Doubling of the Phase Transition Temperature of VO2 by Fe Doping.
J Phys Chem Lett
; 12(32): 7792-7796, 2021 Aug 19.
Article
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| MEDLINE
| ID: mdl-34374549
ABSTRACT
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.
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MEDLINE
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En
Revista:
J Phys Chem Lett
Año:
2021
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Article
País de afiliación:
Francia