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Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model
Published on: May 23, 2018
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Pressure-Temperature Phase Diagram of Vanadium Dioxide
Yabin Chen, Shuai Zhang, Feng Ke1
1Center for High Pressure Science and Technology Advanced Research , Shanghai 201203, China.
Nano Letters
|March 8, 2017
Summary
Researchers mapped the pressure-temperature phase diagram for vanadium dioxide nanobeams. New insulating and metallic phases were discovered at high pressures, revealing insights into vanadium dioxide
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanotechnology
Background:
- Vanadium dioxide exhibits complex phase transitions driven by strongly correlated electron physics.
- Understanding these transitions is key to harnessing its unique properties.
Purpose of the Study:
- To map the hydrostatic pressure-temperature phase diagram of vanadium dioxide nanobeams.
- To identify and characterize novel phases under high pressure conditions.
Main Methods:
- Utilized a diamond anvil cell to independently vary pressure and temperature.
- Performed systematic optical and electrical measurements.
- Employed density functional theory calculations.
Main Results:
- Identified the known insulating M1 and metallic R phases.
- Discovered a new high-pressure insulating M1' phase (monoclinic).
- Revealed two new metallic phases: X (monoclinic) and O (orthorhombic, high temperature).
Conclusions:
- The study delineates phase boundaries and basic transition features of vanadium dioxide.
- High pressure reveals a richer phase landscape for vanadium dioxide than previously known.
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