Steric variation of the cerium valence in Ce2Fe14B and related compounds

DOI PDF 被引用文献1件
  • T. W. Capehart
    Physics Department, General Motors North American Operations Research and Development Center, 30500 Mound Road, Warren, Michigan 48090-9055
  • R. K. Mishra
    Physics Department, General Motors North American Operations Research and Development Center, 30500 Mound Road, Warren, Michigan 48090-9055
  • G. P. Meisner
    Physics Department, General Motors North American Operations Research and Development Center, 30500 Mound Road, Warren, Michigan 48090-9055
  • C. D. Fuerst
    Physics Department, General Motors North American Operations Research and Development Center, 30500 Mound Road, Warren, Michigan 48090-9055
  • J. F. Herbst
    Physics Department, General Motors North American Operations Research and Development Center, 30500 Mound Road, Warren, Michigan 48090-9055

書誌事項

公開日
1993-12-27
DOI
  • 10.1063/1.110075
公開者
AIP Publishing

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説明

<jats:p>Through measurements of the near-edge Ce L3 x-ray absorption structure we have investigated the influence of site volume on the cerium valence in Ce2Fe14B, Ce2Fe14BHx, and Ce2Fe17. The crystal structures of these compounds are isomorphic with those of technologically important permanent magnet materials. Confirming other experiments, we find that the Ce ion in Ce2Fe14B is in a strongly mixed-valent α-like state which is incompatible with a local 4f moment. Comparison of the spectroscopically determined valences of the three materials demonstrates a shift toward a γ-like cerium state, which supports a magnetic moment, as the steric volume of the Ce site(s) increases. Our results strongly suggest that the volume of the rare-earth site is the principal factor controlling the Ce chemical valence in these systems.</jats:p>

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