Abstract
The 147Sm and 149Sm NMR spin echo spectra and the spin echo decays of Sm 2Fe 17C x for x = 0, 0.5, 1 and about 3 at 4.2 K are reported. The quadrupole septets in the spectra are assigned to the samarium 6c site with different numbers of carbon atoms occupying the neighbouring 9e interstitial sites. A significant influence of carbon neighbours on the Sm quadrupole splitting and hyperfine field is observed and is attributed to a strong change of the Sm valence electron distribution and polarisation caused by carbon neighbours. From the quadrupole splittings the values of the lattice electric field gradient and the corresponding crystal electric field coefficient A 2 0 are derived. For the Sm sites with 0 (3) carbon nearest neighbours the A 2 0 value of −66 K a 0 −2 (−350 K a 0 −2 is obtained.
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