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Systematic analysis of the interplay between synthesis route, microstructure, and thermoelectric performance in p-type Mg2Si0.2Sn0.8

Kamila, Hasbuna and Goyal, G.K. and Sankhla, Aryan and Ponnusamy, Prasanna and Müller, Eckhard and Dasgupta, Titas and de Boor, Johannes (2019) Systematic analysis of the interplay between synthesis route, microstructure, and thermoelectric performance in p-type Mg2Si0.2Sn0.8. Materials Today Physics. Elsevier. DOI: 10.1016/j.mtphys.2019.100133 ISSN 2542-5293

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Abstract

For thermoelectric materials, the synthesis route is—besides composition—the crucial factor governing the thermoelectric transport properties and hence the performance of the material. Here, we present a systematic analysis of the influence of the synthesis technique on microstructure and thermoelectric transport properties in Li-doped Mg2Si0.2Sn0.8. The samples were prepared using two wide-spread, but quite different synthesis methods: high energy ball milling and induction melting. Microstructural analysis (scanning electron microscopy and X-ray diffraction) reveals that ball milled samples are more homogenous than induction melted ones, which exhibit some Si-rich Mg2(Si,Sn) and MgO as secondary phases. On a first glance, the thermoelectric properties are qualitatively similar with zTmax≈0.4 for both routes. However, a systematic analysis of the high temperature transport data in the framework of a single parabolic band model points out that the induction melted samples have a systematically reduced mobility and increased lattice thermal conductivity which can be tied to the differences in the microstructure. The reduced mobility can be attributed to a further carrier scattering mechanism for the induction melted samples in addition to the acoustic phonon and alloy scattering that are observed for both synthesis routes, while the increased lattice thermal conductivity is because of the larger grain size and presence of secondary phases. In consequence, this leads to significantly enhanced thermoelectric transport properties for ball milled samples (effective material parameter β is ∼20% larger) and a predicted relative difference in device efficiency of more than 10%.

Item URL in elib:https://elib.dlr.de/130546/
Document Type:Article
Title:Systematic analysis of the interplay between synthesis route, microstructure, and thermoelectric performance in p-type Mg2Si0.2Sn0.8
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Kamila, HasbunaGerman aerospace center, Institute of materials research, Köln, GermanyUNSPECIFIED
Goyal, G.K.Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay, Mumbai 400076, IndiaUNSPECIFIED
Sankhla, Aryangerman aerospace center, institute of materials research, köln, germanyhttps://orcid.org/0000-0002-1527-6902
Ponnusamy, Prasannagerman aerospace center, institute of materials research, köln, germanyUNSPECIFIED
Müller, EckhardGerman aerospace center, Institute of materials research, Köln, Germany and Institute for inorganic and analytical chemistry, Justus-Liebig-Universität Gießen, Heinrich-Buff-Ring 58, 35392 Gießen, GermanyUNSPECIFIED
Dasgupta, TitasDepartment of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay, Mumbai 400076, IndiaUNSPECIFIED
de Boor, JohannesGerman aerospace center, institute of materials research, köln, germanyhttps://orcid.org/0000-0002-1868-3167
Date:14 June 2019
Journal or Publication Title:Materials Today Physics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1016/j.mtphys.2019.100133
Publisher:Elsevier
ISSN:2542-5293
Status:Published
Keywords:Ball milling; induction melting; single parabolic band model; thermoelectrics; thermoelectric transport properties analysis
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Road Transport
DLR - Research area:Transport
DLR - Program:V ST Straßenverkehr
DLR - Research theme (Project):V - NGC Antriebssystem und Energiemanagement
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Thermoelectric Materials and Systems
Deposited By: Yasseri, Mohammad
Deposited On:15 Nov 2019 12:56
Last Modified:14 Dec 2019 04:25

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