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Researchers discovered a new high-pressure nickel-bismuth (Ni-Bi) phase, β-NiBi, which forms under pressure and reverts to the original phase upon release. This finding advances understanding of Ni-Bi phase behavior under extreme conditions.

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Area of Science:

  • Materials Science
  • Solid State Chemistry
  • High-Pressure Physics

Background:

  • The nickel-bismuth (Ni-Bi) system exhibits complex phase behavior.
  • Understanding material transformations under extreme conditions is crucial for developing novel applications.

Purpose of the Study:

  • To investigate the existence and structural characteristics of new phases in the Ni-Bi system under high-pressure conditions.
  • To characterize the formation and reversibility of high-pressure phases in Ni-Bi.

Main Methods:

  • In situ high-pressure and high-temperature powder X-ray diffraction was employed.
  • Crystallographic analysis was performed to determine the structure of the new phase.

Main Results:

  • A novel high-pressure phase, designated β-NiBi, was discovered.
  • β-NiBi crystallizes in the TlI structure type.
  • The formation of β-NiBi was observed to be reversible, with reconversion to the ambient pressure phase, α-NiBi.

Conclusions:

  • The Ni-Bi system exhibits a new high-pressure phase, β-NiBi.
  • High-pressure X-ray diffraction is effective for studying phase transitions in metallic systems.
  • The reversible nature of the β-NiBi phase formation offers potential for pressure-induced material property tuning.