Abstract
A powder sample of fcc (γ) cobalt hydride was synthesised under a pressure of 9 GPa and a temperature of 350 ° C and then studied at ambient pressure by neutron diffraction at 95 K and by inelastic neutron scattering (INS) at 5 K in the range of energy transfers 30-380 meV. A profile analysis of the neutron diffraction pattern showed that hydrogen occupies octahedral interstitial sites in the fcc metal lattice of γ-CoH with a=3.7124(5) Å. The INS investigation demonstrated that the fundamental band of optical hydrogen vibrations consists of a strong peak at 102 meV with a broad shoulder towards higher energies. This intensity distribution is typical of hcp and fcc monohydrides of 3d- and 4d-metals, and the peak position as a function of the hydrogen-metal distance agrees with the dependence established for those hydrides earlier.
| Original language | English |
|---|---|
| Pages (from-to) | 73-76 |
| Number of pages | 4 |
| Journal | Journal of Alloys and Compounds |
| Volume | 404-406 |
| Issue number | SPEC. ISS. |
| DOIs | |
| State | Published - Dec 8 2005 |
| Externally published | Yes |
Funding
This work was supported by grant No. 02-02-16859 from the Russian Foundation for Basic Research and by the Program “Physics and Mechanics of Strongly Compressed Matter” of the Russian Academy of Sciences.
Keywords
- Diffraction
- Interstitial alloys
- Neutron scattering