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High-Temperature Transport Properties of the Zintl Phases Yb_(11)GaSb_9 and Yb_(11)InSb_9

Yi, Tanghong and Cox, Catherine A. and Toberer, Eric S. and Snyder, G. Jeffrey and Kauzlarich, Susan M. (2010) High-Temperature Transport Properties of the Zintl Phases Yb_(11)GaSb_9 and Yb_(11)InSb_9. Chemistry of Materials, 22 (3). pp. 935-941. ISSN 0897-4756. http://resolver.caltech.edu/CaltechAUTHORS:20100224-112243080

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Abstract

Two rare-earth Zintl phases, Yb_(11)GaSb_9 and Yb_(11)InSb_9, were synthesized in high-temperature self-fluxes of molten Ga and In, respectively. Structures were characterized by both single-crystal X-ray diffraction and powder X-ray diffraction and are consistent with the published orthorhombic structure, with the space group Iba2. High-temperature differential scanning calorimetry (DSC) and thermal gravimetry (TG) measurements reveal thermal stability to 1300 K. Seebeck coefficient and resistivity measurements to 1000 K are consistent with the hypothesis that Yb_(11)GaSb_9 and Yb_(11)InSb_9 are small band gap semiconductors or semimetals. Low doping levels lead to bipolar conduction at high temperature, preventing a detailed analysis of the transport properties. Thermal diffusivity measurements yield particularly low lattice thermal conductivity values, less than 0.6 W/m K for both compounds. The low lattice thermal conductivity suggests that Yb_(11)MSb_9 (M = Ga, In) has the potential for high thermoelectric efficiency at high temperature if charge-carrier doping can be controlled.


Item Type:Article
Related URLs:
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http://dx.doi.org/10.1021/cm901824cDOIUNSPECIFIED
http://pubs.acs.org/doi/abs/10.1021/cm901824cPublisherUNSPECIFIED
Additional Information:© 2010 American Chemical Society. Received June 26, 2009. Revised Manuscript Received October 29, 2009. Publication Date (Web): November 23, 2009. We gratefully acknowledge the financial support from NSF DMR0600742, the NASA Jet Propulsion Laboratory, and the Beckman Foundation. A pdf showing the microprobe image and elemental mapping of the hot pressed pellets is provided. This material is available free of charge via the Internet at http://pubs.acs.org.
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NSFDMR0600742
NASA/JPLUNSPECIFIED
Beckman FoundationUNSPECIFIED
Record Number:CaltechAUTHORS:20100224-112243080
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20100224-112243080
Official Citation:High-Temperature Transport Properties of the Zintl Phases Yb11GaSb9 and Yb11InSb9 Tanghong Yi, Catherine A. Cox, Eric S. Toberer, G. Jeffrey Snyder, Susan M. Kauzlarich Chemistry of Materials 2010 22 (3), 935-941
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:17580
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:24 Feb 2010 21:32
Last Modified:28 Mar 2014 05:19

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