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A Dual Role by Incorporation of Magnesium in YbZn2Sb2 Zintl Phase for Enhanced Thermoelectric Performance
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2020-06-24 , DOI: 10.1002/aenm.202001229 Zongwei Zhang 1 , Yirui Yan 1 , Xiaofang Li 1 , Xinyu Wang 1 , Juan Li 1 , Chen Chen 1 , Feng Cao 2 , Jiehe Sui 3 , Xi Lin 1 , Xingjun Liu 1, 3 , Guoqiang Xie 1 , Qian Zhang 1, 3
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2020-06-24 , DOI: 10.1002/aenm.202001229 Zongwei Zhang 1 , Yirui Yan 1 , Xiaofang Li 1 , Xinyu Wang 1 , Juan Li 1 , Chen Chen 1 , Feng Cao 2 , Jiehe Sui 3 , Xi Lin 1 , Xingjun Liu 1, 3 , Guoqiang Xie 1 , Qian Zhang 1, 3
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1‐2‐2‐type Zintl phase compounds have promising thermoelectric properties because of their complex crystal structures and multiple valence‐band structures. In this work, a series of single phase (Yb0.9Mg0.1)Mgx Zn2−x Sb2 (x = 0, 0.2, 0.4, 0.6, 0.8, and 1) compounds are prepared by alloying YbZn2Sb2 with 10 at% MgZn2Sb2 and different amounts of YbMg2Sb2. The incorporation of Mg at the Yb site, as well as at the Zn site, not only leads to an effective orbital alignment confirmed by the dramatically enhanced density of states effective mass and Seebeck coefficients, but also increases the point defect scattering, contributing to a low lattice thermal conductivity ≈0.54 W m−1 K−1 at 773 K. Combined with the optimization of the carrier concentration by Ag doping at the Zn site, a highest ZT value ≈1.5 at 773 K is achieved in (Yb0.9Mg0.1)Mg0.8Zn1.2Ag0.002Sb2, which is higher than that of all the previously reported 1‐2‐2‐type Zintl phase compounds.
中文翻译：
通过在YbZn2Sb2 Zintl相中掺入镁来增强热电性能的双重作用
1-2-2型Zintl相化合物因其复杂的晶体结构和多个价带结构而具有良好的热电特性。在这项工作中，通过将YbZn 2 Sb 2与10合金化，制备了一系列单相（Yb 0.9 Mg 0.1）Mg x Zn 2- x Sb 2（x = 0、0.2、0.4、0.6、0.8和1）化合物原子百分比的MgZn 2 Sb 2和不同量的YbMg 2 Sb 2。在Yb位置和Zn位置掺入Mg不仅会导致有效的轨道对准，这可以通过有效密度的有效密度和塞贝克系数的显着提高而得到确认，而且还会增加点缺陷的散射，从而导致低的晶格热导率≈0.54脉冲W M -1 ķ -1在773 K.结合载流子浓度的最佳化的Ag掺杂的锌位点，最高ZT值≈1.5在773 K的（镱达到0.9镁0.1）Mg 0.8 Zn 1.2 Ag 0.002 Sb 2，高于以前报道的所有1-2-2型Zintl相化合物的Mg 0.8 Zn 1.2 Ag 0.002 Sb 2。
更新日期：2020-08-04
中文翻译：
通过在YbZn2Sb2 Zintl相中掺入镁来增强热电性能的双重作用
1-2-2型Zintl相化合物因其复杂的晶体结构和多个价带结构而具有良好的热电特性。在这项工作中，通过将YbZn 2 Sb 2与10合金化，制备了一系列单相（Yb 0.9 Mg 0.1）Mg x Zn 2- x Sb 2（x = 0、0.2、0.4、0.6、0.8和1）化合物原子百分比的MgZn 2 Sb 2和不同量的YbMg 2 Sb 2。在Yb位置和Zn位置掺入Mg不仅会导致有效的轨道对准，这可以通过有效密度的有效密度和塞贝克系数的显着提高而得到确认，而且还会增加点缺陷的散射，从而导致低的晶格热导率≈0.54脉冲W M -1 ķ -1在773 K.结合载流子浓度的最佳化的Ag掺杂的锌位点，最高ZT值≈1.5在773 K的（镱达到0.9镁0.1）Mg 0.8 Zn 1.2 Ag 0.002 Sb 2，高于以前报道的所有1-2-2型Zintl相化合物的Mg 0.8 Zn 1.2 Ag 0.002 Sb 2。
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