Preparation and thermoelectric properties of the skutterudite‐related phase Ru0.5Pd0.5Sb3

Autor:	Thierry Caillat, J. Kulleck, Alexander Borshchevsky, J.-P. Fleurial
Rok vydání:	1996
Předmět:	Thermal conductivity Materials science Condensed matter physics Band gap Electrical resistivity and conductivity Seebeck coefficient Thermoelectric effect engineering General Physics and Astronomy Skutterudite engineering.material Thermal analysis Thermoelectric materials
Zdroj:	Journal of Applied Physics. 79:8419-8426
ISSN:	1089-7550 0021-8979
DOI:	10.1063/1.362516
Popis:	A new skutterudite phase Ru(0.5)Pd(0.5)Sb3 was prepared. This new phase adds to a large number of already known materials with the skutterudite structure which have shown good potential for thermoelectric applications. Single phase, polycrystalline samples were prepared and characterized by x-ray analysis, electron probe microanalysis, density, sound velocity, thermal-expansion coefficient, and differential thermal analysis measurements. Ru(0.5)Pd(0.5)Sb3 has a cubic lattice, space group Im3 (T(sup 5, sub h)), with a = 9.298 A and decomposes at about 920 K. The Seebeck coefficient, the electrical resistivity, the Hall effect, and the thermal conductivity were measured on hot-pressed samples over a wide range of temperatures. Preliminary results show that Ru(0.5)Pd(0.5)Sb3 behaves as a heavily doped semiconductor with an estimated band gap of about 0.6 eV. The lattice thermal conductivity of Ru(0.5)Pd(0.5)Sb3 is substantially lower than that of the binary isostructural compounds CoSb3 and IrSb3. The unusually low thermal conductivity might be explained by additional hole and charge transfer phonon scattering in this material. The potential of this material for thermoelectric applications is discussed.
Databáze:	OpenAIRE
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