Perturbed-angular-correlation study of static and dynamic quadrupole interactions in the Laves-phase hydridesHfV2H

Perturbed angular correlation study of static and dynamic hyperfine interactions at181Tain the Laves-phase hydridesErFe2Eek1, Forker2 2002Phys. Rev. BSelf Cite3010View full textAdd to dashboardCite

“…The comparison with the experimental value q f ϳ200 MHz leads to an effective charge of ZЈeϳ0.095e, similar to the H charge estimated for other metal-hydrogen systems. 32,33 The activation energy for H jumps in ErFe 2 H x for x ϭ1.5 and 2.0, obtained by a fit of the Arrhenius relation k ϰe (E a /kT) to the data in Fig. 5, is E a ϭ0.39(3) eV, in good agreement with the result of Atsumi et al 19 for the diffusion of H on R 2 Fe 2 interstitials in DyFe 2 H x .…”

Study of the EFG Trends in Zr2T (T = Fe, Co, Ni) Intermetallic Compounds

“…The calculated tj value for Zr in Zr 2 Co is much smaller than the experimental one, and there may be a special influence of the probe in this case. Finally, we have seen that there is no particular correlation between the density of states at the Fermi level and the EFG value as it has been recently suggested for HfV 2 H x compounds [18]. We note that the EFG originates from small differences in occupations of orbitals of different symmetry around the nucleus, and these differences usually develop along the whole occupied bands.…”

PAC Probes as Diffusion Tracers in Solids

“…These measurements differ from previous studies of nuclear quadrupole relaxation using PAC probes, in which probes were generally at fixed locations with defects hopping in the local vicinity such as lattice vacancies (see, e.g., [3Y5]), hydrogen atoms (see, e.g., [6,7]) or electronic defects (see, e.g., [8]). Those studies were mostly made using probe atoms at sites having cubic point symmetry, so that the electric field gradient (EFG) could be attributed entirely to the neighboring defect.…”