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Synthesis, Crystal Structure and Thermoelectric Properties of β-K2Bi8Se13 Solid Solutions

Published online by Cambridge University Press:  01 February 2011

Theodora Kyratsi
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
Jeff S. Dyck
Affiliation:
Department of Physics, University of Michigan, Ann Arbor, MI 48109
Ctirad Uher
Affiliation:
Department of Physics, University of Michigan, Ann Arbor, MI 48109
Sangeeta Lal
Affiliation:
Department of Electrical and Computer Engineering, Michigan State University, East Lansing, MI 48824
Sim Loo
Affiliation:
Department of Electrical and Computer Engineering, Michigan State University, East Lansing, MI 48824
Tim Hogan
Affiliation:
Department of Electrical and Computer Engineering, Michigan State University, East Lansing, MI 48824
John Ireland
Affiliation:
Department of Electrical and Computer Engineering, Northwestern University, Evanston, IL 60208
Carl R. Kannewurf
Affiliation:
Department of Electrical and Computer Engineering, Northwestern University, Evanston, IL 60208
Evripides Hatzikraniotis
Affiliation:
Department of Physics, Aristotle University of Thessaloniki, 54006 Thessaloniki, Greece
Konstantinos M. Paraskevopoulos
Affiliation:
Department of Physics, Aristotle University of Thessaloniki, 54006 Thessaloniki, Greece
Mercouri G. Kanatzidis
Affiliation:
Department of Chemistry, Michigan State University, East Lansing, MI 48824
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Abstract

Solid solution series of the type K2Bi8-xSb x Se13, K2-xRb x Bi8Se13 as well as K2Bi8Se13-xS x were prepared and the distribution of the atoms (Bi/Sb, K/Rb and Se/S) on different crystallographic sites, the band gaps and their thermoelectric properties were studied. The distribution Se/S appears to be more uniform than the distribution of the Sb and Rb atoms in the β-K2Bi8Se13 structure that shows preference in specific sites in the lattice. Band gap is mainly affected by Sb and S substitution. Seebeck coefficient measurements showed n-type character for of all Se/S members. In the Bi/Sb series an enhancement of p-type character was observed. The thermoelectric performance as well as preliminary high temperature measurements suggest the potential of these materials for high temperature applications.

Type
Research Article
Copyright
Copyright © Materials Research Society 2004

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References

1. Chung, D-Y, Choi, K-S, Iordanidis, L., Schindler, J.L., Brazis, P.M., Kannewurf, C.R., Chen, B., Hu, S., Uher, C., Kanatzidis, M.G., Chem. Mater. 9, 12, p 3060, 1997 CrossRefGoogle Scholar
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