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Related Experiment Video

Updated: May 6, 2026

Assembly of Complex Microtubule Structures

Assembly of Complex Microtubule Structures

Electronic and structural transitions in dense liquid sodium.

Jean-Yves Raty¹, Eric Schwegler, Stanimir A Bonev

¹FNRS-University of Liège, Sart-Tilman 4000, Belgium. jyraty@ulg.ac.be

|September 28, 2007

Summary

This summary is machine-generated.

High pressure transforms liquid sodium, causing structural and electronic changes. This leads to a lower-coordinated liquid with a pseudogap, explaining unusual melting behavior in dense sodium.

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Area of Science:

Condensed Matter Physics
Materials Science
Computational Chemistry

Background:

Light alkali metals like sodium exhibit simple structures at ambient conditions.
Under high pressure, solid lithium and sodium undergo symmetry-breaking transitions.
The melting curve of sodium shows an unexplained drop in temperature at high pressures.

Purpose of the Study:

To explain the unusual melting behavior of dense sodium.
To investigate pressure-induced transitions in molten sodium.
To understand the electronic and structural changes in liquid sodium under extreme conditions.

Main Methods:

Ab initio calculations were employed to simulate dense sodium.
The study analyzed structural and electronic transitions in molten sodium.
Electrical conductivity and electronic density of states were examined.

Main Results:

Molten sodium undergoes pressure-induced structural and electronic transitions at lower pressures than solids.
A transition to a lower-coordinated liquid occurs around 65 GPa, marked by a drop in electrical conductivity.
This transition is driven by the formation of a pseudogap at the Fermi level in the electronic density of states.

Conclusions:

The study explains the anomalous melting behavior of sodium via pressure-induced liquid-state transitions.
A novel electronic transition (pseudogap opening) in a liquid metal was observed.
Similar exotic behavior may occur in other materials under pressure.