Abstract
Pr2Fe17H5 is an interesting compound where isolated hexagons formed by the tetrahedral sites of the host metal lattice are filled with hydrogen atoms. A localized jump diffusion of hydrogen atoms in Pr2Fe17H5 over the vertices of the hexagons is observed using quasielastic neutron scattering. The hydrogen hopping occurs despite the repulsive interaction due to the presence of two hydrogen atoms per hexagon. The residence time of hydrogen atoms between jumps follows an Arrhenius-type law with an activation energy of 0.14 eV. The hydrogen atoms in the octahedral sites are found to be immobile on the time scale of the measurement.
| Original language | English |
|---|---|
| Article number | 214305 |
| Pages (from-to) | 1-5 |
| Number of pages | 5 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 70 |
| Issue number | 21 |
| DOIs | |
| State | Published - Dec 2004 |
| Externally published | Yes |
Funding
The authors are grateful to I. Peral for assistance with the measurements and to R. Cappelletti for valuable discussions. O.I. would like to thank G. J. Long and F. Grandjean for interesting discussions. Utilization of the DAVE package for the data analysis is acknowledged. This work utilized facilities supported in part by the National Science Foundation under Agreement No. DMR-0086210.
| Funders | Funder number |
|---|---|
| National Science Foundation | DMR-0086210 |