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SOME TRANSPORT PROPERTIES OF CoGe1.5Te1.5

J. Navrátil1,* , T. Plechácek1, L. Beneš1, M. Vlcek1

Affiliation

  1. Joint Laboratory of Solid State Chemistry of IMC AS CR and University of Pardubice, Studentská 84, 53210 Pardubice, Czech Republic

Abstract

N-type CoGe1.5Te1.5 compound was for the first time studied as a potential thermoelectric material. Due to the specific way of preparation, the samples of CoGe1.7Te1.47 composition with high overstoichiometry of Ge and some substoichiometry of Te were prepared. From x ray diffraction pattern it looks the compound is of cubic structure but some of lower symmetry (space groups _ No. 195 - P23, No. 200 - P2/m3 or No. 201- P2/n3) unlike the most of other skutterudite compounds (space group Im3). Tellurium vacancies or ionized surplus Ge atoms are proposed to be responsible for observed n-type conductivity. Two regions corresponding to extrinsic and intrinsic conductivity were identified on the temperature dependence of electrical conductivity. The potential possibility to change quantity of the incorporated Ge and Te in wide range around stoichiometric composition (CoGe1.5Te1.5) together with possibility to influence its thermoelectric properties by proper doping and void filling is therefore of interest of further thermoelectric research..

Keywords

Skutterudite, CoGe15Te1.5, Thermoelectric properties.

Submitted at: May 18, 2004
Accepted at: June 22, 2004

Citation

J. Navrátil, T. Plechácek, L. Beneš, M. Vlcek, SOME TRANSPORT PROPERTIES OF CoGe1.5Te1.5, Journal of Optoelectronics and Advanced Materials Vol. 6, Iss. 3, pp. 787-790 (2004)