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Title: Synthesis and Characterization of Zirconium Substituted Cobalt Ferrite Nanopowders

Nanocrystalline ferrites; CoFe2O4 (CFO) and CoFe1.9Zr0.1O4 (CFZO) have been synthesized through chemical coprecipitation method. Moreover, the role played by the zirconium ions in improving the magnetic and structural properties is analyzed. X-ray diffraction revealed a single-phase cubic spinel structure for both materials, where the crystallite size increases and the lattice parameter decreases with substitution of Zr. The average sizes of the nanoparticles are estimated to be 16-19 nm. These sizes are small enough to achieve the suitable signal to noise ratio in the high density recording media. An increase in the saturation magnetization with the substitution of Zr suggests the preferential occupation of Zr4+ ions in the tetrahedral sites. A decrease in the coercivity values indicates the reduction of magneto-crystalline anisotropy. We investigated spinel ferrites can be used also in recoding media due to the large value of coercivity 1000 Oe which is comparable to those of hard magnetic materials.
Authors:
 [1] ;  [1] ;  [2]
  1. National Inst. for Research and Development in Electrochemistry and Condensed Matter (Romania)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
Publication Date:
OSTI Identifier:
1324165
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Journal of Nanoscience and Nanotechnology
Additional Journal Information:
Journal Volume: 16; Journal Issue: 1; Journal ID: ISSN 1533-4880
Publisher:
American Scientific Publishers
Research Org:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE Nanostructures; Chemical Synthesis; X-ray Diffraction; Magnetic Properties; MAGNETIC-PROPERTIES; COFE2O4 NANOPARTICLES; BIOMEDICAL APPLICATIONS; COPRECIPITATION METHOD; COLOSSAL REDUCTION; CURIE-TEMPERATURE; FE NANOPARTICLES; POWDERS