Simple-to-Complex Transformation in Liquid Rubidium

The Journal of Physical Chemistry Letters
Federico A GorelliMario Santoro

Abstract

We investigated the atomic structure of liquid Rb along an isothermal path at 573 K, up to 23 GPa, by X-ray diffraction measurements. By raising the pressure, we observed a liquid-liquid transformation from a simple metallic liquid to a complex one. The transition occurs at 7.5 ± 1 GPa which is slightly above the first maximum of the T-P melting line. This transformation is traced back to the density-induced hybridization of highest electronic orbitals leading to the accumulation of valence electrons between Rb atoms and to the formation of interstitial atomic shells, a behavior that Rb shares with Cs and is likely to be common to all alkali metals.

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Citations

Jul 22, 2019·Scientific Reports·Nikita P KryuchkovStanislav O Yurchenko
Jul 22, 2020·The Journal of Physical Chemistry. B·Yu ShuGuoyin Shen
Sep 21, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·James W E Drewitt

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