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Insight on the interplay between synthesis conditions and thermoelectric properties of α-MgAgSb

Camut, Julia and Barber Rodriguez, Ignacio and Kamila, Hasbuna and Cowley, A. and Sottong, Reinhard and Müller, Eckhard and de Boor, Johannes (2019) Insight on the interplay between synthesis conditions and thermoelectric properties of α-MgAgSb. Materials. Multidisciplinary Digital Publishing Institute (MDPI). DOI: 10.3390/ma12111857 ISSN 1996-1944

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Abstract

α-MgAgSb is a very promising thermoelectric material with excellent thermoelectric properties between room temperature and 300 °C, a range where few other thermoelectric materials show good performance. Previous reports rely on a two-step ball-milling process and/or time-consuming annealing. Aiming for a faster and scalable fabrication route, herein, we investigated other potential synthesis routes and their impact on the thermoelectric properties of α-MgAgSb. We started from a gas-atomized MgAg precursor and employed ball-milling only in the final mixing step. Direct comparison of high energy ball-milling and planetary ball-milling revealed that high energy ball milling already induced formation of MgAgSb, while planetary ball milling did not. This had a strong impact on the microstructure and secondary phase fraction, resulting in superior performance of the high energy ball milling route with an attractive average thermoelectric figure of merit of zT avg = 0.9. We also show that the formation of undesired secondary phases cannot be avoided by a modification of the sintering temperature after planetary ball milling, and discuss the influence of commonly observed secondary phases on the carrier mobility and on the thermoelectric properties of α-MgAgSb.

Item URL in elib:https://elib.dlr.de/130581/
Document Type:Article
Title:Insight on the interplay between synthesis conditions and thermoelectric properties of α-MgAgSb
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Camut, JuliaInstitute of Materials Research, German Aerospace Center, Linder Hoehe, 51147 Cologne, Germany and European Astronaut Centre, Linder Hoehe, Cologne 51147, GermanyUNSPECIFIED
Barber Rodriguez, IgnacioInstitute of Materials Research, German Aerospace Center, Linder Hoehe, 51147 Cologne, Germany and European Astronaut Centre, Linder Hoehe, Cologne 51147, GermanyUNSPECIFIED
Kamila, HasbunaGerman aerospace center, Institute of materials research, Köln, GermanyUNSPECIFIED
Cowley, A.European Astronaut Centre, KölnUNSPECIFIED
Sottong, ReinhardGerman 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
de Boor, JohannesGerman aerospace center, institute of materials research, köln, germanyhttps://orcid.org/0000-0002-1868-3167
Date:7 June 2019
Journal or Publication Title:Materials
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.3390/ma12111857
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
ISSN:1996-1944
Status:Published
Keywords:Thermoelectrics; semiconductors; synthesis optimization; MgAgSb; properties; ball-milling; sintering
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Technik für Raumfahrtsysteme
DLR - Research theme (Project):R - Systemtechnologien
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Thermoelectric Materials and Systems
Deposited By: Yasseri, Mohammad
Deposited On:14 Nov 2019 17:44
Last Modified:20 Feb 2020 15:06

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