Thermoelectric properties of the Ru{sub 2}Ni{sub 2}Sb{sub 12} ternary skutterudite

Journal Article · Sat Sep 15 04:00:00 EDT 2012 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/J.JSSC.2012.03.028· OSTI ID:22149791

Navratil, Jiri ^[1]; Laufek, Frantisek; Plechacek, Tomas; Drasar, Cestmir ^[2]

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1. Institute of Macromolecular Chemistry of the Academy of Sciences of the Czech Republic v.v.i., Heyrovsky sq. 2, 12006 Prague (Czech Republic)
2. Faculty of Chemical Technology, University of Pardubice, 53210 Pardubice (Czech Republic)

The synthesis of the Ru{sub 2-x}Ni{sub 2-x}Sb{sub 12} compounds (0{<=}x{<=}0.2), their structural characterization and temperature dependencies of selected transport and thermal properties are reported. At x=0, Ru{sub 2-x}Ni{sub 2-x}Sb{sub 12} displays cubic symmetry, space group Im3{sup Macron} with lattice parameter a=9.1767(1) A. From increasing electrical conductivity above 600 K the band gap (E{sub g}{approx}0.06 eV) was estimated using an Arrhenius plot. Different signs of the Seebeck coefficient (negative) and the Hall coefficient (positive) have been explained as a consequence of a multicarrier transport. The substitution on a cation site, i.e., formation of the Ru{sub 2-x}Ni{sub 2-x}Sb{sub 12} ternary skutterudites proved to be effective way in suppressing of the thermal conductivity. - Graphical abstract: Polyhedral representation of the Ru{sub 2}Ni{sub 2}Sb{sub 12} skutterudite crystal structure emphasizing the [(Ru/Ni)Sb{sub 6}] corner-sharing octahedra. Highlights: Black-Right-Pointing-Pointer Skutterudite-type structure with space group Im3{sup Macron} of the Ru{sub 2}Ni{sub 2}Sb{sub 12} was confirmed. Black-Right-Pointing-Pointer The band gap of the studied compounds was estimated - E{sub g}{approx}0.06 eV. Black-Right-Pointing-Pointer Low lattice thermal conductivity of the Ru{sub 2}Ni{sub 2}Sb{sub 12} was observed.

• OSTI ID: 22149791
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Vol. 193; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
CHEMICAL PREPARATION
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
LATTICE PARAMETERS
SPACE GROUPS
THERMAL CONDUCTIVITY
THERMOELECTRIC PROPERTIES