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Zintl phases as thermoelectric materials: Tuned transport properties of the compounds Ca_xYb_(1-x)Zn_2Sb_2

Gascoin, Franck and Ottensmann, Sandra and Stark, Daniel and Haile, Sossina M. and Snyder, G. Jeffrey (2005) Zintl phases as thermoelectric materials: Tuned transport properties of the compounds Ca_xYb_(1-x)Zn_2Sb_2. Advanced Functional Materials, 15 (11). pp. 1860-1864. ISSN 1616-301X. https://resolver.caltech.edu/CaltechAUTHORS:20131125-162531553

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Abstract

Zintl phases are ideal candidates for efficient thermoelectric materials, because they are typically small-bandgap semiconductors with complex structures. Furthermore, such phases allow fine adjustment of dopant concentration without disrupting electronic mobility, which is essential for optimizing thermoelectric material efficiency. The tunability of Zintl phases is demonstrated with the series Ca_xYb_(1-x)Zn_2Sb_2 (0 <= x <= 1). Measurements of the electrical conductivity, Hall mobility, Seebeck coefficient, and thermal conductivity (in the 300-800 K temperature range) show the compounds to behave as heavily doped semiconductors, with transport properties that can be systematically regulated by varying x. Within this series, x = 0 is the most metallic (lowest electrical resistivity, lowest Seebeck coefficient, and highest carrier concentration), and x = 1 is the most semiconducting (highest electrical resistivity, highest Seebeck coefficient, and lowest carrier concentration), while the mobility is largely independent of x. In addition, the structural disorder generated by the incorporation of multiple cations lowers the overall thermal conductivity significantly at intermediate compositions, increasing the thermoelectric figure of merit, zT Thus, both zT and the thermoelectric compatibility factor (like zT, a composite function of the transport properties) can be finely tuned to allow optimization of efficiency in a thermoelectric device.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1002/adfm.200500043DOIArticle
http://onlinelibrary.wiley.com/doi/10.1002/adfm.200500043/abstractPublisherArticle
ORCID:
AuthorORCID
Haile, Sossina M.0000-0002-5293-6252
Snyder, G. Jeffrey0000-0003-1414-8682
Additional Information:Copyright © 2005 WILEY-VCH. Issue published online: 27 OCT 2005. Article first published online: 22 SEP 2005. Manuscript Accepted: 31 MAY 2005. Manuscript Received: 24 JAN 2005. This work was supported by the NSF-funded Caltech Center for the Science and Engineering of Materials (MRSEC program) and carried out at the Jet Propulsion Laboratory, California Institute of Technology, under contract with NASA.
Funders:
Funding AgencyGrant Number
NSFUNSPECIFIED
NASA/JPL/CaltechUNSPECIFIED
Subject Keywords:CLATHRATE COMPOUND SEMICONDUCTOR ZN4SB3 Semiconductors; Thermoelectric materials; Zintl phases
Issue or Number:11
Record Number:CaltechAUTHORS:20131125-162531553
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20131125-162531553
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:42714
Collection:CaltechAUTHORS
Deposited By: Jonathan Gross
Deposited On:02 Dec 2013 20:38
Last Modified:03 Oct 2019 06:01

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