A comparison of the Mössbauer effect spectra of R2Fe14B and R2Fe14C

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

“…[30][31][32] In particular, we have observed that the largest absolute values of the quadrupole interaction are found for the 8j 2 and 4e sites, which is consistent with the very asymmetric electronic environment of these sites. 30 As shown in Table III all the hyperfine parameters ͑B hf , ␦, and eQV zz /2͒ slightly decrease when increasing the Ho content.…”

“…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.…”

Evolution of Nd2Fe14B nanoparticles magnetism during surfactant-assisted ball-milling

“…For the fitting procedure a typical 2:14:1 model was initially applied [19] while two sextets for the minor phases indicated by the Rietveld analysis (a-Fe, Fe 2 B) were also added. In the case of Fe 2 B, normally two sextets are needed, however the small percentage of the phase and the small difference in the hyperfine parameters of a-Fe and the two Fe 2 B sextets makes them indistinguishable in the specific spectra.…”

Magnetic properties and Mössbauer studies in Y1−x Gd x Fe2

“…These results are concurring with the increasing Curie temperature with Gd. Mössbauer studies on R 2 Fe 14 B compounds reveal that the average Fe hyperfine field increases as R varies from La to Gd and decreases for rare-earth heavier than Gd [10]. Further the substitution of Gd for Y increases the strength of Gd-Fe exchange interactions and also enhances the strength of the Fe-Fe interactions by increasing the Fe-Fe interatomic distance through lattice expansion [11].…”