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Structure Transformation in Ca1-x-δSrδLaxAg1-ySb (0 ≤ δ ≤ 0.7) and Related Thermoelectric Properties

Abstract

As novel Zintl phases with the LiGaGe structure type, Ca1−xCexAg1−ySb has shown decent thermoelectric performance as well as complex structure transitions, which is closely related to the Ag defects in the anioic layers. In this report, La/Sr co-doped materials, Ca1-x-δSrδLaxAg1-ySb (0≤x≤0.7), were prepared and studied on 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 on the thermoelectric performance resulted. For material 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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Publication details

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, Accepted Manuscript
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    Structure Transformation in Ca1-x-δSrδLaxAg1-ySb (0 ≤ δ ≤ 0.7) and Related Thermoelectric Properties

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

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