High-pressure discovery of β-NiBi

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.