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VO2(B)熱轉化為VO2(R)和V2O3的高溫XRD原位表征
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中國科學院廣州能源研究所,中國科學院廣州能源研究所,中國科學院廣州能源研究所,中國科學院廣州能源研究所,中國科學院廣州能源研究所

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國家自然科學基金項目（面上項目，重點項目，重大項目）;中國科學院重大資助項目


In situ characterization on thermal transitions of VO2(B): toward VO2(R) and V2O3
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Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences,Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences,Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences,Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences,Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences

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    摘要:

    以草酸和V2O5為原料，采用水熱法制備VO2(B)。通過高溫原位X射線衍射技術研究VO2(B)在氮氣保護下升高溫度過程中的相變特性，采用X射線衍射儀(XRD)和場發(fā)射掃描電子顯微鏡(FE-SEM)分析所制備樣品及其在不同溫度熱相變產物的微觀形貌和物相組成。結果表明：以草酸和V2O5為原料，用水熱法可制得單斜晶系VO2(B)，顆粒呈納米片狀；升溫至430~700℃，VO2(B)不可逆轉化為四方晶系VO2(R)，形貌由納米片狀變?yōu)閬單⒚准拔⒚捉蛐?；升溫?000℃左右，VO2(R)開始分解形成Magn閘i相系列化合物（VnO2n?1）；升溫至大約1200℃完全轉變?yōu)榫哂袆傆窠Y構的V2O3燒結塊。

    Abstract:

    VO2(B) was synthesized via a facile hydrothermal process using V2O5 and oxalic acid. The crystal structure and phase transition of VO2(B) during elevated temperatures in N2 were investigated by in situ X-ray diffraction (XRD). Meanwhile, the morphology and crystal structure of the samples obtained by annealing at different temperatures were characterized by Field Emission Scanning Electron Microscopy (FE-SEM) and XRD, respectively. The results show the as-synthesized nano platelet-like monoclinic VO2(B) irreversibly transforms into submicron and micron subsphaeroidal tetragonal VO2(R) between 430 and 700 oC. The as-obtained VO2(R) starts to decompose and form Magn閘i phases VnO2n?1 series compounds at 1000 oC, and totally transfers into a corundum V2O3 sintered block at ca. 1200 oC.

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張少鴻,付娟,蘇秋成,吳梁鵬,李新軍. VO2(B)熱轉化為VO2(R)和V2O3的高溫XRD原位表征[J].稀有金屬材料與工程,2016,45(6):1374~1380.[zhang shao hong, fu juan, su qiu cheng, wu liang peng, li xin jun. In situ characterization on thermal transitions of VO2(B): toward VO2(R) and V2O3[J]. Rare Metal Materials and Engineering,2016,45(6):1374~1380.]
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  • 收稿日期:2014-05-06
  • 最后修改日期:2014-06-03
  • 錄用日期:2014-07-01
  • 在線發(fā)布日期: 2016-10-08
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