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Influence of Sn on the structural and thermoelectric properties of the type-I clathrates Ba8Cu5Si6Ge35-xSnx (0 ≤ x ≤ 0.6)

Published online by Cambridge University Press:  18 January 2013

X. Yan ,
E. Bauer ,
P. Rogl  and
S. Paschen
X. Yan
Affiliation:
Institute of Solid State Physics, Vienna University of Technology, Wiedner Hauptstr. 8–10, 1040 Vienna, Austria.
E. Bauer
Affiliation:
Institute of Solid State Physics, Vienna University of Technology, Wiedner Hauptstr. 8–10, 1040 Vienna, Austria.
P. Rogl
Affiliation:
Institute of Physical Chemistry, University of Vienna, Währingerstr. 42, 1090 Vienna, Austria.
S. Paschen
Affiliation:
Institute of Solid State Physics, Vienna University of Technology, Wiedner Hauptstr. 8–10, 1040 Vienna, Austria.
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Abstract

On the search for cost-competitive thermoelectric clathrates we have investigated the influence of Sn substitutions for Ge on the structural and thermoelectric properties of the type-I clathrate Ba8Cu5Si6Ge35. The solid solubility of Sn was found to be limited to 0.6 atoms per unit cell. A series of compounds with the nominal compositions Ba8Cu5Si6Ge35-xSnx (x = 0.2, 0.4, 0.6) was synthesized in a high-frequency furnace. The samples were annealed, and subsequently ball milled and hot pressed. The hot pressed samples were characterized by X-ray powder diffraction, energy-dispersive X-ray spectroscopy and transport property measurements. Our results show that the substitution of Ge by Sn introduces vacancies at the 6d site of the type-I clathrate structure and shifts the highest dimensionless thermoelectric figure of merit ZT from 570 °C for the Sn free sample to lower temperatures. The highest figure of merit ZT = 0.42 is reached at about 320 °C for the Sn-substituted sample Ba8Cu5Si6Ge35Sn0.6.

Keywords

crystallographic structureclathratesthermoelectricity
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1490: Symposium B – Thermoelectric Materials Research and Device Development for Power Conversion and Refrigeration , 2013 , pp. 19 - 26
Copyright
Copyright © Materials Research Society 2013 

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