Work

Enhanced thermoelectric performance of optimized Yb-filled and Fe-substituted skutterudite compounds Yb 0.6 Fe x Co 4− x Sb 12

Year: 2016

Type: article

Abstract: Optimized Yb-filled Fe-substituted skutterudites Yb 0.6 Fe x Co 4− x Sb 12 ( 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 CoSb 3 -based skutterudites.

Source: Japanese Journal of Applied Physics

DOI: 10.7567/jjap.55.04ej02

Authors: Yuqi Chen, Yukihiro Kawamura, Junichi Hayashi, Chihiro Sekine

Institution: Muroran Institute of Technology

Language: English

Topic: Advanced Thermoelectric Materials and Devices

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: bronze

Funder: Japan Society for the Promotion of Science