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<p>Bismuth exhibits remarkable structural and thermodynamic behavior under pressure, as indicated by an anomalous melting curve, transitions between multiple low-symmetry solid allotropes, and multiple reports of liquid transitions. Despite extensive studies at ambient pressure, the structure of liquid Bi at high pressures remains poorly understood. Using synchrotron radiation energy-dispersive X-ray diffraction measurements, we investigate the liquid Bi structure just above the melting line over 1.0−4.0 GPa. Remarkably, the liquid structure remains unvarying as the underlying solid phases change dramatically. The first peak in the <i>g(r)</i> shifts ~ 0.004 nm to higher <i>r</i> values (~ 1%), despite increasing density, while the second peak moves ~ 0.01 nm to lower <i>r</i> values (~ 1.5%). Coordination numbers of the first and second shells increase with density. Structural analysis using the Quasi-Crystalline Model reveals a persistent Bi−I rhombohedral-like short-range order. These findings highlight unexpected structural stability in liquid bismuth under pressure, challenging conventional views on pressure-induced liquid transitions.</p>

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Invariance of liquid bismuth structure along the melting curve

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月12日

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  • Shir Ben Shalom,
  • Neta Ellert,
  • Laura Henry,
  • Moran Emuna,
  • Yuri Kirshon,
  • Pierre Piault,
  • Andrew King,
  • Nicolas Guignot,
  • Yaron Greenberg,
  • Eyal Yahel,
  • Guy Makov

摘要

Bismuth exhibits remarkable structural and thermodynamic behavior under pressure, as indicated by an anomalous melting curve, transitions between multiple low-symmetry solid allotropes, and multiple reports of liquid transitions. Despite extensive studies at ambient pressure, the structure of liquid Bi at high pressures remains poorly understood. Using synchrotron radiation energy-dispersive X-ray diffraction measurements, we investigate the liquid Bi structure just above the melting line over 1.0−4.0 GPa. Remarkably, the liquid structure remains unvarying as the underlying solid phases change dramatically. The first peak in the g(r) shifts ~ 0.004 nm to higher r values (~ 1%), despite increasing density, while the second peak moves ~ 0.01 nm to lower r values (~ 1.5%). Coordination numbers of the first and second shells increase with density. Structural analysis using the Quasi-Crystalline Model reveals a persistent Bi−I rhombohedral-like short-range order. These findings highlight unexpected structural stability in liquid bismuth under pressure, challenging conventional views on pressure-induced liquid transitions.