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High Temperature Thermoelectric Properties of the Solid-Solution Zintl Phase Eu_(11)Cd_(6–x)Zn_xSb_(12)

Kazem, Nasrin and Hurtado, Antonio and Sui, Fan and Ohno, Saneyuki and Zevalkink, Alexandra and Snyder, Jeffrey G. and Kauzlarich, Susan M. (2015) High Temperature Thermoelectric Properties of the Solid-Solution Zintl Phase Eu_(11)Cd_(6–x)Zn_xSb_(12). Chemistry of Materials, 27 (12). pp. 4413-4421. ISSN 0897-4756. https://resolver.caltech.edu/CaltechAUTHORS:20150729-104037663

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Abstract

Solid-solution Zintl compounds with the formula Eu_(11)Cd_(6–x)Zn_xSb_(12) have been synthesized from the elements as single crystals using a tin flux according to the stoichiometry Eu:Cd:Zn:Sb:Sn of 11:6–x_p:x_p:12:30 with x_p = 0, 1, 2, 3, 4, 5, and 6, where x_p is the preparative amount of Zn employed in the reaction. The crystal structures and the compositions were established by single-crystal as well as powder X-ray diffraction and wavelength-dispersive X-ray analysis measurements. The title solid-solution Zintl compounds crystallize isostructurally in the centrosymmetric monoclinic space group C 2/m (No. 12, Z = 2) as the Sr_(11)Cd_6Sb_(12) structure type (Pearson symbol mC58). There is a miscibility gap at 3 ≤ x_p ≤ 4 where the major product crystallizes in a disordered structure related to the Ca_9Mn_4Bi_9 structure type; otherwise, for all other compositions, the Sr_(11)Cd_6Sb_(12) structure is the majority phase. Eu_(11)Cd_6Sb_(12) shows lower lattice thermal conductivity relative to Eu_(11)Zn_6Sb_(12) consistent with its higher mean atomic weight, and as anticipated, the solid-solution samples of Eu_(11)Cd_(6–x)Zn_xSb_(12) have effectively reduced lattice thermal conductivities relative to the end member compounds. Eu_(11.0(1))Cd_(4.5(2))Zn_(1.5(2))Sb_(12.0(1)) exhibits the highest zT value of >0.5 at around 800 K which is twice as large as the end member compounds.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1021/acs.chemmater.5b01301DOIArticle
http://pubs.acs.org/doi/suppl/10.1021/acs.chemmater.5b01301PublisherSupporting Information
ORCID:
AuthorORCID
Ohno, Saneyuki0000-0001-8192-996X
Snyder, Jeffrey G.0000-0003-1414-8682
Alternate Title:High Temperature Thermoelectric Properties of the Solid-Solution Zintl Phase Eu11Cd6–xZnxSb12
Additional Information:© 2015 American Chemical Society. Received: April 8, 2015; Revised: May 14, 2015; Published: May 20, 2015. We gratefully acknowledge support from NASA/JPL. We thank Dr. Sarah Roeske and Nick Botto for assistance with microprobe analysis. This research was funded by a GAANN fellowship (N.K.) and NSF Grant DMR-1405973. Use of the Advanced Photon Source was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357.
Funders:
Funding AgencyGrant Number
NASA/JPLUNSPECIFIED
GAANN FellowshipUNSPECIFIED
NSFDMR-1405973
Department of Energy (DOE)DE-AC02-06CH11357
Issue or Number:12
Record Number:CaltechAUTHORS:20150729-104037663
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150729-104037663
Official Citation:High Temperature Thermoelectric Properties of the Solid-Solution Zintl Phase Eu11Cd6–xZnxSb12 Nasrin Kazem, Antonio Hurtado, Fan Sui, Saneyuki Ohno, Alexandra Zevalkink, Jeffrey G. Snyder, and Susan M. Kauzlarich Chemistry of Materials 2015 27 (12), 4413-4421 DOI: 10.1021/acs.chemmater.5b01301
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59058
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:29 Jul 2015 18:57
Last Modified:17 Mar 2020 18:31

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