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Issue 8, 2018
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Structure transformation in Ca1−xδSrδLaxAg1−ySb (0 ≤ δ ≤ 0.7) and related thermoelectric properties

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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−xδSrδLaxAg1−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.

Graphical abstract: Structure transformation in Ca1−x−δSrδLaxAg1−ySb (0 ≤ δ ≤ 0.7) and related thermoelectric properties

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The article was received on 31 Mar 2018, accepted on 13 Jun 2018 and first published on 13 Jun 2018

Article type: Research Article
DOI: 10.1039/C8QI00293B
Citation: Inorg. Chem. Front., 2018,5, 1902-1911

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    Structure transformation in Ca1−xδSrδLaxAg1−ySb (0 ≤ δ ≤ 0.7) and related thermoelectric properties

    J. Guo, M. Zhu, X. Li, X. Tao and S. Xia, Inorg. Chem. Front., 2018, 5, 1902
    DOI: 10.1039/C8QI00293B

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