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Thermoelectric Properties of K2Bi8−xSbxSe13 Solid Solutions and Se Doping

Published online by Cambridge University Press:  21 March 2011

Theodora Kyratsi
Affiliation:
Department of Chemistry, Michigan State University, East Lansing, MI 48824 Department of Physics, Aristotle University of Thessaloniki, 54006 Thessaloniki, Greece
Jeffrey S. Dyck
Affiliation:
Department of Physics, University of Michigan, Ann Arbor, MI 48109
Wei Chen
Affiliation:
Department of Physics, University of Michigan, Ann Arbor, MI 48109
Duck-Young Chung
Affiliation:
Department of Chemistry, Michigan State University, East Lansing, MI 48824
Ctirad Uher
Affiliation:
Department of Physics, University of Michigan, Ann Arbor, MI 48109
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

Our efforts to improve the thermoelectric properties of β-K2Bi8Se13, led to systematic studies of solid solutions of the type β-K2Bi8−xSbxSe13. The charge transport properties and thermal conductivities were studied for selected members of the series. Lattice thermal conductivity decreases due to the mass fluctuation generated in the lattice by the mixed occupation of Sb and Bi atoms. Se excess as a dopant was found to increase the figure-of merit of the solid solutions.

Type
Research Article
Copyright
Copyright © Materials Research Society 2002

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References

1. (a) Kanatzidis, M.G., Semicond. Semimet., 69, p. 51 (2000), (b) D-Y Chung, L. Iordanidis, K-S Choi and M.G. Kanatzidis, Bull. Korean Chem. Soc., 19, 12 p. 1285 (1998)Google Scholar
2. 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)Google Scholar
3. Brazis, P.W., Rocci-Lane, M., Ireland, J.R., Chung, D-Y, Kanatzidis, M.G. and Kannewurf, C.R., Proceedings of the 18th International Conference on Thermoelectrics, 619 (1999)Google Scholar
4. Kyratsi, Th., Chung, D-Y and Kanatzidis, M.G., J. Alloys Compds, in press.Google Scholar
5. Kyratsi, Th., Dyck, J.S., Chen, W., Uher, C., Paraskevopoulos, K.M. and Kanatzidis, M.G., submitted.Google Scholar
6. Kyratsi, Th., Chung, D-Y, Choi, K-S, Dyck, J.S., Chen, W., Uher, C. and Kanatzidis, M.G., Mat. Res. Soc. Symp. Proc, 626, Z8.8.1 (2000)Google Scholar
7. Seebeck measurements of ingots of K2Bi8Se13 up to 700 K show a straight linear propagation of the thermopower without signs of saturation and reversal, unpublished results.Google Scholar
8. Genzel, L., Z. Physik, 135, 177 (1953)Google Scholar
9. Kittel, C., Introduction to Solid State Physics, 6th Eds.; John Wiley & Sons, Inc.: New York, 1986; p. 150 Google Scholar

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