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Hyperfine Interactions

, Volume 184, Issue 1–3, pp 227–233 | Cite as

Magnetic and Mössbauer studies on nanocrystalline Co1−x Li x Fe2O4 (x = 0, 0.2)

  • R. S. Ningthoujam
  • S. S. Umare
  • S. J. Sharma
  • R. Shukla
  • Sajith Kurian
  • R. K. Vatsa
  • A. K. Tyagi
  • R. Tewari
  • G. K. Dey
  • N. S. Gajbhiye
Article

Abstract

Ultrafine particles of Co1 − x Li x Fe2O4 (x = 0, 0.2) samples are prepared by glycine–nitrate combustion route. X-ray diffraction and transmission electron microscopy studies show that the samples have cubic spinel structure and average crystallite sizes of x = 0 and 0.2 are 36 and 44 nm respectively. Vibrating sample magnetometer studies revealed the ferromagnetic nature of the samples. Li-doped CoFe2O4 sample showed higher values of coercive field, remanent magnetization and saturation magnetization compared to pure CoF2O4 indicating the enhancement of magnetic interactions. Mössbauer spectra at 77 K exhibited two broad sextets indicating that Fe3 +  ions occupy both tetrahedral and octahedral sites. From these studies, it is concluded that Co1 − x Li x Fe2O4 (x = 0, 0.2) samples exhibit an inverse spinel structure. At room temperature, two sextets are superimposed on a very broad non-Lorentzian background indicating the presence of superparamgnetic fraction in agreement with the microscopic observations.

Keywords

Mössbauer studies Ferrites CoFe2O4 sample 

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Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  • R. S. Ningthoujam
    • 1
  • S. S. Umare
    • 2
  • S. J. Sharma
    • 3
  • R. Shukla
    • 1
  • Sajith Kurian
    • 4
  • R. K. Vatsa
    • 1
  • A. K. Tyagi
    • 1
  • R. Tewari
    • 5
  • G. K. Dey
    • 5
  • N. S. Gajbhiye
    • 4
  1. 1.Chemistry DivisionBhabha Atomic Research CentreMumbaiIndia
  2. 2.Department of ChemistryVisvesvaraya National Institute of TechnologyNagpurIndia
  3. 3.Department of ElectronicsS. K. Porwal CollegeKampteeIndia
  4. 4.Department of ChemistryIndian Institute of Technology KanpurKanpurIndia
  5. 5.Material Science DivisionBhabha Atomic Research CentreMumbaiIndia

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