Enhanced thermoelectric figure of merit in stannite-kuramite solid solutions Cu2+xFe1-xSnS4-y (x = 0-1) with anisotropy lowering

Yosuke Goto, Fumihiko Naito, Rina Sato, Keigo Yoshiyasu, Takanori Itoh, Yoichi Kamihara, Masanori Matoba

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

In this Article, we elucidate the structural and thermoelectric properties of stannite-kuramite solid solutions, Cu2+xFe1-xSnS 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.

Original languageEnglish
Pages (from-to)9861-9866
Number of pages6
JournalInorganic Chemistry
Volume52
Issue number17
DOIs
Publication statusPublished - 2013 Sep 2

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figure of merit
Solid solutions
Anisotropy
solid solutions
anisotropy
Seebeck coefficient
Seebeck effect
Sulfur
structural analysis
Structural analysis
Silicon Dioxide
Thermal conductivity
chemical composition
sulfur
thermal conductivity
disorders
silicon dioxide
conduction
Defects
optimization

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Physical and Theoretical Chemistry

Cite this

Enhanced thermoelectric figure of merit in stannite-kuramite solid solutions Cu2+xFe1-xSnS4-y (x = 0-1) with anisotropy lowering. / Goto, Yosuke; Naito, Fumihiko; Sato, Rina; Yoshiyasu, Keigo; Itoh, Takanori; Kamihara, Yoichi; Matoba, Masanori.

In: Inorganic Chemistry, Vol. 52, No. 17, 02.09.2013, p. 9861-9866.

Research output: Contribution to journalArticle

Goto, Yosuke ; Naito, Fumihiko ; Sato, Rina ; Yoshiyasu, Keigo ; Itoh, Takanori ; Kamihara, Yoichi ; Matoba, Masanori. / Enhanced thermoelectric figure of merit in stannite-kuramite solid solutions Cu2+xFe1-xSnS4-y (x = 0-1) with anisotropy lowering. In: Inorganic Chemistry. 2013 ; Vol. 52, No. 17. pp. 9861-9866.
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AU - Sato, Rina

AU - Yoshiyasu, Keigo

AU - Itoh, Takanori

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AU - Matoba, Masanori

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