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Formation, Crystal Structure and Physical Properties of Novel Thermoelectric Skutterudites: EuyFe4−xNixSb12

Published online by Cambridge University Press:  21 March 2011

Andriy Grytsiv
Affiliation:
Institut für Physikalische Chemie, Universität Wien, Währingerstr. 42, A-1090 Wien, Austria
Peter Rogl
Affiliation:
Institut für Physikalische Chemie, Universität Wien, Währingerstr. 42, A-1090 Wien, Austria
Stefan Berger
Affiliation:
Institut für Experimentalphysik, T.U. Wien, Wiedner Hauptstr. 8-10 A-1040 Wien, Austria
Christoph Paul
Affiliation:
Institut für Experimentalphysik, T.U. Wien, Wiedner Hauptstr. 8-10 A-1040 Wien, Austria
Ernst Bauer
Affiliation:
Institut für Experimentalphysik, T.U. Wien, Wiedner Hauptstr. 8-10 A-1040 Wien, Austria
Claude Godart
Affiliation:
CNRS-UPR209, 2-8 rue Henri Dunant, F94320 Thiais, and LURE, CNRS, 91405 Orsay, France
Adriana Saccone
Affiliation:
Dip. Chimica e Chimica Industriale, Univ. Genova, Via Dodecaneso 31, I-16146 Genova, Italy
Ricardo Ferro
Affiliation:
Dip. Chimica e Chimica Industriale, Univ. Genova, Via Dodecaneso 31, I-16146 Genova, Italy
Darek Kaczorowski
Affiliation:
W. Trzebiatowski Institute for Low Temperature and Structure Research Polish Academy of Sciences, P-50-950 Wroclaw, P. O. Box 1410, Poland
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Abstract

Quantitative X-ray powder Rietveld refinements for a series of alloys from the solid solution EuyFe4−xNixSb12, synthesized by argon arc-melting followed by long term annealing, established in all cases isotypism with the partially filled skutterudite-type structure, LaFe4P12. The Eucontent of the samples was determined from the combined data obtained results of Rietveld refinements and electron microprobe measurements. These investigations confirmed a systematic trend for the Eu-occupancy y in the parent lattice, revealing a gradual decrease of the maximum Eu-content from practically full occupancy, y = 0.83, in Eu0.83Fe4Sb12 to y ∼ 0.5 for Eu∼0.5Fe2Ni2Sb12. Eu0.83Fe4Sb12 orders magnetically below 84 K and the transition temperature decreases as a function of Fe/Ni substitution. As a further consequence of the Fe/Ni substitution electronic transport crosses over from a hole conductivity regime into electron dominated behaviour. Concomitantly, the transition metal exchange increases the Seebeck coefficient significantly, hence the figure of merit enhances.

Type
Research Article
Copyright
Copyright © Materials Research Society 2002

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Formation, Crystal Structure and Physical Properties of Novel Thermoelectric Skutterudites: EuyFe4−xNixSb12
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