The thermoelectric properties of CeFe 4As 12 have been measured. The compound was synthesized by reacting a powder mixture of CeAs 2 and FeAs 2 with As metal. The sample was characterized by both x-ray diffractometry and electron microprobe analysis. The Seebeck coefficient, electrical resistivity, Hall effect, and the thermal conductivity were measured between room temperature and about 900 K. The results indicate that CeFe 4As 12 possesses semimetallic behavior similar to that of CeFe 4Sb 12 with a room temperature electrical resistivity of 0.49 mcm and a Seebeck coefficient of about 40 μV/K. The thermal conductivity of CeFe 4As 12 lies between that of CeFe 4P 12 and CeFe 4Sb 12 as may be expected from considerations of anionic mass and rattling effect of Ce atoms inside the skutterudite unit cell. A maximum thermoelectric figure of merit value of about 0.4 was obtained at 850 K for this compound.
ASJC Scopus subject areas
- Physics and Astronomy(all)