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- W2995492085 abstract "Substitution of tin by indium in shandite-type phases, A3Sn2S2 with mixed Co/Fe occupancy of the A-sites is used to tune the Fermi level within a region of the density of states in which there are sharp, narrow bands of predominantly metal d-character. Materials of general formula Co2.5+x Fe0.5-x Sn2--yIn y S2 (x = 0, 0.167; 0.0 ≤ y ≤ 0.7) have been prepared by solid-state reaction and the products characterized by powder X-ray diffraction. Electrical-transport property data reveal that the progressive depopulation of the upper conduction band as tin is replaced by indium increases the electrical resistivity, and the weakly temperature-dependent ρ(T) becomes more semiconducting in character. Concomitant changes in the negative Seebeck coefficient, the temperature dependence of which becomes increasingly linear, suggests the more highly substituted materials are n-type degenerate semiconductors. The power factors of the substituted phases, while increased, exhibit a weak temperature dependence. The observed reductions in thermal conductivity are principally due to reductions in the charge-carrier contribution on hole doping. A maximum figure-of-merit of (ZT)max = 0.29 is obtained for the composition Co2.667Fe0.333Sn1.6In0.4S2 at 573 K: among the highest values for an n-type sulfide at this temperature." @default.
- W2995492085 created "2019-12-26" @default.
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- W2995492085 date "2019-12-17" @default.
- W2995492085 modified "2023-10-10" @default.
- W2995492085 title "Improved Thermoelectric Performance through Double Substitution in Shandite-Type Mixed-Metal Sulfides" @default.
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- W2995492085 doi "https://doi.org/10.1021/acsaem.9b02272" @default.
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