标题：Structure transformation in Ca1-x-δSrδLaxAg1-ySb (0 ≤ δ ≤ 0.7) and related thermoelectric properties
作者：Guo, Jia ;Zhu, Min ;Li, Xin ;Tao, Xu-Tang ;Xia, Sheng-Qing
作者机构：[Guo, Jia ;Zhu, Min ;Li, Xin ;Tao, Xu-Tang ;Xia, Sheng-Qing ] State Key Laboratory of Crystal Materials, Institute of Crystal Materials, Shandong Univ 更多
来源：Inorganic Chemistry Frontiers
摘要：As novel Zintl phases with the LiGaGe structure type, Ca1-xCexAg1-ySb has shown decent thermoelectric performance as well as complex structure transitions, which are closely related to the Ag defects in the anionic layers. In this report, La/Sr co-doped materials, Ca1-x-δSrδLaxAg1-ySb (0 ≤ δ ≤ 0.7), were prepared and studied regarding relevant thermoelectric properties. Interestingly, the incorporation of alkaline-earth metal Sr suggested a different structure transition mechanism from the LiGaGe type to the ZrBeSi-type, which seemed closely related to the Sr doping concentrations. Besides, significant enhancement of the thermoelectric performance resulted. For materials with a specific composition of Ca0.55Sr0.3La0.15Ag0.89Sb, a maximum zT of 0.7 has been achieved at 823 K, which also corresponded to a high average zT value of 0.66 between 774 and 1068 K.
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