Effect of grain sizes on the metal-semiconductor phase transition in vanadium dioxide polycrystalline thin films

Aliev, R. A.; Андреев, В. Н.; Kapralova, V. M.; Klimov, V. A.; Соболев, А. Н.; Shadrin, E. B.

doi:10.1134/s1063783406050180

Cited by 46 publications

(33 citation statements)

References 7 publications

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“…Only at the instant when the critical concentration of broken dimers at the temperature T = T c + ΔT is attained, a nucleus of the new tetragonal phase located within the old phase extends over the whole VO 2 film nanocrystal at the speed of sound, thus reflecting the martensitic character of the PT in VO 2 . (Here, ΔT is the deviation of temperature from T c ; the deviation is necessary for a viable overcritical sized martensitic nucleus of the new phase to be formed [16,17].) Thus, only at the point T = T c + ΔT on the temperature scale, the mate rial exhibits a stepwise structural PT to the new tetrag onal metal phase under the influence of forces that are produced by σ bonds of the oxygen octahedrons and vanadium ions that are returning to the centers of these octahedrons (Fig.…”

Section: 3mentioning

confidence: 99%

Phase transition and correlation effects in vanadium dioxide

2012

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Section: 3mentioning

confidence: 99%

Phase transition and correlation effects in vanadium dioxide

2012

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“…The limitations are not as stringent as they may seem, though, and it should be observed that metallic vanadium can be transformed to VO 2 by controlled oxidation [121][122][123][124] and that insulating V 2 O 5 van be transformed to VO 2 by controlled reduction in films. [125][126][127] There is a tendency that limited dimensions decreases c and widens the hysteresis in nanocrystalline films 46,48,[128][129][130][131][132][133][134][135] and nanorods. 27,28,81,90,118 This may be associated with internal stress in the particles.…”

Section: Discussionmentioning

confidence: 99%

Nanothermochromics: Calculations for VO2 nanoparticles in dielectric hosts show much improved luminous transmittance and solar energy transmittance modulation

Li¹,

Niklasson²,

Granqvist³

2010

Journal of Applied Physics

241

192

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VO 2 -based films are thermochromic and show infrared reflectance above a "critical" temperature in the vicinity of room temperature. Implementations on energy efficient windows have been discussed for decades but have been severely curtailed since the luminous absorptance is undesirably large and the solar energy transmittance modulation is too small. Here we show by calculations based on effective medium theory that dilute composites with VO 2 nanoparticles embedded in hosts with properties mimicking glass or polymer can yield significantly decreased luminous absorption jointly with much enhanced transmittance modulation of solar energy. These results demonstrate that VO 2 -based nanothermochromics opens new avenues toward energy efficient fenestration.

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“…Therefore, there is usually no step observed in relatively narrow hysteresis loops. [86][87] It is believed that any models related to the steps in the hysteresis loops should take the influence of grain boundary into account. For Sample IV (annealed for 180 min), the step seems to be depressed (inset of Figure 15d).…”

Section: The Methodsmentioning

confidence: 99%