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Dynamic transition in supercritical iron.

Yu D Fomin1, V N Ryzhov1, E N Tsiok2

  • 11] Institute for High Pressure Physics, Russian Academy of Sciences, Troitsk 142190, Moscow, Russia [2] Moscow Institute of Physics and Technology, Dolgoprudny, Moscow Region 141700, Russia.

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Summary
This summary is machine-generated.

Scientists mapped the Frenkel line in supercritical iron, distinguishing rigid liquid from gas-like states. This finding helps predict planetary core conditions and iron conductivity.

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Area of Science:

  • Materials Science
  • Planetary Science
  • Thermodynamics

Background:

  • The supercritical state of matter exhibits distinct phases above the critical point.
  • The Frenkel line delineates these phases: a rigid liquid and a non-rigid gas-like fluid.
  • The precise location of the Frenkel line is unknown for many critical real-world systems.

Purpose of the Study:

  • To map the Frenkel line on the phase diagram of supercritical iron.
  • To develop a general method for locating the Frenkel line in any system using only melting line data.
  • To investigate the link between the Frenkel line and the metal-insulator transition in supercritical metals.

Main Methods:

  • Utilizing molecular dynamics simulations to model supercritical iron.
  • Analyzing phase transitions and fluid properties.
  • Developing a universal recipe for Frenkel line determination based on melting curves.

Main Results:

  • The Frenkel line for supercritical iron was successfully mapped.
  • A novel, system-independent method for locating the Frenkel line was proposed, relying solely on melting line data.
  • Supercritical iron in Jupiter's core was predicted to be in a rigid liquid state and highly conductive.

Conclusions:

  • The proposed method simplifies Frenkel line identification across various systems.
  • Supercritical iron's conductivity and state are predictable under planetary core conditions.
  • Planetary cooling drives the transition to a conductive rigid-liquid state in planetary cores at the Frenkel line.