Enhanced Thermoelectric Figure of Merit in Stannite鈥揔uramite Solid Solutions Cu2+xFe1鈥?i>xSnS4鈥?i>y (x = 0鈥?) with Anisotropy Lowering
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- 作者：Yosuke Goto ; Fumihiko Naito ; Rina Sato ; Keigo Yoshiyasu ; Takanori Itoh ; Yoichi Kamihara ; Masanori Matoba
- 刊名：Inorganic Chemistry
- 出版年：2013
- 出版时间：September 3, 2013
- 年：2013
- 卷：52
- 期：17
- 页码：9861-9866
- 全文大小：342K
- 年卷期：v.52,no.17(September 3, 2013)
- ISSN：1520-510X
文摘
In this Article, we elucidate the structural and thermoelectric properties of stannite鈥搆uramite solid solutions, Cu2+xFe1鈥?i>xSnS4鈥?i>y (x = 0鈥?), with sulfur defects (y) 鈮?0.4. Structural analysis revealed that anisotropy decreases and Cu/Sn disorder increases with an increase in x. The samples with x = 0.8鈥? exhibit degenerate conduction, whereas the Seebeck coefficient (S) remains relatively high, S 鈮?100 渭V K鈥? for x = 0.8 at 300 K. Thermal conductivities (魏) of the solid solutions are in the range 10鈥?鈥?0鈥? W cm鈥? K鈥?, which is close to the 魏 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.