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Synthesis and Characterization of Inorganic Clathrate-II Materials

Published online by Cambridge University Press:  01 February 2011

Matt Beekman  and
George S. Nolas
Matt Beekman
Affiliation:
mbeekman@cas.usf.edu, University of South Florida, Department of Physics, 4204 East Fowler Ave., Tampa, FL, 33620, United States
George S. Nolas
Affiliation:
gnolas@cas.usf.edu, University of South Florida, Department of Physics, 4204 East Fowler Ave., Tampa, FL, 33620, United States
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Abstract

Preliminary results from an investigation into the synthesis and characterization of silicon and germanium type II clathrates are reported. A series of NaxSi136 (0 < x < 24) clathrates was synthesized and characterized by powder X-ray diffraction and Rietveld analysis. The NaxSi136 lattice parameters are observed to first decrease, then increase with increasing Na content, indicating a non-monotonic structural response to Na filling. New type II Ge clathrate compositions Cs8Na16MyGe136-y (M = Cu, In) utilizing framework substitution are reported. Electrical transport measurements on a Cu substituted specimen indicate framework substitution modifies the transport properties of these materials. The potential type II clathrate phases possess for thermoelectric applications is discussed.

Keywords

thermoelectricityx-ray diffraction (XRD)structural
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1044: Symposium U – Thermoelectric Power Generation , 2007 , 1044-U05-05
Copyright
Copyright © Materials Research Society 2008

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