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包含纳米CoSb3的Yb0.15Co4Sb12基复合材料的合成和热电性能

发表时间:2008-04-15  浏览量:1810  下载量:814
全部作者: 糜建立,赵新兵,朱铁军
作者单位: 浙江大学材料科学与工程系,硅材料国家重点实验室
摘 要: 在块体材料中引入纳米组元构建微纳复合材料是热电研究的一个新方向。本文合成了包含纳米CoSb3的Yb0.15Co4Sb12基复合材料,系统研究了不同含量的纳米CoSb3对Yb0.15Co4Sb12材料热电性能的影响。将溶剂热合成的CoSb3粉末和熔炼/退火方法合成的Yb0.15Co4Sb12粉末进行放电等离子体烧结,制备了包含纳米CoSb3晶粒的Yb0.15Co4Sb12基微纳复合材料。复合材料由小于100 nm的细小晶粒和微米级别的粗大晶粒组成。少量纳米晶粒的掺入能够提高材料的Seebeck系数。虽然掺入的纳米晶粒为未填充的CoSb3,但是它们的掺入仍然有效地降低了材料的热导率。微纳复合结构引入了大量晶界,增强了声子散射,从而降低了材料的热导率。复合材料的最高ZT值达到0.9,与基体材料Yb0.15Co4Sb12相比增加了10%。
关 键 词: 半导体物理学;热电性能;溶剂热合成;微纳复合;方钴矿
Title: Preparation and thermoelectric properties of Yb0.15Co4Sb12 based nanocomposites with CoSb3 nano-inclusion
Author: MI Jianli, ZHAO Xinbing, ZHU Tiejun
Organization: State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering
Abstract: Nanocomposites offer a promising approach to incorporate nanostructured constituents to bulk thermoelectric materials. Bulk skutterudite nanocomposites of Yb0.15Co4Sb12 with different contents of CoSb3 nano-inclusion were prepared by spark plasma sintering. The nanocrystals in the bulk composites are less than 100 nm. The Seebeck coefficient is enhanced by potential barrier scattering with incorporating a small amount of CoSb3 nanoparticles into the bulk materials, but depressed with further increasing content of the nanoparticle. Though the nano-inclusion is the unfilled CoSb3, it is effective in reducing thermal conductivity. The highest figure of merit reaches 0.9 for nanocomposites, about 10% increase compared with the Yb0.15Co4Sb12 matrix.
Key words: semiconductor physics; thermoelectric properties; solvothermal synthesis; nanocomposite; skutterudite
发表期数: 2008年8月第7期
引用格式: 糜建立,赵新兵,朱铁军. 包含纳米CoSb3的Yb0.15Co4Sb12基复合材料的合成和热电性能[J]. 中国科技论文在线精品论文,2008,1(7):724-728.
 
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