles. Cubes of (edge length ∼ 150 nm) Fe3O4 and elongated particles of Fe2O3 (∼ diameter of 200 nm) were obtained. The role of oxidation state of the metal ion in controlling the morphology of the nanostructured dicarboxylates has been investigated. Rods with shorter length were obtained when longer chain dicarboxylate was used as ligand. Heating in nitrogen atmosphere also provided pure Co and 𝛼-Fe nanoparticles. The Fe nanoparticles show nearly 100% superparamagnetism. Temperature-dependent magnetic studies show a Morin-like transition for Fe2O3 nanoparticles at 223 K and the Verwey transition at 115 K for Fe3O4 nanoparticles. Co3O4 nanoparticles showed antiferromagnetic ordering at 20 K.

    • Author Affiliations

       

      Aparna Ganguly1 Rituparna Kundu2 Kandalam V Ramanujachary3 Samuel E Lofland4 Dipankar Dase5 N Y Vasanthacharya6 Tokeer Ahmad1 Ashok K Ganguli2

      1. Department of Chemistry, Faculty of Natural Sciences, Jamia Millia Islamia, New Delhi 110 025
      2. Department of Chemistry, Indian Institute of Technology, Hauz Khas, New Delhi 110 016
      3. Department of Chemistry and Biochemistry, Center for Materials Research and Education, Rowan University, 201 Mullica Hill Road, Glassboro, NJ 08028, USA
      4. Department of Physics, Center for Materials Research and Education, Rowan University, 201 Mullica Hill Road, Glassboro, NJ 08028, USA
      5. UGC-DAE, Consortium for Scientific Research, LB-8, Sector-III, Bidhannagar, Kolkata 700 098
      6. Solid State and Structural Chemistry Unit, Indian Institute of Sciences, Bangalore 560 012

    • Dates

       
      Published
      November 2008

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