Towards a metallic YH3 phase at high pressure
| Autor: | J. N. Huiberts, Michael Hanfland, Federico Zontone, R.P. Griessen, J.H. Rector, Rinke J. Wijngaarden, D.G. Nagengast |
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| Přispěvatelé: | Photo Conversion Materials, Physics and Astronomy |
| Jazyk: | angličtina |
| Rok vydání: | 2000 |
| Předmět: |
Phase transition
Condensed matter physics Hydrogen Chemistry Band gap Mechanical Engineering Metals and Alloys Synchrotron radiation chemistry.chemical_element Condensed Matter::Materials Science Crystallography Mechanics of Materials Lattice (order) Materials Chemistry Interstitial compound Condensed Matter::Strongly Correlated Electrons SDG 7 - Affordable and Clean Energy Metal–insulator transition Electronic band structure |
| Zdroj: | Journal of Alloys and Compounds, 308, 44-48. Elsevier BV Wijngaarden, R J, Huiberts, J N, Nagengast, D G, Rector, J H, Griessen, R P, Hanfland, M & Zontone, F 2000, ' Towards a metallic YH3 phase at high pressure ', Journal of Alloys and Compounds, vol. 308, pp. 44-48 . https://doi.org/10.1016/S0925-8388(00)00913-0 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/s0925-8388(00)00913-0 |
| Popis: | The switchable mirror compound YH 3 has a high-pressure behavior at variance with current band-structure models. It remains transparent at least up to 25 GPa. At high pressure, the optical gap decreases linearly extrapolating to zero for 55±8 GPa, above which pressure a metallic state is expected. This is in disagreement with a theoretically predicted insulator-to-metal phase transition at 1.5 GPa. In-situ structural studies using synchrotron radiation reveal a 2% drop in the c -lattice vector at 4 GPa, while both above and below the phase transition, the spectra are consistent with a hcp structure. Hence this phase transition is probably due to a rearrangement of the hydrogen lattice positions only and the predicted hcp to fcc transition is not observed. |
| Databáze: | OpenAIRE |
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