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OALib Journal期刊
ISSN: 2333-9721
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高压合成纳米晶bi0.85sb0.15的低温热电性
Abstract:
？通过机械合金化法获得bi0.85sb0.15纳米晶粉末材料,在常温下冷压成型并分别在不同温度下进行高压处理,制备出块状样品.x-ray衍射实验证实已形成了bi0.85sb0.15单相合金.测量了样品在80～300k温区的seebeck系数和电导率,计算出材料的功率因子与温度的关系.在523k6gpa下压制30min的样品,其seebeck系数在150k达到-173μv/k,比同温度下单晶材料样品的seebeck高大约60%,功率因子在200k达到3.27×10-3w/m·k2,表明高压处理可以有效改善材料热电性能.高分辨电镜分析发现材料中存在均匀分布的小于5nm的"纳米点","纳米点"的存在导致材料seebeck系数在低温显著提高.
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