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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 ,
Peter Rogl ,
Stefan Berger ,
Christoph Paul ,
Ernst Bauer ,
Claude Godart ,
Adriana Saccone ,
Ricardo Ferro  and
Darek Kaczorowski
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
Information
MRS Online Proceedings Library (OPL) , Volume 691: Symposium G – Thermoelectric Materials 2001--Research and Applications , 2001 , G8.36
Copyright
Copyright © Materials Research Society 2002

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References

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