Simple-to-Complex Transformation in Liquid Rubidium

Year: 2018

Authors: Gorelli FA., De Panfilis S., Bryk T., Ulivi L., Garbarino G., Parisiades P., Santoro M .

Autors Affiliation: INO CNR, I-50019 Sesto Fiorentino, Italy; European Lab Non Linear Spect, LENS, I-50019 Sesto Fiorentino, Italy; Ist Italiano Tecnol, Ctr Life Nano Sci IIT Sapienza, I-00161 Rome, Italy; NASU, Inst Condensed Matter Phys, UA-79011 Lvov, Ukraine; IFAC CNR, I-50019 Sesto Fiorentino, Italy; European Synchrotron Res Facil, FR-38043 Grenoble, France.

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.

Journal/Review: JOURNAL OF PHYSICAL CHEMISTRY LETTERS

Volume: 9 (11)      Pages from: 2909  to: 2913

More Information: F.A.G., M.S., and L.U. acknowledge the PRIN project ZAPPING, number 2015HK93L7, granted by the Italian Ministry of Education, Universities and Research, MIUR, supporting their research in high-pressure materials science.
KeyWords: Phase-transition; Pressure; Diagram; Behavior; Elements; Density; Metals; Iv
DOI: 10.1021/acs.jpclett.8b01094

Citations: 21
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