VICTOR, Jean-Louis; GAUDON, Manuel; SALVATORI, Giorgio; TOULEMONDE, Olivier; PENIN, Nicolas; ROUGIER, Aline

doi:10.1021/acs.jpclett.1c02179

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VICTOR, Jean-Louis
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

GAUDON, Manuel
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

SALVATORI, Giorgio
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Journal of Physical Chemistry Letters. 2021, vol. 12, n° 32, p. 7792–7796

American Chemical Society

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Vanadium dioxide (VO2) undergoes a fully reversible first-order metal–insulator transition from the M1 monoclinic phase (P21/c) to a high-temperature tetragonal phase (P42/mnm) at around 68 °C. Modulation of the phase transition of VO2 by chemical doping is of fundamental and technological interest. Here, we report the synthesis of highly crystallized Fe-doped VO2 powders by a carbo-thermal reduction process. The impact of Fe doping on the structural and phase transition of VO2 is studied. The as-prepared Fe-doped VO2 samples crystallize in the M2 monoclinic form (C2/m), which is linked to segregation of the doping ions in the V2 zigzag chains. A large increase in the transition temperature to 134 °C is observed, which does correspond to a breakthrough in VO2-type thermochromic materials.< Leer menos

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Impurities

Granular materials

Differential scanning calorimetry

Phase transitions

Doping

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Doubling of the phase transition temperature of VO2 by Fe doping

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