Lead-Free Thermoelectrics: High Figure of Merit in p-type AgSnmSbTem+2
Lead-Free Thermoelectrics: High Figure of Merit in p-type AgSnmSbTem+2
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DOI：
10.1002/aenm.201100613
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发表时间：
2012-01-01
影响因子：
27.8
通讯作者：
Kanatzidis, Mercouri G.
中科院分区：
文献类型：
--
作者：
Han, Mi-Kyung;Androulakis, John;Kanatzidis, Mercouri G.
基于无铅组合物的热电材料在源自废热源的环境友好的发电应用中具有相当大的当前兴趣。本文对通式为AgSnmSbTem+2（m = 2，4，5，7，10，14，18）的锡基化合物的热电性能进行了新的研究，其中m值被用作热电性能的调节参数。从300 K至723 K测量电导率、塞贝克系数和热导率，并将所得热电优值确定为SnTe/AgSbTe 2比率的函数。当m = 4时，在710 K温度下，热电优值ZT接近1，表明AgSnmSbTem+2系统是一种很有前途的p型无铅热电材料。
Thermoelectric materials based on Pb-free compositions are of considerable current interest in environmentally friendly power-generation applications derived from waste-heat sources. Here, a new study of the thermoelectric properties of the tin-based compositions with the general formula AgSnmSbTem+2 (m = 2, 4, 5, 7, 10, 14, 18) is presented, where the m value is used as the tuning parameter of the thermoelectric properties. The electrical conductivity, Seebeck coefficient, and thermal conductivity are measured from 300 K to 723 K and the resulting thermoelectric figure of merit is determined as a function of the SnTe/AgSbTe2 ratio. A thermoelectric figure of merit ZT approximate to 1 is obtained at 710 K for m = 4, indicating that the system AgSnmSbTem+2 holds great promise as an alternative p-type, lead-free, thermoelectric material.