Optical properties and structural phase transitions of W-doped VO2(R) under pressure

doi:10.1039/c7ra04605g

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	Optical properties and structural phase transitions of W-doped VO2(R) under pressure
	Zhang, HF; Guan, Z; Cheng, BY; Li, QJ; Liu, R; Zhang, J; Liu, ZX; Yang, K; Cui, T; Liu, BB
刊名	RSC ADVANCES
	2017
卷号	7 期号:50 页码:31597-31602
关键词	Metal-insulator-transition Vanadium Dioxide Temperature Dependence Transformation Nanocrystals Oxides Films
ISSN号	2046-2069
DOI	10.1039/c7ra04605g
文献子类	期刊论文
英文摘要	Weinvestigated the optical properties and structural phase transitions of W-doped VO2(R) nanoparticles under pressure based on in situ synchrotron X-ray diffraction (XRD) and infrared (IR) spectroscopy. The structural transition sequence follows VO2(R)-VO2(CaCl2- type)-VO2(Mx) and VO2(Mx)-VO2(Mx') within metallic phases, in compression and decompression processes, respectively, demonstrating that the structural transition can be decoupled from the metal-insulator transition (MIT). VO2(R) and VO2(CaCl2-type) exhibit expected behavior of increased metallicity under pressure; surprisingly, VO2(Mx) shows gradually decreased metallicity with increasing pressure and VO2(Mx') is still metallic under ambient conditions. We find that the reduced metallicity of VO2(Mx) is attributed to W-doping induced local structure distortion in the highpressure region, while the metallic properties of VO2(Mx') are associated with the enhancement of electron concentration due to the presence of W donors, which shifted the Fermi level toward the conduction band. The present results demonstrate that the structural transition is not the key factor in driving the metal-insulator transition, and provide an effective method for inducing MIT in VO2(Mx').
WOS关键词	METAL-INSULATOR-TRANSITION ; VANADIUM DIOXIDE ; TEMPERATURE ; DEPENDENCE ; TRANSFORMATION ; NANOCRYSTALS ; OXIDES ; FILMS
语种	英语
WOS记录号	WOS:000404076400054
内容类型	期刊论文
源URL	[http://ir.sinap.ac.cn/handle/331007/28762]
专题	上海应用物理研究所_中科院上海应用物理研究所2011-2017年
推荐引用方式 GB/T 7714	Zhang, HF,Guan, Z,Cheng, BY,et al. Optical properties and structural phase transitions of W-doped VO2(R) under pressure[J]. RSC ADVANCES,2017,7(50):31597-31602.
APA	Zhang, HF.,Guan, Z.,Cheng, BY.,Li, QJ.,Liu, R.,...&Liu, BB.(2017).Optical properties and structural phase transitions of W-doped VO2(R) under pressure.RSC ADVANCES,7(50),31597-31602.
MLA	Zhang, HF,et al."Optical properties and structural phase transitions of W-doped VO2(R) under pressure".RSC ADVANCES 7.50(2017):31597-31602.