Publications in Scientific Journals:

A. Grytsiv, P. Rogl, St Berger, C. Paul, E. Bauer, C. Godart, B. Ni, M.M. Abd-Elmeguid, A. Saccone, R. Ferro, D. Kaczorowski:
"Structure and physical properties of the thermoelectric skutterudites EuyFe4-xCoxSb12";
Physical Review B, 66 (2002), 094411-1 - 094411-0.

English abstract:
Structure and physical properties of the thermoelectric skutterudites EuyFe4?xCoxSb12

A. Grytsiv and P. Rogl Institut für Physikalische Chemie, Universität Wien, Währingerstrasse 42, A-1090 Wien, Austria

St. Berger, Ch. Paul, and E. Bauer Institut für Festkörperphysik, T.U. Wien, Wiedner Hauptstraße 8-10 A-1040 Wien, Austria

C. Godart CNRS-UPR209, ISCSA, 2-8 rue Henri Dunant, F94320 Thiais, France
LURE, CNRS, Université Paris Sud, 91405 Orsay, France

B. Ni and M. M. Abd-Elmeguid II. Physikalisches Institut, Universität Köln, Zülpicher Strasse 77, D-50937 Köln, Germany

A. Saccone and R. Ferro Dipartimento di Chimica e Chimica Industriale, Università di Genova, Sezione di Chimica Inorganica e Metallurgica, Via Dodecaneso 31, I-16146 Genova, Italy

D. Kaczorowski W. Trzebiatowski Institute for Low Temperature and Structure Research Polish Academy of Sciences, P-50-950 Wroclaw, P.O. Box 1410, Poland

(Received 26 October 2001; revised 21 February 2002; published 11 September 2002)

Compounds from the solid solution EuyFe4?xCoxSb12 were synthesized and found to crystallize in the partially filled skutterudite-type structure LaFe4P12. The maximal Eu content gradually decreases from practically full occupancy y = 0.83 in Eu0.83Fe4Sb12 to y = 0.44 for Eu0.44Co4Sb12. As a function of Fe/Co substitution in EuyFe4?xCoxSb12 the magnetic transition temperature decreases from 84 K for Eu0.83Fe4Sb12 to 8 K for Eu0.44Co4Sb12. At lower Eu content, Eu0.2Co4Sb12, long-range magnetic order disappears. Concomitantly, the Eu valence changes from almost divalent Eu in Eu0.83Fe4Sb12 to [nu] [[approximate]] 2.6 for Eu0.2Co4Sb12. The transition metal exchange Fe/Co reduces the number of free carriers and causes a crossover of the electronic transport from a hole conductivity regime into electron dominated behavior. Thermoelectric properties change accordingly. 2002 The American Physical Society

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