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The temperature-composition phase diagram of two solids, A and B, which are immiscible in the solid phase but form miscible liquids, shows that when the temperature is low, these two exist as separate, pure solids (A and B). As the temperature increases, they transition into a single-phase liquid solution where A and B coexist. Moving from point a1 to a2 in the phase diagram, the composition changes such that solid B begins to separate from the solution, enriching the remaining liquid with A.
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Stable compositions and structures in the Na-Bi system.

Xiyue Cheng1, Ronghan Li, Dianzhong Li

  • 1Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China. xingqiu.chen@imr.ac.cn.

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Summary
This summary is machine-generated.

Researchers explored sodium-bismuth (Na-Bi) compounds using first-principles calculations. They predicted new stable phases and structural transitions under pressure, expanding the understanding of topological materials.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Computational Chemistry

Background:

  • The sodium-bismuth (Na-Bi) binary system exhibits unique electronic properties, with Na3Bi and NaBi identified as a 3D topological Dirac semimetal and topological metal, respectively.
  • Understanding the phase stability and electronic behavior of Na-Bi compounds under varying pressures is crucial for discovering new materials with exotic electronic characteristics.

Purpose of the Study:

  • To systematically investigate the phase stabilities, crystal structures, and electronic properties of the Na-Bi binary system using first-principles calculations and evolutionary structural searches.
  • To predict new, experimentally synthesizable Na-Bi compounds and their pressure-induced phase transitions.
  • To elucidate the charge transfer mechanisms and localization effects within these compounds.

Main Methods:

  • Utilized first-principles calculations to determine ground-state energies and electronic structures.
  • Employed evolutionary structural searches to explore the Na-Bi phase diagram.
  • Analyzed pressure-dependent structural phase transitions and predicted new compound stabilities.

Main Results:

  • Successfully reproduced experimentally observed Na3Bi and NaBi structures at ambient pressure.
  • Identified pressure-induced phase transitions for Na3Bi (to cubic cF16 at 0.8 GPa, then insulating oC16 at 118 GPa) and NaBi (to cubic cP2 at 36 GPa).
  • Predicted four novel Na-Bi compounds (Na6Bi, Na4Bi, Na2Bi, NaBi2) synthesizable at high pressures (38-171 GPa).
  • Observed common charge transfer from Na to Bi, with interstitial charge localization in Na cages for Na6Bi and Na4Bi.

Conclusions:

  • The Na-Bi system exhibits complex phase behavior under pressure, with potential for novel topological electronic states in high-pressure phases.
  • New Na-Bi compounds with unique compositions are predicted to be stable under high pressure, expanding the landscape of known materials.
  • Charge localization in Na atomic cages appears linked to specific compositions and Na environments, offering insights into bonding.