An equation of state for expanded metals.
W Schirmacher1, W-C Pilgrim2, F Hensel2
1Institut für Physik, Johannes-Gutenberg-Universität Mainz, Staudinger Weg 9, D-55099 Mainz, Germany.
Journal of Physics. Condensed Matter : an Institute of Physics Journal
|September 9, 2020
Summary
This study introduces a new equation of state for expanded metals, revealing a second coexistence line in the phase diagram. This indicates a phase separation between metallic and nonmetallic liquid states, confirming long-standing theories.
Area of Science:
- Condensed matter physics
- Materials science
- Thermodynamics
Background:
- Understanding the behavior of expanded metals under extreme conditions is crucial.
- Previous theoretical work by Zel'dovich and Landau predicted complex phase behavior in metallic systems.
Purpose of the Study:
- To develop a theoretical model for the equation of state of expanded metals.
- To investigate the possibility of phase separation in metallic liquids.
Main Methods:
- A model equation of state was formulated.
- Incorporated a pressure term with a screened-Coulomb potential.
- The screening parameter reflects the Mott-Anderson metal-to-nonmetal transition.
Main Results:
- The model predicts a second coexistence line in the phase diagram of expanded metals.
- This line signifies a phase separation phenomenon.
- The results align with theoretical predictions made decades ago.
Conclusions:
- The proposed equation of state successfully models phase separation in expanded metals.
- The findings confirm the existence of distinct metallic and nonmetallic liquid phases.
- This work provides a theoretical framework for understanding metal-nonmetal transitions.
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