In this Article, we elucidate the structural and thermoelectric properties of stannite-kuramite solid solutions, Cu(2+x)Fe(1-x)SnS(4-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 ≈ 100 μV K(-1) for x = 0.8 at 300 K. Thermal conductivities (κ) of the solid solutions are in the range 10(-3)-10(-2) W cm(-1) K(-1), which is close to the κ 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 an increase in temperature and is doubly larger than that of x = 0 at 300 K. These findings allow us to attain higher ZT values through optimization of chemical composition.
A series of polycrystalline samples of Cu2+xFe1-xSnS4-y (x = 0-1, y ≤ 0.4) are prepared by solid state reaction of stoichiometric mixtures of the elements (evacuated silica tubes, 750°C, 96 h). Structural analysis reveals that anisotropy decreases and Cu/Sn disorder increases with increasing x. Samples with x = 0.8-1 exhibit degenerate conductivity, whereas the Seebeck coefficient (S) remains relatively high, S ≈ 100μV/K for x = 0.8 at 300 K. Thermal conductivities of the solid solutions are in the range 10 -3 -10 -2 Wcm -1 K -1 , which is close to the κ value of silica. The dimensionless figure of merit (ZT) reaches 0.044 for x = 0.8 at 300 K. -(GOTO*, Y.; NAITO, F.; SATO, R.; YOSHIYASU, K.; ITOH, T.; KAMIHARA, Y.; MATOBA, M.; Inorg. Chem. 52 (2013) 17, 9861-9866, http://dx.doi.org/10.1021/ic401310c ; Dep. Appl. Phys. Physico-Inf., Keio Univ., Yokohama 223, Japan; Eng.) -J. Schramke 45-008
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