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Thermoelectric performance of Li doped, p-type Mg2(Ge,Sn) and comparison with Mg2(Si,Sn)

de Boor, J. and Saparamadu, U. and Mao, J. and Dahal, K. and Müller, Eckhard and Ren, Zhifeng (2016) Thermoelectric performance of Li doped, p-type Mg2(Ge,Sn) and comparison with Mg2(Si,Sn). Acta Materialia, 120, pp. 273-280. Elsevier. DOI: 10.1016/j.actamat.2016.08.057 ISSN 1359-6454

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Official URL: http://dx.doi.org/10.1016/j.actamat.2016.08.057

Abstract

Solid solutions with chemical formula Mg2(Si,Ge,Sn) are promising thermoelectric materials with very good properties for the n-type material but significantly worse for the p-type. For power generation applications good n- and p-type materials are required and it has been shown recently that Li doping can enhance the carrier concentration and improve the thermoelectric properties for p-type Mg2Si1-xSnx. We have investigated the potential of p-type Mg2(Ge,Sn) by optimizing Mg2Ge0.4Sn0.6 using Li as dopant. We were able to achieve high carrier concentrations (1.4 x 10^20 cm-³) and relatively high hole mobilities resulting in high power factors of 1.7 x 10^(-3) Wm^(-1) K^(-2) at 700 K, the highest value reported so far for this class of material. Exchanging Ge by Si allows for a systematic comparison of Mg2(Ge,Sn) with Mg2(Si,Sn) and shows that Si containing samples exhibit a lower power factor but also a lower thermal conductivity resulting in comparable thermoelectric figure-of-merit. The data is furthermore analyzed in the framework of a single parabolic band model to gain insight on the effect of composition on band structure.

Item URL in elib:https://elib.dlr.de/109978/
Document Type:Article
Title:Thermoelectric performance of Li doped, p-type Mg2(Ge,Sn) and comparison with Mg2(Si,Sn)
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
de Boor, J.German aerospace center, Institute of materials research, Köln, GermanyUNSPECIFIED
Saparamadu, U.Department of Physics and Texas Center for Superconductivity, University of Houston, Houston, TX 77204, USAUNSPECIFIED
Mao, J.Department of Physics and Texas Center for Superconductivity, University of Houston, Houston, TX 77204, USAUNSPECIFIED
Dahal, K.Department of Physics and Texas Center for Superconductivity, University of Houston, Houston, TX 77204, USAUNSPECIFIED
Müller, EckhardGerman aerospace center, Institute of materials research, Köln, Germany and Justus Liebig university Giessen, Institute of inorganic and analytical chemistry, 35392 Giessen, GermanyUNSPECIFIED
Ren, ZhifengDepartment of Physics and Texas Center for Superconductivity, University of Houston, Houston, TX 77204, USAUNSPECIFIED
Date:1 September 2016
Journal or Publication Title:Acta Materialia
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:120
DOI :10.1016/j.actamat.2016.08.057
Page Range:pp. 273-280
Publisher:Elsevier
ISSN:1359-6454
Status:Published
Keywords:Thermoelectrics, Silicides, Electrical Transport, Mechanical alloying, Electrictronic band structure
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Terrestrial Vehicles (old)
DLR - Research area:Transport
DLR - Program:V BF - Bodengebundene Fahrzeuge
DLR - Research theme (Project):V - NGC-Antriebsstrang (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Thermoelectric Materials and Systems
Deposited By: Yasseri, Mohammad
Deposited On:16 Feb 2017 07:02
Last Modified:31 Jul 2019 20:07

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