High thermoelectric properties of PbTe–Sm2Se3 composites
High thermoelectric properties of PbTe–Sm2Se3 composites
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DOI：
10.1016/j.scriptamat.2015.09.036
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发表时间：
2016-02
影响因子：
6
通讯作者：
Jun-qing Li;Z. Lu;S. M. Li;F. S. Liu;W. Ao;Y. Li
中科院分区：
文献类型：
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作者：
Jun-qing Li;Z. Lu;S. M. Li;F. S. Liu;W. Ao;Y. Li
合成了标称成分 (Pb0.96Na0.04Te)1 − x(Sm2Se3)x 且 x = 0、0.005、0.015、0.02、0.025、0.040 和 0.050 的复合材料，以研究其热电性能。在这些复合材料中，Sm2Se3 是第二相。通过用 Se 取代 Te，由于更多的 Na 溶解在 PbTe 基固溶体中，它增加了空穴载流子浓度，但降低了其载流子迁移率。 Sm2Se3 略微降低了功率因数，但显着降低了热导率。因此，适当的Sm2Se3含量可以提高品质因数ZT。 x = 0.025 的复合材料中达到的最高 ZT 为 1.5。
Composites of nominal composition (Pb0.96Na0.04Te)1 − x(Sm2Se3)xwith x = 0, 0.005, 0.015, 0.02, 0.025, 0.040 and 0.050 have been synthesized to study their thermoelectric properties. In these composites, Sm2Se3is the secondary phase. It increases the hole carrier concentration due to more Na dissolved in the PbTe-based solid solution by replacing Te with Se, but decreases its carrier mobility. The Sm2Se3reduces the power factor slightly, but reduces the thermal conductivity significantly. As a result, the figure of merit ZT can be enhanced with proper Sm2Se3content. The highest ZT achieved is 1.5 in the composite with x = 0.025.