Enhanced thermoelectric properties of Zintl phase YbMg2Bi1.98 through Bi site substitution with Sb
Enhanced thermoelectric properties of Zintl phase YbMg2Bi1.98 through Bi site substitution with Sb
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通过用 Sb 取代 Bi 位来增强 Zintl 相 YbMg2Bi1.98 的热电性能
DOI：
10.1016/j.jmst.2020.04.052
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发表时间：
2020-12
影响因子：
10.9
通讯作者：
Sui Jiehe
中科院分区：
文献类型：
--
作者：
Wang Jing;Guo Muchun;Zhu Jianbo;Qin D;an;Guo Fengkai;Zhang Qian;Cai Wei;Sui Jiehe
Zintl相由于其独特的“声子-玻璃、电子-晶体”（PGEC）特性，被认为是一种很有前途的热电材料。对于具有CaAl 2Si 2型结构的AM 2X2化合物，YbMg 2Bi 2最近显示出具有竞争力的热电性能。然而，YbMg 2Bi 2化合物的优化主要集中在Yb或Mg位的取代上。在此，Bi位被取代的等电Sb和热电输运行为的影响进行了研究。部分替代降低了载流子浓度，并导致Bi和Sb原子半径和质量不同引起的晶格变形，进一步导致功率因数和热导率降低。幸运的是，导热系数的降低幅度优于功率因数。最后，Sb取代成功地导致了更好的热电性能相比，原始的YbMg 2Bi 1.98。特别是具有较高功率密度的YbMg 2Bi 1.88Sb 0.1，其能量转换效率在Th = 873 K和Tc = 300 K时达到最大值9.8%。这一工作表明，阴离子位上的取代的想法应该是一个新的策略，以获得更好的ZT值的AM 2X 2化合物。
Benefiting from the unique “Phonon-Glass, Electron-Crystal” (PGEC) characteristic, Zintl phases have been considered as a kind of promising thermoelectric materials. For the typicalAM2X2compounds with the CaAl2Si2-type structure, YbMg2Bi2has shown competitive thermoelectric performance recently. Nevertheless, the optimization of YbMg2Bi2compounds is primarily focused on the substitution on Yb or Mg site. Herein, the Bi site is substituted by isoelectric Sb and the effect on the thermoelectric transport behavior is investigated. The partial substitution reduces the carrier concentration and induces the lattice deformation caused by the different atomic radius and mass between Bi and Sb, further leading to the decreased power factor and thermal conductivity. Fortunately, the reduction extent of the thermal conductivity outperforms that of power factor. Finally, the Sb substitution successfully results in a better thermoelectric performance compared with that of the pristine YbMg2Bi1.98. Especially, the calculated energy conversion efficiency (η) of YbMg2Bi1.88Sb0.1which also possesses a relatively high output power density reaches the maximum value of 9.8 % whenTh= 873 K, andTc= 300 K, respectively. This work demonstrates that the idea of substitution on anionic site should be a new strategy to achieve betterZTvalues for AM2X2compounds.
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