| Автор | R K Kremer |
| Автор | J K Cockcroft |
| Автор | H Mattausch |
| Автор | A Simon |
| Автор | G J Kearley |
| Дата выпуска | 1994-05-30 |
| dc.description | We report an investigation of the local modes of hydrogen and deuterium atoms by means of inelastic neutron scattering at 10 K and 100 K in some hydride and deuteride monohalides of the rare-earth elements, REXH<sub>x</sub>, with RE=Y and Tb, X=Cl and Br and x approximately=0.8. These compounds contain hydrogen/deuterium atoms in distorted tetrahedral metal-atom voids. The hydride spectra exhibit two modes centred at about 125 meV and 90 meV for YBrD<sub>x</sub>. For the deuterium compounds YBrD<sub>x</sub> (x approximately=0.8) second-harmonic transitions are observed. The energy splitting of the two modes is of the order of 6-10 meV. The low-energy mode is about twice as intense as the high-energy mode. The splitting of the modes is consistent with local C<sub>3v</sub> symmetry and analysed in terms of a model suggested recently by Bennington et al. Broadenings of the modes are observed and attributed to a weak splitting of the doubly degenerate low-energy mode due to a reduction of local symmetry. To relate the spectra to crystallographic properties a powder neutron-diffraction experiment and a refinement of the crystal structure of YBrD<sub>0.79</sub> have also been performed. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Optical vibrations of hydrogen in some rare-earth monohalide hydrides |
| Тип | paper |
| DOI | 10.1088/0953-8984/6/22/005 |
| Electronic ISSN | 1361-648X |
| Print ISSN | 0953-8984 |
| Журнал | Journal of Physics: Condensed Matter |
| Том | 6 |
| Первая страница | 4053 |
| Последняя страница | 4066 |
| Аффилиация | R K Kremer; MPI fur Festkorperforschung, Stuttgart, Germany |
| Аффилиация | J K Cockcroft; MPI fur Festkorperforschung, Stuttgart, Germany |
| Аффилиация | H Mattausch; MPI fur Festkorperforschung, Stuttgart, Germany |
| Аффилиация | A Simon; MPI fur Festkorperforschung, Stuttgart, Germany |
| Аффилиация | G J Kearley; MPI fur Festkorperforschung, Stuttgart, Germany |
| Выпуск | 22 |
