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• W4220951566 abstract "Vanadium dioxide (VO2) exhibits a metal-insulator phase transition at approximately 70 °C. Two different crystal structures, M1 and M2 phases, in the insulating state have been reported. The M2 phase is expected to be a Mott insulator, whereas the M1 phase is expected to act as a band insulator. It is important to clarify the origin and transition properties of the M2 phase. In this study, we fabricated VO2 nanostructures via sputtering deposition and subsequent lamp annealing at various O2 pressures. Temperature-dependent XRD measurements revealed that the nanostructured VO2 exhibits the M2 phase in temperatures just before the phase transition from M1 to R (metal state) during the heating process. The ratio of V5+/(V4+ + V5+) in nanostructured VO2 was estimated from XPS results; an increase in this ratio resulted in the broadening of the temperature range of the M2 phase. Furthermore, in the cooling process, direct phase transitions from R to M1 were observed. Structural changes are likely to occur in different pathways during heating and cooling. Our findings should contribute to the identification of the phase transition mechanism and to the development of a Mott field-effect transistor that utilizes nanostructured VO2 in the M2 phase." @default.
• W4220951566 created "2022-04-03" @default.
• W4220951566 creator A5052736282 @default.
• W4220951566 creator A5073619436 @default.
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• W4220951566 date "2022-03-07" @default.
• W4220951566 modified "2023-09-27" @default.
• W4220951566 title "Phase transition behavior in nanostructured VO₂ with M1, M2, and R phases observed via temperature-dependent XRD measurements" @default.
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• W4220951566 doi "https://doi.org/10.1116/6.0001705" @default.
• W4220951566 hasPublicationYear "2022" @default.
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