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Structure and Thermoelectric Properties of New Quaternary Tin and Lead Bismuth Selenides, K1+xM4-2xBi7+xSe15 (M = Sn, Pb) and K1+xSn5-xBi11+xSe22

Published online by Cambridge University Press:  01 February 2011

Antje Mrotzek ,
Kyoung-Shin Choi ,
Duck-Young Chung ,
Melissa A. Lane ,
John R. Ireland ,
Paul W. Brazis ,
Tim Hogan ,
Carl R. Kannewurf  and
Mercouri G. Kanatzidis
Antje Mrotzek
Affiliation:
Department of Chemistry, Michigan State University, East Lansing, MI 48824.
Kyoung-Shin Choi
Affiliation:
Department of Chemistry, Michigan State University, East Lansing, MI 48824.
Duck-Young Chung
Affiliation:
Department of Chemistry, Michigan State University, East Lansing, MI 48824.
Melissa A. Lane
Affiliation:
Department of Electrical Engineering and Computer Science, Northwestern University, Evanston, IL.
John R. Ireland
Affiliation:
Department of Electrical Engineering and Computer Science, Northwestern University, Evanston, IL.
Paul W. Brazis
Affiliation:
Department of Electrical Engineering and Computer Science, Northwestern University, Evanston, IL.
Tim Hogan
Affiliation:
Department of Electrical Engineering, Michigan State University, East Lansing, MI 48824.
Carl R. Kannewurf
Affiliation:
Department of Electrical Engineering and Computer Science, Northwestern University, Evanston, IL.
Mercouri G. Kanatzidis
Affiliation:
Department of Chemistry, Michigan State University, East Lansing, MI 48824.
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Abstract

We present the structure and thermoelectric properties of the new quaternary selenides K1+xM4–2xBi7+xSe15 (M = Sn, Pb) and K1-xSn5-xBi11+xSe22. The compounds K1+xM4-2xBi7+xSe15 (M= Sn, Pb) crystallize isostructural to A1+xPb4-2xSb7+xSe15 with A = K, Rb, while K1-xSn5-xBi11+xSe22 reveals a new structure type. In both structure types fragments of the Bi2Te3-type and the NaCl-type are connected to a three-dimensional anionic framework with K+ ions filled tunnels. The two structures vary by the size of the NaCl-type rods and are closely related to β-K2Bi8Se13 and K2.5Bi8.5Se14. The thermoelectric properties of K1+xM4-2xBi7+xSe15 (M = Sn, Pb) and K1-xSn5-xBi11+xSe22 were explored on single crystal and ingot samples. These compounds are narrow gap semiconductors and show n-type behavior with moderate Seebeck coefficients. They have very low thermal conductivity due to an extensive disorder of the metal atoms and possible “rattling” K+ ions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 626: Symposium Z – Thermoelectric Materials 2000 - The Next Generation Materials for Small-Scale Refrigeration and Power Generation Applications , 2000 , Z8.4
Copyright
Copyright © Materials Research Society 2000

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References

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