VO2是一种温感相变材料,68℃左右它从低温半导体相向高温金属相转变,同时其光学和电学性质发生突变.由于V与O之间可以形成任意化学配比的VxOy,,所以纯VO2的制备过程复杂难以控制.采用单一原料NH4VO3,在化学计量反应计算的基础上将其装入刚玉坩埚,置于特制的高压釜中,升温至1000K,反应60min,自然冷却得蓝黑色VO2样品.利用X射线衍射、扫描电镜和差示扫描量热法对样品进行表征与测试.结果表明,所制备的样品为VO2多晶粉末.粒度为几至几十微米,具有相变特性.相变温度为343.53K,相变过程是吸热过程,相变焓为43.75J/g.目前,该方法是合成VO2研究中最简单易行的方法.
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