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High efficiency Mg2(Si,Sn)-based thermoelectric materials: scale-up synthesis, functional homogeneity, and thermal stability

Farahi, Nader and Stiewe, Christian and Truong, Dao Y Nhi and de Boor, Johannes and Müller, Eckhard (2019) High efficiency Mg2(Si,Sn)-based thermoelectric materials: scale-up synthesis, functional homogeneity, and thermal stability. RSC Advances. Royal Society of Chemistry. DOI: 10.1039/C9RA04800F ISSN 2046-2069

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Abstract

Considering the need for large quantities of high efficiency thermoelectric materials for industrial applications, a scalable synthesis method for high performance magnesium silicide based materials is proposed. The synthesis procedure consists of a melting step followed by high energy ball milling. All the materials synthesized via this method demonstrated not only high functional homogeneity but also high electrical conductivity and Seebeck coefficients of around 1000 Ω−1 cm−1 and −200 μV K−1 at 773 K, respectively. The measured values were similar for all the samples extracted from the ∅50 mm and ∅70 mm compacted pellets and were stable upon thermal cycling. Thermal stability experiments from 168 hours to 720 hours at 723 K revealed no significant change in the material properties. The low thermal conductivity of ∼2.5 W m−1 K−1 at 773 K led to a maximum figure of merit, zTmax, of 1.3 at the same temperature and an average value, zTavg, of 0.9 between 300 K and 773 K, which enables high efficiency in future silicide-based thermoelectric generators.

Item URL in elib:https://elib.dlr.de/130559/
Document Type:Article
Title:High efficiency Mg2(Si,Sn)-based thermoelectric materials: scale-up synthesis, functional homogeneity, and thermal stability
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Farahi, NaderGerman aerospace center, Institute of materials research, Köln, GermanyUNSPECIFIED
Stiewe, ChristianGerman Aerospace Center, Institute of Materials Research, Köln, Germanyhttps://orcid.org/0000-0002-1895-9258
Truong, Dao Y NhiGerman Aerospace Center, Institute of Materials Research, Köln, GermanyUNSPECIFIED
de Boor, JohannesGerman aerospace center, institute of materials research, köln, germanyhttps://orcid.org/0000-0002-1868-3167
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
Date:25 July 2019
Journal or Publication Title:RSC Advances
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1039/C9RA04800F
Publisher:Royal Society of Chemistry
ISSN:2046-2069
Status:Published
Keywords:High efficiency Mg2(Si,Sn); thermoelectric materials: scale-up synthesis; functional homogeneity; thermal stability
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Thermal Energy Storage
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Thermochemical Processes (Storage)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Thermoelectric Materials and Systems
Deposited By: Yasseri, Mohammad
Deposited On:15 Nov 2019 12:58
Last Modified:15 Nov 2019 12:58

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