Characterization of multiple-filled skutterudites with high thermoelectric performance
Characterization of multiple-filled skutterudites with high thermoelectric performance
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DOI：
10.1016/j.jallcom.2019.152272
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发表时间：
2020-01
影响因子：
6.2
通讯作者：
Shuye Zhang;Sunwu Xu;Hui Gao;Qingshuang Lu;Tiesong Lin;P. He;H. Geng
中科院分区：
文献类型：
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作者：
Shuye Zhang;Sunwu Xu;Hui Gao;Qingshuang Lu;Tiesong Lin;P. He;H. Geng
采用长期退火法和热压法制备了高性能的多元填充X-CoSb3Skutterudite(X- = ，Yb，Ca，Ba，Al，Ga，In，La，Eu)。与单一填充法相比，多元填充法可以提高CoSb3的热电性能。填充多种原子的方锌矿的晶格常数增加到9.076 ä，高于未填充的9.036 ä。在300~823K温度范围内，分析了材料的电导率、热导率和塞贝克系数。Yb的填充分数随富铁相和贫铁相中Fe含量的增加而增加。对于Ca原子，富Fe相和贫铁相发生了明显的相分离，且贫Fe相中的Ca填充分数较高。随着Fe含量的增加，贫铁相中Al原子逐渐增多，富Fe相中Al原子逐渐减少。相反，在统计分析中，填充的Ga和In原子没有明显的规律性。与文献中的Yb0.5Co4Sb12样品相比，多填充有效地降低了晶格热导率，多填充的Skutterudite使晶格热导率降低了47%，在823K时ZT达到最大值1.22 。
High performance multiple-filled X–CoSb3skutterudites (X = Yb,Ca,Ba,Al,Ga,In,La,Eu) was prepared by the long term annealing and hot-pressing approaches. Compared with the one-element filling method, multi-elements filling in CoSb3can improve their thermoelectric values. The lattice constant of skutterudite filled with multiple types of atoms was increased to 9.076 Å, higher than 9.036 Å of the un-filled one. The electrical conductivity, thermal conductivity and Seebeck coefficient were analyzed from 300K to 823K. The filling fraction of Yb increase with the increasing Fe content in both the Fe-rich phase and the Fe-poor phase. For Ca atoms, a significant phase separation occurs in the Fe-rich phase and the Fe-poor phase, and the Ca filling fraction in the Fe-poor phase is much higher. With the increase of Fe contents, the Al atoms gradually increase in the Fe-poor phase and decrease in the Fe-rich phase. On the contrary, the filled Ga and In atoms have no obvious regularity in this statistical analysis. Compared with the referred Yb0.5Co4Sb12sample, the lattice thermal conductivity is effectively reduced by multi-filling, the multi-filled skutterudite obtained the 47% reduce of the lattice thermal conductivity and the maximumZTvalue was reached 1.22 at 823K.