Effect of nonstoichiometry on Raman scattering of VO
                    <sub>2</sub>
                    films

Hongtao, Yuan; Feng, Kai; Wang, Xuejin; Li, Chao; He, Chenjuan; Nie, Yonggang

doi:10.1088/1009-1963/13/1/015

Cited by 22 publications

(2 citation statements)

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“…We notice that the same shift of the O and V 1 peak observed in x = 0.025 doped sample has been previously observed in nonstoichiometric VO 2 samples, as reported in Ref. 34. This finding suggests that the presence of V 3+ or V 5+ in nonstoichiometric VO 2 stabilizes the M2 phase, as well as the Cr impurities.…”

Section: Ambient Condition Raman Spectrasupporting

confidence: 89%

Optical properties ofV1−xCrxO2compounds under high pressure

Marini

Arcangeletti²,

Castro³

et al. 2008

Phys. Rev. B

182

109

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Raman and infrared transmission and reflectivity measurements were carried out at room temperature and high pressure ͑0-15 GPa͒ on V 1−x Cr x O 2 compounds. Raman spectra were collected at ambient conditions on the x = 0.007 and 0.025 materials, which are characterized by different insulating monoclinic phases ͑M3 and M2, respectively͒, while infrared spectra were collected on the x = 0.025 sample only. The present data were compared with companion results on undoped VO 2 ͓E. Arcangeletti et al., Phys. Rev. Lett. 98, 196406 ͑2007͔͒, which is found at ambient conditions in a different, third insulating monoclinic phase, named M1. This comparison allowed us to investigate the effects of different extents of structural distortions ͑Peierls distortion͒ on the lattice dynamics and the electronic properties of this family of compounds. The pressure dependence of the Raman spectrum of VO 2 and Cr-doped samples shows that all the systems retain the monoclinic structure up to the highest explored pressure, regardless the specific monoclinic structure ͑M1, M2, and M3͒ at ambient condition. Moreover, the Raman spectra of the two Cr-doped samples, which exhibit an anomalous behavior over the low-pressure range ͑P Ͻ 8 GPa͒, merge into that of VO 2 in the high-pressure regime and are all found into a common monoclinic phase ͑a possible fourth kind phase͒. Combining Raman and infrared results on both the VO 2 and the present data, we found that a common metallic monoclinic phase appears accessible in the high-pressure regime at room temperature for both undoped and Cr-doped samples independently of the different extents of Peierls distortion at ambient conditions. This finding differs from the behavior observed at ambient pressure, where the metallic phase is found only in conjunction with the rutile structure. The whole of these results suggests a major role of the electron correlations, rather than of the Peierls distortion, in driving the metal-insulator transition in vanadium dioxide systems, thus opening to new experimental and theoretical queries.

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Section: Ambient Condition Raman Spectrasupporting

confidence: 89%

Optical properties ofV1−xCrxO2compounds under high pressure

Marini

Arcangeletti²,

Castro³

et al. 2008

Phys. Rev. B

182

109

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“…Later, Chen et al , reported that V vacancies lead to acceptor doping, whereas O vacancies lead to donor doping, corresponding to the reduced phase transition temperature of VO 2 . It has been recently accepted that a slight deviation in the concentration of intrinsic point defects contributes to an obvious difference in the thermochromic behavior of VO 2 . − …”

Section: Vanadium Dioxidementioning

confidence: 99%

Thermochromic Energy Efficient Windows: Fundamentals, Recent Advances, and Perspectives

Zhang

Zhou

et al. 2023

Chem. Rev.

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Thermochromic energy efficient windows represent an important protocol technology for advanced architectural windows with energy-saving capabilities through the intelligent regulation of indoor solar irradiation and the modulation of window optical properties in response to real-time temperature stimuli. In this review, recent progress in some promising thermochromic systems is summarized from the aspects of structures, the micro-/mesoscale regulation of thermochromic properties, and integration with other emerging energy techniques. Furthermore, the challenges and opportunities in thermochromic energy-efficient windows are outlined to promote future scientific investigations and practical applications in building energy conservation.

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Plasma‐Aided Nanofabrication

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Effect of nonstoichiometry on Raman scattering of VO ₂ films

Cited by 22 publications

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Optical properties ofV1−xCrxO2compounds under high pressure

Optical properties ofV1−xCrxO2compounds under high pressure

Thermochromic Energy Efficient Windows: Fundamentals, Recent Advances, and Perspectives

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Effect of nonstoichiometry on Raman scattering of VO 2 films

Cited by 22 publications

References 0 publications

Optical properties ofV1−xCrxO2compounds under high pressure

Optical properties ofV1−xCrxO2compounds under high pressure

Thermochromic Energy Efficient Windows: Fundamentals, Recent Advances, and Perspectives

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Effect of nonstoichiometry on Raman scattering of VO ₂ films