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Improved Thermoelectric Performance in Yb_(14)Mn_(1−x)Zn_xSb_(11) by the Reduction of Spin-Disorder Scattering

Brown, Shawna R. and Toberer, Eric S. and Ikeda, Teruyuki and Cox, Catherine A. and Gascoin, Franck and Kauzlarich, Susan M. and Snyder, G. Jeffrey (2008) Improved Thermoelectric Performance in Yb_(14)Mn_(1−x)Zn_xSb_(11) by the Reduction of Spin-Disorder Scattering. Chemistry of Materials, 20 (10). pp. 3412-3419. ISSN 0897-4756. doi:10.1021/cm703616q.

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Rare-earth transition metal compounds Yb_(14)Mn_(1−x)Zn_xSb_(11), isostructural with Ca_(14)AlSb_(11), have been prepared using a metal flux growth technique for thermoelectric property measurements (with x = 0.0, 0.2, 0.3, 0.4, 0.7, 0.9, and 1.0). Single-crystal X-ray diffraction and electron microprobe analysis data indicate the successful synthesis of a solid-solution for the Yb_(14)Mn_(1−x)Zn_xSb_(11) structure type for 0< x < 0.4. Hot-pressed polycrystalline samples showed that the product from the flux reaction was a pure phase from x = 0 through x = 0.4 with the presence of a minor secondary phase for compositions x > 0.4. High-temperature (298 K–1275 K) measurements of the Seebeck coefficient, resistivity, and thermal conductivity were performed on hot-pressed, polycrystalline samples. As the concentration of Zn increases in Yb_(14)Mn_(1−x)Zn_xSb_(11), the Seebeck coefficient remains unchanged for 0 ≤ x ≤ 0.7 indicating that the free carrier concentration has remained unchanged. However, as the nonmagnetic Zn^(2+) ions replace the magnetic Mn^(2+) ions, the spin disorder scattering is reduced, lowering the resistivity. Replacing the magnetic Mn^(2+) with non magnetic Zn^(2+) provides an independent means to lower resistivity without deleterious effects to the Seebeck values or thermal conduction. Alloying the Mn site with Zn reduces the lattice thermal conductivity at low temperatures but has negligible impact at high temperatures. The reduction of spin disorder scattering leads to an ∼10% improvement over Yb_(14)MnSb_(11), revealing a maximum thermoelectric figure of merit (zT) of ∼1.1 at 1275 K for Yb_(14)Mn_(0.6)Zn_(0.4)Sb_(11).

Item Type:Article
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URLURL TypeDescription ItemSupporting Information
Ikeda, Teruyuki0000-0001-7076-6958
Snyder, G. Jeffrey0000-0003-1414-8682
Additional Information:© 2008 American Chemical Society. Received 19 December 2007. Published online 24 April 2008. Published in print 1 May 2008. We thank Sarah Roeske for aid with the electron microprobe, James Fettinger, and Håkon Hope for assistance with the single-crystal refinement. Catherine A. Cox was supported by a NSF funded Bridge to Doctorate fellowship. Portions of this work were carried out at the Jet Propulsion Laboratory, California Institute of Technology, under contract with NASA. This research was funded by NSF DMR-0600742 and NASA/Jet Propulsion Laboratory.
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NSF Graduate Research FellowshipUNSPECIFIED
Issue or Number:10
Record Number:CaltechAUTHORS:20170203-100736154
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Official Citation:Improved Thermoelectric Performance in Yb14Mn1−xZnxSb11 by the Reduction of Spin-Disorder Scattering Shawna R. Brown, Eric S. Toberer, Teruyuki Ikeda, Catherine A. Cox, Franck Gascoin, Susan M. Kauzlarich, and G. Jeffrey Snyder Chemistry of Materials 2008 20 (10), 3412-3419 DOI: 10.1021/cm703616q
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:74013
Deposited By: Ruth Sustaita
Deposited On:03 Feb 2017 20:49
Last Modified:11 Nov 2021 05:24

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