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Mechanochemical synthesis and high temperature thermoelectric properties of calcium-doped lanthanum telluride La_(3−x)Ca_xTe_4

Ma, James M. and Clarke, Samantha M. and Zeier, Wolfgang G. and Vo, Trinh and von Allmen, Paul and Snyder, G. Jeffrey and Kaner, Richard B. and Fleurial, Jean-Pierre and Bux, Sabah K. (2015) Mechanochemical synthesis and high temperature thermoelectric properties of calcium-doped lanthanum telluride La_(3−x)Ca_xTe_4. Journal of Materials Chemistry C, 3 (40). pp. 10459-10466. ISSN 2050-7526. https://resolver.caltech.edu/CaltechAUTHORS:20150810-100645306

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Abstract

The thermoelectric properties from 300–1275 K of calcium-doped La_(3−x)Te_4 are reported. La_(3−x)Te_4 is a high temperature n-type thermoelectric material with a previously reported zT_(max) 1.1 at 1273 K and x = 0.23. Computational modeling suggests the La atoms define the density of states of the conduction band for La_(3−x)Te_4. Doping with Ca^(2+) on the La^(3+) site is explored as a means of modifying the density of states to improve the power factor and to achieve a finer control over the carrier concentration. High purity, oxide-free samples are produced by ball milling of the elements and consolidation by spark plasma sintering. Calcium substitution upon the lanthanum site was confirmed by a combination of Rietveld refinements of powder X-ray diffraction data and wave dispersive spectroscopy. A zT_(max) 1.2 is reached at 1273 K for the composition La_(2.2)Ca_(0.78)Te_4 and the relative increase compared to La_(3−x)Te_4 is attributed to the finer carrier concentration.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1039/c5tc01648gDOIArticle
http://pubs.rsc.org/en/Content/ArticleLanding/2015/TC/C5TC01648GPublisherArticle
ORCID:
AuthorORCID
Snyder, G. Jeffrey0000-0003-1414-8682
Bux, Sabah K.0000-0002-5372-354X
Alternate Title:Mechanochemical synthesis and high temperature thermoelectric properties of calcium-doped lanthanum telluride La3−xCaxTe4
Additional Information:© 2015 The Royal Society of Chemistry. Received 04 Jun 2015, Accepted 22 Jun 2015, First published online 31 Jul 2015. The authors would also like to thank Frank T. Kyte (Earth and Space Science Institute, UCLA) for his assistance in electron microprobe analysis. This work was performed at the Jet Propulsion Laboratory, California Institute of Technology under contract with the National Aeronautics and Space Administration. This work was supported by the NASA Science Missions Directorate’s Radioisotope Power Systems Technology Advancement Program. Support was also provided in part by NSF IGERT: Materials Creation Training Program (MCTP) – DGE-0654431, the California NanoSystems Institute, EFRC Solid-State Solar-Thermal Energy Conversion Center (S3TEC) award number DE-SC0001299, the Summer Undergraduate Research Fellowship (SURF) through CalTech and JPL, and the UCLA MSD Scholars Program.
Funders:
Funding AgencyGrant Number
NASA/JPL/CaltechUNSPECIFIED
California Nanosystems InstituteUNSPECIFIED
NSFDGE-0654431
Department of Energy (DOE)DE-SC0001299
Caltech Summer Undergraduate Research Fellowship (SURF)UNSPECIFIED
UCLA MSD Scholars ProgramUNSPECIFIED
Issue or Number:40
Record Number:CaltechAUTHORS:20150810-100645306
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150810-100645306
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59347
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:10 Aug 2015 17:24
Last Modified:09 Mar 2020 13:18

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