Elasticity and Poisson's ratio of hexagonal close-packed hydrogen at high pressures
| Autor: | M. Morand, Yu. A. Freiman, Frédéric Decremps, Simon Ayrinhac, S. M. Tretyak, Daniele Antonangeli, Alexander F. Goncharov, Michel Gauthier, Alexei Grechnev |
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| Přispěvatelé: | Geophysical Laboratory [Carnegie Institution], Carnegie Institution for Science [Washington], Institut de minéralogie, de physique des matériaux et de cosmochimie (IMPMC), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de recherche pour le développement [IRD] : UR206-Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS), B. Verkin Institute for Low Temperature Physics and Engineering (ILTPE), National Academy of Sciences of Ukraine (NASU), Carnegie Institution for Science, Muséum national d'Histoire naturelle (MNHN)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de recherche pour le développement [IRD] : UR206-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2017 |
| Předmět: |
Physics
Condensed matter physics Hydrogen Close-packing of equal spheres chemistry.chemical_element 02 engineering and technology 021001 nanoscience & nanotechnology 7. Clean energy 01 natural sciences Isothermal process Poisson's ratio [PHYS.MECA.MEMA]Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph] Condensed Matter::Materials Science symbols.namesake chemistry Solid hydrogen High pressure 0103 physical sciences symbols Elasticity (economics) 010306 general physics 0210 nano-technology Adiabatic process |
| Zdroj: | Physical Review B: Condensed Matter and Materials Physics (1998-2015) Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2017, 95 (21), pp.214104 ⟨10.1103/PhysRevB.95.214104⟩ Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2017, 95 (21), pp.214104 ⟨10.1103/PhysRevB.95.214104⟩ |
| ISSN: | 2469-9969 2469-9950 1098-0121 1550-235X |
| DOI: | 10.1103/physrevb.95.214104 |
| Popis: | The elasticity at high pressure of solid hydrogen in hexagonal close-packed (hcp) phase I has been examined experimentally by laser acoustics technique in a diamond anvil cell, up to 55 GPa at 296 K, and theoretically using pair and three-body semiempirical potentials, up to 160 GPa. In the experiments on ${\mathrm{H}}_{2}$ and ${\mathrm{D}}_{2}$, the compressional sound velocity has been measured; the Poisson's ratio has been determined by combining these data with the previously reported equation of state. At room temperature, the difference between the adiabatic and isothermal processes vanishes above 25 GPa but cannot be neglected at lower pressure. Theoretically, all five elastic constants of hcp hydrogen have been calculated, and various derived elastic quantities are presented. The elastic anisotropy of hcp hydrogen was found to be significant, with $\mathrm{\ensuremath{\Delta}}P\ensuremath{\approx}1.2,\phantom{\rule{0.16em}{0ex}}\mathrm{\ensuremath{\Delta}}{S}_{1}\ensuremath{\approx}1.7$, and $\mathrm{\ensuremath{\Delta}}{S}_{2}\ensuremath{\approx}1$. Calculations suggest the Poisson's ratio to decrease with pressure reaching a minimum value of 0.28 at 145 GPa. In the experiment, the Poisson's ratio is also found to decrease with pressure. Theoretical calculations show that the inclusion of zero-point vibrations on the elastic properties of ${\mathrm{H}}_{2}$ does not result in any drastic changes of the behavior of the elastic quantities. |
| Databáze: | OpenAIRE |
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