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Issue 24, 2016
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High thermoelectric performance of superionic argyrodite compound Ag8SnSe6

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A good thermoelectric material usually has a high power factor and low thermal conductivity for high figure of merit (ZT), and is also environmentally friendly and economical. Superionic compounds are heavily studied because of their ultra-low thermal conductivity even though the thermal stability remains an issue. In this work, we report a superionic argyrodite compound Ag8SnSe6 as a promising mid-temperature thermoelectric material because of its high ZT and good thermal stability up to 550 °C. It is revealed that Ag8SnSe6 exhibits a decent Seebeck coefficient (n-type) and electrical conductivity. At the same time, its thermal conductivity is lower than the glass limit with the thermal capacity CV below 3NkB at high temperature, where N is the Avogadro's number and kB the Boltzmann constant. Detailed microstructural and thermodynamic characterization of this compound is performed to understand the electronic and phononic origins of the thermoelectric properties. The highly random ionic occupations in the cubic phase, leading to the molten silver sublattice and phononic mode softening, are responsible for the very low thermal conductivity and ZT ∼ 1.1 at 450 °C.

Graphical abstract: High thermoelectric performance of superionic argyrodite compound Ag8SnSe6

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Publication details

The article was received on 25 Feb 2016, accepted on 16 May 2016 and first published on 17 May 2016

Article type: Paper
DOI: 10.1039/C6TC00810K
Citation: J. Mater. Chem. C, 2016,4, 5806-5813
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    High thermoelectric performance of superionic argyrodite compound Ag8SnSe6

    L. Li, Y. Liu, J. Dai, A. Hong, M. Zeng, Z. Yan, J. Xu, D. Zhang, D. Shan, S. Liu, Z. Ren and J. Liu, J. Mater. Chem. C, 2016, 4, 5806
    DOI: 10.1039/C6TC00810K

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