Thermoelectric Properties of SnzCo4Sb12-yTey Skutterudites

Author

Mallik, Ramesh Chandra ; Jung, Jae-Yong ; Das, V. Damodara ; Ur, Soon-Chul ; Kim, Il-Ho

Author_Institution

Res. Center for Sustainable ECo-Devices & Mater., Chungju Nat. Univ., Chungbuk

fYear

2006

fDate

6-10 Aug. 2006

Firstpage

431

Lastpage

434

Abstract

Sn-filled and Te-doped CoSb₃ skutterudites (Sn_zCo₄Sb_12-yTe_y) were synthesized by encapsulated induction melting, and their thermoelectric properties were investigated from 300 K to 700 K. Single delta-phase was successfully obtained by the subsequent heat treatment at 823 K for 6 days. Intrinsic CoSb₃ showed n-type conductivity from 300 K to 400 K and there is a transition to p-type conductivity above 400 K. Sn-filled Sn _zCo₄Sb₁₂ showed p-type conductivity and Sn-filled/Te-doped Sn_zCo₄Sb_12-yTe_y showed n-type conductivity from 300 K to 700 K, indicating that Te atoms substituting for Sb atoms acted as electron donors. Thermal conductivity was considerably reduced by filling and doping due to the phonon scattering. Sn filling effect and Te doping effect are examined and compared in this study

Keywords

cobalt compounds; electrical conductivity; heat treatment; melting; thermal conductivity; thermoelectricity; tin compounds; 300 to 700 K; SnCo₄Sb₁₂Te; doping; electrical conductivity; encapsulated induction melting; filling; heat treatment; phonon scattering; skutterudites; thermal conductivity; thermoelectricity; Doping; Electrons; Filling; Heat treatment; Phonons; Scattering; Tellurium; Thermal conductivity; Thermoelectricity; Tin;

fLanguage

English

Publisher

ieee

Conference_Titel

Thermoelectrics, 2006. ICT '06. 25th International Conference on

Conference_Location

Vienna

ISSN

1094-2734

Print_ISBN

1-4244-0811-3

Electronic_ISBN

1094-2734

Type

conf

DOI

10.1109/ICT.2006.331307

Filename

4133322