High pressure transformations in liquid rubidium
| Autor: | Ayrinhac, Simon, Robinson, Victor Naden, Decremps, Frédéric, Gauthier, Michel, Antonangeli, Daniele, Scandolo, Sandro, Morand, Marc |
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| Přispěvatelé: | Institut de minéralogie, de physique des matériaux et de cosmochimie (IMPMC), Muséum national d'Histoire naturelle (MNHN)-Institut de recherche pour le développement [IRD] : UR206-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Abdus Salam International Centre for Theoretical Physics [Trieste] (ICTP) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Phase transition
Materials science Physics and Astronomy (miscellaneous) [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] chemistry.chemical_element 02 engineering and technology 01 natural sciences Molecular physics Rubidium chemistry.chemical_compound Condensed Matter::Materials Science Ab initio quantum chemistry methods Condensed Matter::Superconductivity 0103 physical sciences General Materials Science [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat] 010306 general physics [SPI.ACOU]Engineering Sciences [physics]/Acoustics [physics.class-ph] Bulk modulus 021001 nanoscience & nanotechnology [PHYS.MECA.ACOU]Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph] Condensed Matter::Soft Condensed Matter chemistry Picosecond Caesium [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] Electride [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph] 0210 nano-technology Valence electron |
| Zdroj: | Physical Review Materials Physical Review Materials, American Physical Society, In press Physical Review Materials, American Physical Society, 2020, 4 (11), pp.113611. ⟨10.1103/physrevmaterials.4.113611⟩ Physical Review Materials, 2020, 4 (11), pp.113611. ⟨10.1103/physrevmaterials.4.113611⟩ Physical Review Materials, 2020, ⟨10.1103/PhysRevMaterials.4.113611⟩ |
| ISSN: | 2475-9953 |
| Popis: | International audience; An electronic-driven liquid-liquid phase transition in rubidium is revealed by picosecond acoustic measurements combined with ab initio calculations. Picosecond acoustics were used to measure the melting line up to 10 GPa, finding the maximum in the melting curve at 7 GPa and 555 K. We observe the onset of a continuous liquid-liquid phase transition beginning around the melting maxima through until 16 GPa. Sound velocity shows a softening similar to that reported for liquid caesium, caused by a change in the bulk modulus during a crossover from the low-density to the high-density liquid. Guided by the ab initio calculations, we relate the changes in the thermo-elastic properties to the progressive localization of the valence electrons in the pressure range of 6-16 GPa. At high pressure rubidium forms an electride liquid quantified by the appearance of interstitial quasi atoms (ISQs) localised in the valence electron density. |
| Databáze: | OpenAIRE |
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