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Charge Transfer and Local Structure in Thermoelectric Germanium Clathrates

Published online by Cambridge University Press:  10 February 2011

A.E.C. Palmqvist ,
B.B. Iversen ,
L.R. Furenlid ,
G.S. Nolas ,
D. Bryan ,
S. Latturner  and
G.D. Stucky
A.E.C. Palmqvist
Affiliation:
Department of Applied Surface Chemistry, Chalmers University of Technology, SE-412 96 Göteborg, Sweden, anders.palmqvist@surfchem.chalmers.se
B.B. Iversen
Affiliation:
Department of Chemistry, University of Aarhus, DK-8000 Aarhus C, Denmark
L.R. Furenlid
Affiliation:
Department of Radiology, University of Arizona, Tucson, AZ 85721
G.S. Nolas
Affiliation:
Marlow Industries Inc., Dallas, TX 75238-1645
D. Bryan
Affiliation:
Department of Chemistry, University of California, Santa Barbara, CA 93106
S. Latturner
Affiliation:
Department of Chemistry, University of California, Santa Barbara, CA 93106
G.D. Stucky
Affiliation:
Department of Chemistry, University of California, Santa Barbara, CA 93106
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Abstract

Germanium clathrates have recently received attention as potential highly efficient thermoelectric materials based on the phonon glass electron crystal (PGEC) concept [1-4]. A combined EXAFS and XANES study has been performed in order to investigate the local structure and the degree of charge transfer between the guest atoms and the framework atoms. Analysis of the Sr, Ga, and Ge K-edge XANES spectra of a Sr8Ga16Ge30 clathrate reveals that the atoms are close to neutrally charged and that the degree of charge transfer is low in agreement with recent theoretical predictions and charge density distribution measurements [3,5].

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 590: Symposium R – Applications of Synchrotron Radiation Techniques…V , 1999 , 51
Copyright
Copyright © Materials Research Society 2000

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References

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