Landolt-Börnstein - Group III Condensed Matter

7.2.5.2.5 Hyperfine parameters determined by nuclear magnetic resonance

Abstract

This chapter discusses hyperfine parameters determined by nuclear magnetic resonance (NMR). The 57Fe NMR spin-echo spectra in Lu2Fe17N2.5, Lu2Fe17C0.6 and Lu2Fe17H2.3 compounds are very similar and a shift to higher frequencies with respect to that of Lu2Fe17 is observed. The mean hyperfine field values at 57Fe and the relative changes in the hyperfine field and volume due to C, N and H uptake in Lu2Fe17Ax (A = C, N, H) compounds at 4.2 K are tabulated. The data may be analysed in terms of magnetovolume effects and the relative contributions of the core and the conduction electrons to the hyperfine fields. The 89Y spin-echo NMR spectra in some Y2Fe17Cx, Y2Fe17Nx and Y2Fe17CNx interstitial compounds show well resolved satellite patterns. These are caused by different number of A = C, N atoms. Interstitial solution of C and N leads to substantial reduction in the Y hyperfine field. Frequencies corresponding to the centres of gravity of the NMR lines of 89Y in Y2Fe17Ax compounds at 4.2 K, effective fields Bhyp and relative line intensities are listed. 147Sm and 149Sm spin-echo NMR spectra of Sm2Fe17 and Sm2Fe17N2.5 at 4.2 K are given. The 147Sm and 149Sm central line positions ν in Sm2Fe17Nx at 4.2 K, the values of the hyperfine field Bhyp, quadrupole splitting ΔQ,and the corresponding EFG components along the Bhyp direction, V xx are also listed.

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Title
7.2.5.2.5 Hyperfine parameters determined by nuclear magnetic resonance
Book Title
Magnetic Alloys for Technical Applications. Hard Magnetic Alloys
In
7.2.5.2 R{2}Fe{17}A{x} compounds with A = C, N, B or D (H)
Book DOI
10.1007/b41058
Chapter DOI
10.1007/10028076_63
Part of
Landolt-Börnstein - Group III Condensed Matter
Volume
19I2
Editors
  • H. P. J. Wijn
  • Authors
  • E. Burzo
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