A Mössbauer effect study of Y2Fe14B and its aluminum solid solutions

Abstract

The Mössbauer spectra of Y2Fe14B have been measured from 85 to 296 K. Analysis of the spectra indicates that the near-neighbor rare-earth atoms directly influence the orientation of the principal axis of the electric field gradient. The hyperfine parameters are very similar to those of Nd2Fe14B, but the internal fields are somewhat smaller at room temperature in the yttrium compound. The Mösssbauer spectra of Y2(Fe1−xAlx)14B, where x equals 0.00, 0.02, 0.04, 0.06, and 0.08, have been measured at 85 K. The average internal hyperfine field in these compounds decreases linearly with increasing aluminum content.

Fe57Mössbauer and x-ray magnetic circular dichroism study of magnetic compensation of the rare-earth sublattice inNd2−Chaboy1, Piquer2, Plugaru3 et al. 2007Phys. Rev. B170100View full textAdd to dashboardCite

“…4, have been fitted with six sextets corresponding to the six crystallographic nonequivalent Fe sites of the R 2 Fe 14 B structure. [30][31][32][33] In all cases a small amount of magnetic ␣-Fe has been included in the fit. Because its amount ͑Ͻ3%͒ is known from the previous x-ray diffraction ͑XRD͒ analysis and the hyperfine parameters are known from the literature, 34 they have been included in the fit with no modification of the number of adjustable parameters.…”

“…On the basis of the near neighbor environment ͑Z Fe and Z B ͒ one would expect B hf ͑16k 1 ͒ Ͼ B hf ͑8j 1 ͒ Ͼ B hf ͑4e͒ but, in practice, it is found that the values of B hf ͑16k 1 ͒, B hf ͑8j 1 ͒, and B hf ͑4e͒ are very similar. [30][31][32][33] Moreover, their hierarchy is different depending on both the particular compound and the fitting procedure. [30][31][32][33] These small discrepancies may be due to the influence of the different Wigner-Seitz volumes ͑the 16k 1 has the smallest V WS ͒, and also to the influence of the rare earth ͑the 8j 1 site has four R-atom near neighbors while the 16k 1 and the 4e sites have only two R near neighbors͒.…”