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Structure of liquid mercury at high pressure

James W. E. Drewitt*, Francesco Turci, and Adrian C. Barnes

Benedict J. Heinen, Elena-Marie Rogmann, and Oliver T. Lord

Craig W. Wilson and Simon G. Macleod

Annette K. Kleppe

  • School of Physics, University of Bristol, H.H. Wills Physics Laboratory, Tyndall Avenue, Bristol BS8 1TL, United Kingdom

  • School of Earth Sciences, University of Bristol, Wills Memorial Building, Queens Road, Bristol BS8 1RJ, United Kingdom

  • *Contact author: james.drewitt@bristol.ac.uk
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Phys. Rev. B 113, 174201 – Published 14 May, 2026

DOI: https://doi.org/10.1103/nffz-z1g8

Abstract

The atomic-scale structure and melting curve of liquid mercury was measured using in situ synchrotron x-ray diffraction (SXRD) at pressure and temperature (p−T) conditions up to 9.44(2) GPa and 651(1) K. Ab initio molecular dynamics (AIMD) simulations were employed to obtain a detailed atomistic model of the liquid structure. The results reveal a pronounced flattening, and potential maximum, in the measured melting curve between 6 and 9 GPa. The structure factors SHgHg(Q) and pair distribution functions gHgHg(r) calculated from the AIMD simulations are in good overall agreement with the SXRD measurements under comparable reduced densities and temperatures, indicating that the atomistic structure of liquid Hg is well captured by AIMD. With increasing pressure, the principal peak in SHgHg(Q) shifts to higher Q, with the subsidiary peak at Q=2kF experiencing a concomitant shift consistent with the increased electron density. Considering the Evans t-matrix formulation of the Ziman theory of liquid metals, the structural S(2kF) term is expected to have only a weak influence on the electrical resistivity under compression. In contrast, the pressure-induced broadening and shift of the d-projected density of states towards the Fermi level is consistent with enhanced near-resonant d-electron scattering, and a corresponding increase in resistivity, analogous to the behavior of first-row transition metals. Analysis of the measured gHgHg(r) functions, and AIMD trajectories in real space, indicates that the liquid structure experiences a progressive development towards simple hard-sphere-like behavior at increasing p−T along the melting curve. However, topological cluster classification analysis shows that while the structural fingerprint of liquid Hg strongly resembles an effective hard-sphere system, even at the highest pressures investigated it contains more many-body motifs than expected for this simple model.

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Corrections

22 June, 2026

Correction: A redundant summation term has been removed from Eq. (3).

Article Text

Supplemental Material

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Outline

Information

Phys. Rev. B 113, 174201– Published 14 May, 2026
  • Received 17 February 2026
  • Revised 11 April 2026
  • Accepted 22 April 2026
  • Corrected 22 June 2026
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