超细VO2粉末的制备及其可逆相变的原位表征
RARE METAL MATERIALS AND ENGINEERING（2015）
Abstract
采用氧化还原法,在N2保护气氛中,通过程序控温,用草酸还原V2O5制备VO2超细粉末,重点考察原料配比对还原产物物相纯度的影响.采用X射线衍射仪(XRD)和扫描电子显微镜(SEM)及X射线能量色散谱仪(EDS)分析产物的相组成和微观形貌,通过同步热分析(STA)和原位XRD研究VO2粉体的热致可逆相变特性.结果表明:V2O5和草酸以1:1.2～1.4的摩尔比混合,可制得较纯的单斜晶系VO2超细粉末,颗粒呈近球形,平均晶粒度约为50 nm.低温为M相(单斜晶系,P21/c),升温时可转化为R相(正方晶系,P42/mnm),升温相变点为68.1℃,降温相变点为60.2℃,滞后7.9℃.具有良好的热致可逆循环相变稳定性,M/R相多次循环转换的DSC热滞回线呈现很好的重现性.
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Key words
vanadium dioxide,redox,thermal induced phase transition,XRD,STA,thermal hysteresis loop
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