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Simple-to-Complex Transformation in Liquid Rubidium.

Federico A Gorelli1,2, Simone De Panfilis3, Taras Bryk4

  • 1INO-CNR , I-50019 Sesto Fiorentino , Italy.

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This summary is machine-generated.

High pressure transforms simple liquid rubidium (Rb) into a complex liquid at 7.5 GPa. This liquid-liquid transition is driven by electronic orbital hybridization and electron shell formation, a phenomenon likely common to alkali metals.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • High-pressure physics

Background:

  • Alkali metals exhibit unique phase transitions under extreme conditions.
  • Understanding liquid metal behavior at high pressures is crucial for materials science.

Purpose of the Study:

  • To investigate the atomic structure of liquid rubidium (Rb) under high pressure.
  • To identify and characterize any phase transitions in liquid Rb up to 23 GPa.

Main Methods:

  • X-ray diffraction measurements were employed to probe the atomic structure.
  • Experiments were conducted along an isothermal path at 573 K.
  • Pressures were varied up to 23 GPa.

Main Results:

  • A liquid-liquid phase transformation was observed in Rb at 7.5 ± 1 GPa.
  • This transition marks a change from a simple metallic liquid to a complex liquid.
  • The transformation is linked to density-induced hybridization of electronic orbitals.

Conclusions:

  • High pressure induces significant structural changes in liquid Rb.
  • The observed transformation is attributed to electronic orbital hybridization and interstitial atomic shell formation.
  • This behavior in Rb suggests a commonality among alkali metals under pressure.