NMR second-moment study of hydrogen sites in icosahedral Ti45Zr38Ni17 quasicrystals

Citation
Kr. Faust et al., NMR second-moment study of hydrogen sites in icosahedral Ti45Zr38Ni17 quasicrystals, PHYS REV B, 62(17), 2000, pp. 11444-11449
Citations number
31
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICAL REVIEW B
ISSN journal
01631829 → ACNP
Volume
62
Issue
17
Year of publication
2000
Pages
11444 - 11449
Database
ISI
SICI code
0163-1829(20001101)62:17<11444:NSSOHS>2.0.ZU;2-V
Abstract
Quasicrystalline Ti45Zr38Ni17Hx samples were prepared with hydrogen-to-meta l ratios (H/M) ranging from 0.25 to 1.85. The higher-concentration samples lost hydrogen, falling to H/M approximate to 1.6 over the course of days to weeks. The calibration of x-ray peak shifts as a measure of H/M, previousl y based on an extrapolation for H/M > 1.6, has been confirmed. Nuclear magn etic resonance measurements of the second moments (M-2) of the dipole-broad ened H-1 line show the dependence on H/M expected for uniform filling of th e quasicrystal with hydrogen. M-2 data were also consistent with canonical cell-tiling models of the host structure when hydrogen was sited preferenti ally near Ti or Zr neighbors. The quasicrystalline structure allows the che mical preference in hydrogen siting to be compatible with spatially uniform filling of the quasicrystal.