Reversible switching between pressure-induced amorphization and thermal-driven recrystallization in VO2(B) nanosheets

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Pressure-induced amorphization (PIA) and thermal recrystallization are known phenomena in crystalline materials.
• Controllable switching between PIA and metastable phases remains a significant challenge due to precise control difficulties.

Purpose of the Study:

• To demonstrate reversible switching between PIA and thermally-driven recrystallization in VO2(B) nanosheets.
• To establish precise conditions for these reversible phase transformations.

Main Methods:

• In situ experiments to observe phase transformations under controlled pressure and temperature.
• Spectral analysis and theoretical calculations to understand pressure-structure relationships.
• Resistivity measurements to study electrical properties during phase transitions.

Main Results:

• Achieved reversible switching between PIA and recrystallization in VO2(B) nanosheets.
• Identified the role of flexible VOx polyhedra in structural switching.
• Observed anomalous resistivity evolution and spin participation in the phase transition.

Conclusions:

• Demonstrated a novel method for controllable phase switching in materials.
• Findings have implications for designing phase-switching devices.
• Opens avenues for exploring hidden amorphous materials.