放电等离子烧结
材料科学
热电效应
球磨机
复合数
热导率
透射电子显微镜
热电材料
热电发电机
烧结
复合材料
纳米技术
热力学
物理
作者
Dan Feng,Huajun Chen,Liangwei Fu,Ju Li,Jiaqing He
出处
期刊:Rare Metals
[Springer Nature]
日期:2017-12-28
卷期号:37 (4): 333-342
被引量:30
标识
DOI:10.1007/s12598-017-0994-6
摘要
Earth-abundant IV–VI semiconductor SnSe is regarded as a promising thermoelectric material due to its intrinsic low thermal conductivity. In this report, the highly textured SnSe/Ag2Se composites were first designed by solid solution method followed by spark plasma sintering (SPS) and their thermoelectric properties in two directions were investigated, and then, the performance of composites was further optimized with an additional ball milling. The coexistence of SnSe and Ag2Se phases is clearly confirmed by energy-dispersive X-ray spectroscopy (EDX) in transmission electron microscopy (TEM). After ball milling, the size of SnSe grains as well as the incorporated Ag2Se particles reduces effectively, which synergistically optimizes the electrical and thermal transport properties at high temperature range. As a result, a maximum ZT of ~ 0.74 at 773 K for SnSe + 1.0%Ag2Se in the direction vertical to the pressing direction is achieved. Composite engineering with additional ball milling is thus proved to be an efficient way to improve the thermoelectric properties of SnSe, and this strategy could be applicable to other thermoelectric systems.
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