Advertisement

Investigation of Eu3+ Site Occupancy and Eu-O Covalency in Nanocrystalline Y2O3 by Mössbauer Spectroscopy

  • G. Concas
  • F. Congiu
  • G. Spano
  • M. Bettinelli
  • A. Speghini
Conference paper

Abstract

A sample of nanocrystalline Y1.8Eu0.2O3 was examined by 151Eu Mössbauer spectroscopy. The degree of covalency of the Eu-0 bond has been studied. The spectrum of the cubic Y1.8Eu0.2O3 sample has been resolved into 2 contributions due to europium in the C3i and C2 sites, for the first time in 151Eu Mössbauer spectroscopy. The degree of covalency and the electric field gradient of the 2 sites has been compared. The occupancy, by the lanthanide ion, of the more and less symmetric sites in the cubic structure of Y1.8Eu0.2O3 has been investigated and discussed.

Keywords

Isomer Shift Electric Field Gradient Iron Foil Absorber Thickness Nanocrystalline Sample 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. [1]
    G. Blasse and B. C. Grabmaier, “Luminescent Materials”, Springer-Verlag, Berlin, 1994.CrossRefGoogle Scholar
  2. [2]
    G. Concas, C. Muntoni, G. Spano, M. Bettinelli and A. Speghini, Z. Naturforsch. 56a, 267 (2001).Google Scholar
  3. [3]
    G. Concas, F. Congiu, C. Muntoni, M. Bettinelli and A. Speghini, Phys. Rev. B 53, 6197 (1996).ADSGoogle Scholar
  4. [4]
    G. Fagherazzi, S. Polizzi, M. Bettinelli and A. Speghini, J. Mater. Res. 15, 586 (2000).ADSCrossRefGoogle Scholar
  5. [5]
    S. Polizzi, G. Fagherazzi, M. Battagliarin, M. Bettinelli and A. Speghini, J. Mater. Res., in press.Google Scholar
  6. [6]
    H. O’Connor and T. M. Valentine, Acta Crystallogr. 25, 2140 (1969).CrossRefGoogle Scholar
  7. [7]
    M. Bettinelli et al., unpublished results.Google Scholar
  8. [8]
    T. Ye, Z. Guiwen, Z. Weiping, and X. Shangda, Mater. Res. Bull. 32, 501 (1997).CrossRefGoogle Scholar
  9. [9]
    L. R. Morss, M. Siegal, L. Stenger and N. Edelstein, Inorg. Chem. 9, 1771 (1970).CrossRefGoogle Scholar
  10. [10]
    F. Grandjean and G. J. Long, in: “Mössbauer Spectroscopy Applied to Inorganic Chemistry”, Vol. 3, ed. G. J. Long and F. Grandjean, Plenum Press, New York, 1989, p. 513.Google Scholar

Copyright information

© Springer Science+Business Media Dordrecht 2002

Authors and Affiliations

  • G. Concas
    • 1
  • F. Congiu
    • 1
  • G. Spano
    • 1
  • M. Bettinelli
    • 2
  • A. Speghini
    • 2
  1. 1.Dipartimento di FisicaUniversità di Cagliari and Istituto Nazionale per la Fisica della MateriaMonserrato (CA)Italy
  2. 2.Dipartimento Scientifico e TecnologicoUniversità di VeronaVeronaItaly

Personalised recommendations