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SSP 2004 pp 17-26 | Cite as

Magnetic Properties of Co and Ni Substituted ɛ-Fe3N Nanoparticles

  • N. S. Gajbhiye
  • R. S. Ningthoujam
  • Sayan Bhattacharyya
Conference paper

Abstract

In the present work, the nanostructured pseudo-binary ɛ-Fe3−x CoxN and ɛ-Fe3−x NixN (x = 0.0–0.8) systems (10–20 nm) are studied in detail for their intrinsic magnetic properties. These systems are indexed based on the hexagonal ɛ-Fe3N phase with the space group P63/mmc. However, for the cobalt containing samples, x = 0.4–0.8, a mixture of hexagonal ɛ-Fe3−x CoxN and bcc α-Fe phases are formed and for the nickel containing systems, x = 0.5–0.8, small amount of cubic γ′-Fe4−y NiyN is precipitated and these facts are supported by X-ray diffraction and 57Fe Mössbauer spectroscopy studies. Mössbauer studies also confirm the random occupation of the substituent elements and the superparamagnetic nature of these particles. The intrinsic magnetic properties (σ s, T c) are observed to vary with the Co and Ni contents. The low temperature magnetic properties are dominated by exchange bias phenomena and spin-glass like ordering, for these compositions.

Key words

nitrides nanocrystalline superparamagnetism spin-glass like nature 

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Copyright information

© Springer Science + Business Media B.V. 2006

Authors and Affiliations

  • N. S. Gajbhiye
    • 1
    • 2
  • R. S. Ningthoujam
    • 1
  • Sayan Bhattacharyya
    • 1
  1. 1.Department of ChemistryIndian Institute of TechnologyKanpurIndia
  2. 2.Institute of NanotechnologyForschungszentrum KarlsruheKarlsruheGermany

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