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Preparation of VO2 Superfine Powders by a Redox Method and In Situ Characterization on the Reversible Phase Transition
Zhang Shaohong; Fu Juan; Su Qiucheng; Fu Chunhong; Li Xinjun
2015-03-01
发表期刊RARE METAL MATERIALS AND ENGINEERING
卷号44期号:3页码:738-742
摘要Oxalic acid was chosen as the reductant to prepare superfine VO2 powders from V2O5 under high-purity N-2 atmosphere. The effect of V2O5:H2C2O4 molar ratio on the VO2 purity was investigated. X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) were applied to analyze the VO2 sample. The thermal induced reversible phase transition performance was characterized by simultaneous thermal analysis (STA) and in situ XRD. The results show that when the molar ratio of V2O5 to H2C2O4 is in the range from 1:1.2 to 1:1.4, relatively pure VO2 could be obtained. The as-prepared VO2 is superfine subspheroidal particles of uniform distribution. The mean crystallite size is about 50 nm. It has a reversible phase transition from a low temperature monoclinic phase (P21/c, M phase) to a high-temperature tetragonal phase (P42/mnm, rutile phase or R phase). The DSC curve of the heating-cooling cycles is asymmetrical thermal hysteresis loop. The multicycle loops are coincident well. There is an endothermic phase transition at 68.1 degrees C, and an exothermic phase transition at 60.2 degrees C, with 7.9 degrees C hysteresis.
文章类型Article
关键词Vanadium Dioxide Redox Thermal Induced Phase Transition Xrd Sta Thermal Hysteresis Loop
WOS标题词Science & Technology ; Technology
研究领域[WOS]Materials Science ; Metallurgy & Metallurgical Engineering
关键词[WOS]VANADIUM DIOXIDE ; THIN-FILMS ; TEMPERATURE ; BEHAVIOR
收录类别SCI
语种英语
WOS类目Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号WOS:000352249000043
引用统计
文献类型期刊论文
条目标识符http://ir.giec.ac.cn/handle/344007/9110
专题中国科学院广州能源研究所
作者单位Chinese Acad Sci, Guangzhou Inst Energy Convers, Key Lab Renewable Energy, Guangzhou 510640, Guangdong, Peoples R China
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GB/T 7714
Zhang Shaohong,Fu Juan,Su Qiucheng,et al. Preparation of VO2 Superfine Powders by a Redox Method and In Situ Characterization on the Reversible Phase Transition[J]. RARE METAL MATERIALS AND ENGINEERING,2015,44(3):738-742.
APA Zhang Shaohong,Fu Juan,Su Qiucheng,Fu Chunhong,&Li Xinjun.(2015).Preparation of VO2 Superfine Powders by a Redox Method and In Situ Characterization on the Reversible Phase Transition.RARE METAL MATERIALS AND ENGINEERING,44(3),738-742.
MLA Zhang Shaohong,et al."Preparation of VO2 Superfine Powders by a Redox Method and In Situ Characterization on the Reversible Phase Transition".RARE METAL MATERIALS AND ENGINEERING 44.3(2015):738-742.
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