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Article
Comparative Mössbauer Effect Study of Several R2Fe17 and R2Fe17Nx Compounds
Journal of Applied Physics
  • Gary J. Long, Missouri University of Science and Technology
  • Sanjay R. Mishra
  • Oran Allan Pringle, Missouri University of Science and Technology
  • Fernande Grandjean, Missouri University of Science and Technology
  • K. H. Buschow
Abstract

The Mössbauer spectra of Sm2Fe17 and Ho 2Fe17 and their nitrides have been measured between 295 and 85 K and analyzed with a model which is consistent with our earlier work on R2Fe17 and R2Fe17Nx compounds, where R is Pr, Nd, and Th. This model is completely consistent throughout these rare-earth compounds and is in agreement with the crystallographic changes occurring upon nitrogenation and with the prediction of band structure calculations. The dramatic increase in Curie temperature in the nitrides results from the expansion of the crystallographic lattice, an expansion which is mainly centered on the 9d and 18h iron sites as is indicated by the increase of their Wigner-Seitz cell volumes upon nitrogenation. The 9d and 18h sites show a larger enhancement of their hyperfine fields as compared to the 6c and 18f sites as a result of improved ferromagnetic exchange between these sites and their near neighbors because of the lattice expansion and the consequent reduced iron 3d-iron 3d overlap.

Department(s)
Chemistry
Second Department
Physics
Document Type
Article - Journal
Document Version
Final Version
File Type
text
Language(s)
English
Rights
© 1994 American Institute of Physics (AIP), All rights reserved.
Publication Date
5-1-1994
Disciplines
Citation Information
Gary J. Long, Sanjay R. Mishra, Oran Allan Pringle, Fernande Grandjean, et al.. "Comparative Mössbauer Effect Study of Several R2Fe17 and R2Fe17Nx Compounds" Journal of Applied Physics Vol. 75 Iss. 10 (1994) p. 5994 - 5996 ISSN: 0021-8979
Available at: http://works.bepress.com/gary-long/137/