Enhanced thermoelectric performance of optimized Yb-filled and Fe-substituted skutterudite compounds Yb0.6FexCo4− xSb12 | Zendy

Yuqi Chen | Zendy; Yukihiro Kawamura | Zendy; Junichi Hayashi | Zendy; Chihiro Sekine | Zendy

Open Access

Enhanced thermoelectric performance of optimized Yb-filled and Fe-substituted skutterudite compounds Yb_0.6Fe_xCo₄₋ _xSb₁₂

Author(s) -

Yuqi Chen,

Yukihiro Kawamura,

Junichi Hayashi,

Chihiro Sekine

Publication year - 2016

Publication title -

japanese journal of applied physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.487

H-Index - 129

eISSN - 1347-4065

pISSN - 0021-4922

DOI - 10.7567/jjap.55.04ej02

Subject(s) - skutterudite , thermoelectric effect , seebeck coefficient , materials science , analytical chemistry (journal) , thermal conductivity , electrical resistivity and conductivity , thermoelectric materials , figure of merit , electron microprobe , atmospheric temperature range , chemistry , thermodynamics , metallurgy , optoelectronics , physics , chromatography , quantum mechanics , composite material

Optimized Yb-filled Fe-substituted skutterudites Yb0.6Fe x Co4? x Sb12 (x = 0, 0.5, and 1.0) were synthesized using a high-pressure technique. The samples were characterized by powder X-ray diffraction (XRD) analysis and electron probe microanalysis (EPMA). The thermoelectric transport properties of the samples such as Seebeck coefficient, electrical conductivity, carrier concentration, and thermal conductivity were studied in the temperature range of 2?300 K. With 1/8 Fe substitution for the Co site (x = 0.5), the Seebeck coefficient and thermal conductivity were obviously optimized. Carrier concentration analysis indicates that proper Fe substitution can effectively compensate for the excess electrons and optimize the electric transport properties. The reduction in the total thermal conductivity κ could be mainly caused by the reduction in electron contribution to κ. Compared with an only-Yb-filled compound, a 26% improved figure of merit ZT was achieved at 300 K at the Fe substitution ratio x = 0.5 (ZT = 0.11). This result confirms that Fe substitution on the Co site is an effective approach to tuning and optimizing the thermoelectric properties of CoSb3-based skutterudites

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