掺钨二氧化钒相变的热分析动力学研究

来源 :中国化学会第五届全国热分析动力学与热动力学学术会议 | 被引量 : 0次 | 上传用户:wwwdslyj
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  VO2 在临界温度Tc 68℃发生可逆相变,由低温绝缘体相向高温金属相转变.在相变过程中,红外波段的光学性质发生了巨大的突变,低于Tc 时,处于绝缘体状态,在V 原子对间存在0.6ev 的带隙,允许较高的红外光透过率;而高于Tc 时,处于金属状态,费米能级和V3d 能带的重叠消除了上述的带隙,使得在红外波段拥有较高的反射及较低的透过率.
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