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Materials chemistry and physics v.211, 2018년, pp.321 - 328  

Synthesis and transport properties of p-type lead-free AgSn m SbSe2Te m thermoelectric systems

Figueroa-Millon, Sebastián (Departamento de Química, Facultad de Ciencias, Universidad de Chile, Santiago, Chile ) ; Álvarez-Serrano, Inmaculada (Departamento de Química Inorgánica I, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040, Madrid, Spain ) ; Bérardan, David (SP2M – ) ; Galdámez, Antonio (ICMMO (UMR CNRS 8182), Univ. Paris-Sud, Univ. Paris-Saclay, F-91405, Orsay, France ) ;
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    Abstract We report the synthesis, characterization and thermoelectric properties of lead-free AgSn m SbSe 2 Te m ( m = 2 and 10) systems. Powder X-ray diffraction patterns and Rietveld refinement results were consistent with phases belonging to the P m 3 ¯ m space group. The microstructures and morphologies of these systems were investigated using scanning electron microcopy (SEM) and high-resolution transmission electron microscopy (HRTEM). Parallelepiped bars for transport measurements were prepared using two methods: the classical method (CM) from melted samples and the spark plasma sintering (SPS). The AgSn m SbSe 2 Te m ( m = 2 and 10) systems exhibited typical degenerate semiconductor behavior, with a carrier concentration of approximately +10 21 cm −3 . We determined that the Seebeck coefficient can be substantially increased from approximately +40 μV K −1 (CM) to +70 μV K −1 (SPS) in AgSn 2 SbSe 2 Te 2 at room temperature. Consequently, the power factor ( S 2 σ ) was ∼22 μW cm −1 K −2 . On the basis of the electrical and thermal transport properties, ZT values of ∼0.10 were obtained at room temperature. Highlights p -type AgSn m SbSe 2 Te m systems exhibit typical degenerate semiconductor behavior. The maximum S 2 σ value of 22 μW cm −1 K −2 was obtained for AgSn 2 SbSe 2 Te 2 SPSed-sample. ZT values of ∼0.10 were obtained at room temperature. κ latt of AgSn m SbSe 2 Te m systems was ∼0.6 W m −1 K −1 . Graphical abstract [DISPLAY OMISSION]


  • 주제어

    Thermoelectric materials .   Chemical synthesis .   Transmission electron microscopy HRTEM .   X-ray diffraction.  

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