Journal
INORGANIC CHEMISTRY
Volume 52, Issue 17, Pages 9861-9866Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ic401310c
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Funding
- Keio University
- Keio Leading-edge Laboratory of Science and Technology (KLL)
- Funding Program for World-Leading Innovative R&D on Science and Technology (FIRST) from the Japan Society for Promotion of Science (JSPS)
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In this Article, we elucidate the structural and thermoelectric properties of stannite-kuramite solid solutions, Cu2+xFe1-xSnS4-y), (x = 0-1), with sulfur defects (y) <= 0.4. Structural analysis revealed that anisotropy decreases and Cu/Sn disorder increases with an increase in x. The samples with x = 0.8-1 exhibit degenerate conduction, whereas the Seebeck coefficient (S) remains relatively high, S approximate to 100 mu V K-1 for x = 0.8 at 300 K. Thermal conductivities (K) of the solid solutions are in the range 10(-3)-10(-2) W cm(-1) K-1, which is close to the K value of silicon dioxide. The dimensionless figure of merit (ZT) reaches 0.044 for x = 0.8 at 300 K. The ZT is enhanced significantly by that of x = 0 at 300 K. These findings allow us to attain higher ZT values an increase in temperature and is doubly larger than that x=0 at 300 K. These findings allow us to attain higher ZT values through optimization of chemical composition.
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