Hyperfine Interactions

, Volume 95, Issue 1, pp 277–289 | Cite as

A Mössbauer effect study of the interstitial hydrides and nitride of Nd2Fe17

  • F. Grandjean
  • Gary J. Long
  • S. Mishra
  • O. A. Pringle
  • O. Isnard
  • S. Miraglia
  • D. Fruchart
Invited Contributions

Abstract

The Mössbauer effect spectra of Nd2Fe17H3, Nd2Fe17H5, and Nd2Fe17N3 have been measured at several temperatures between 85 and 295 K and fitted with a model which is similar to that used for the analysis of the Mössbauer effect spectra of Nd2Fe17 and Nd2Fe17N2.6. The weighted average isomer shift increases in going from Nd2Fe17 to its hydrides and nitride, an increase which results mainly from the lattice expansion. The changes in the individual isomer shifts upon hydrogenation may be understood in terms of the expansion of the Wigner-Seitz cell volume and the presence of hydrogen or nitrogen near neighbors at a specific site. The 295 K weighted average hyperfine field increases from 157 kOe in Nd2Fe17 to 243 kOe in Nd2Fe17H3, 280 kOe in Nd2Fe17H5, and 318 kOe in Nd2Fe17N3, a sequence determined by the Curie temperatures. In contrast, the weighted average hyperfine field at 85 K and the saturation magnetization at 5 K for Nd2Fe17H3 are lower than those of Nd2Fe17, presumably because of thec-axis lattice contraction which occurs upon hydrogenation of this compound. The main difference between the effect of hydrogenation and nitrogenation resides in the substantial increase observed for the 9d and 18h hyperfine fields upon nitrogenation.

Keywords

Nitride Hydride Cell Volume Curie Temperature Saturation Magnetization 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. [1]
    J.M.D. Coey and H. Sun, J. Magn. Magn. Mater. 87 (1990) L251.CrossRefGoogle Scholar
  2. [2]
    J.F. Herbst, J.J. Croat, R.W. Lee and W.B. Yelon, J. Appl. Phys. 53 (1982) 250.CrossRefGoogle Scholar
  3. [3]
    B. Rupp and G. Wiesinger, J. Magn. Magn. Mater. 71 (1988) 269.CrossRefGoogle Scholar
  4. [4]
    J.M.D. Coey and H. Sun, in:Proc. 11th Int. Workshop on Rare-Earth Magnets and their Applications, Vol. 2, ed. S.G. Sankar, Carnegie-Mellon University, Pittsburgh, 1990, p. 36.Google Scholar
  5. [5]
    O. Isnard, S. Miraglia, J.L. Soubeyroux and D. Fruchart, J. Alloys Comp. 190 (1992) 129.Google Scholar
  6. [6]
    G.J. Long, O.A. Pringle, F. Grandjean and K.H.J. Buschow, J. Appl. Phys. 72 (1992) 4845.CrossRefGoogle Scholar
  7. [7]
    G.J. Long, O.A. Pringle, F. Grandjean, W.B. Yelon and K.H.J. Buschow, J. Appl. Phys. 74 (1993) 504.CrossRefGoogle Scholar
  8. [8]
    G.J. Long, S. Mishra, O.A. Pringle, F. Grandjean and K.H.J. Buschow, J. Appl. Phys. 75 (1994) 5994.CrossRefGoogle Scholar
  9. [9]
    G.J. Long, O.A. Pringle, F. Grandjean, T.H. Jacobs and K.H.J. Buschow, J. Appl. Phys. 75 (1994) 2598.CrossRefGoogle Scholar
  10. [10]
    O. Isnard, S. Miraglia, J.L. Soubeyroux and D. Fruchart, Solid State Commun. 81 (1992) 13;CrossRefGoogle Scholar
  11. [10]a
    O. Isnard, S. Miraglia, M. Guillot and D. Fruchart, J. Appl. Phys. 75 (1994) 5988.CrossRefGoogle Scholar
  12. [11]
    R.M. Ibberson, O. Moze, T.H. Jacobs and K.H.J. Buschow, J. Phys.: Condens. Matter 3 (1991) 1219.CrossRefGoogle Scholar
  13. [12]
    R.H. Herber, in:Chemical Mössbauer Spectroscopy, ed. R.H. Herber (Plenum Press, New York, 1984) p. 199.Google Scholar
  14. [13]
    S.S. Jaswal, IEEE Trans. Magn. 28 (1992) 2322.CrossRefGoogle Scholar
  15. [14]
    Q. Qi, H. Sun, R. Skomski and J.M.D. Coey, Phys. Rev. B 45 (1992) 12278.Google Scholar
  16. [15]
    O. Isnard, unpublished.Google Scholar
  17. [16]
    Z. Gu and W. Lai, J. Appl. Phys. 71 (1992) 3911.CrossRefGoogle Scholar
  18. [17]
    R. Coehoorn and G.H.O. Daalderop, J. Magn. Magn. Mater. 104–107 (1992) 1081.CrossRefGoogle Scholar

Copyright information

© J.C. Baltzer AG, Science Publishers 1995

Authors and Affiliations

  • F. Grandjean
    • 1
  • Gary J. Long
    • 2
  • S. Mishra
    • 3
  • O. A. Pringle
    • 3
  • O. Isnard
    • 4
    • 5
  • S. Miraglia
    • 5
  • D. Fruchart
    • 5
  1. 1.Institut de Physique, B5Université de LiègeSart-TilmanBelgium
  2. 2.Department of ChemistryUniversity of Missouri-RollaRollaUSA
  3. 3.Department of PhysicsUniversity of Missouri-RollaRollaUSA
  4. 4.Institut Laue LangevinAssocié à l'Université J. FourierGrenoble Cedex 09France
  5. 5.The Laboratoire de Cristallographie du CNRSAssocié à l'Université J. FourierGrenoble Cedex 09France

Personalised recommendations