ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
In order to study the location of hydrogen atoms and the effects of their insertion into R2Fe17, spin–echo NMR experiments have been carried out on the hexagonal Y2Fe17Hx (x=0, 3.0, 4.7), rhombohedral Sm2Fe17Hx (x=0, 1.7, 5.7), and mixed-phase Gd2Fe17Hx (x=0, 2.3, 5.8) compounds. 1H and 89Y spectra obtained from Y2Fe17Hx clearly demonstrate that the hydrogenation process is reversible upon vacuum annealing. For both Y2Fe17Hx and Sm2Fe17Hx, the 1H spectra show two broad peaks; the peaks are tentatively assigned to H atoms in the tetrahedral and octahedral interstitial sites, and a hydrogen filling scheme is proposed. For Gd2Fe17Hx, a single broad 1H peak near 70 MHz is observed; application of an external magnetic field indicates that the hyperfine field has the same direction as the net magnetization. © 1996 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.361842
