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Decomposition phenomena of Zn13 Sb10 under working conditions of thermoelectric generators and maximum current densities for electromigration

Jakob, Matthias and Grauer, Maxim and Oeckler, Oliver and Ziolkowski, Pawel (2019) Decomposition phenomena of Zn13 Sb10 under working conditions of thermoelectric generators and maximum current densities for electromigration. ACS Applied Energy Materials. American Chemical Society (ACS). doi: 10.1021/acsaem.9b02138. ISSN 2574-0962.

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Abstract

The mixed ionic-electronic conductor (MIEC) Zn13−δSb10 is a thermoelectric material with high performance at intermediate temperatures and contains only abundant elements. This work evaluates its suitability for thermoelectric applications with respect to thermal instability and decomposition by electromigration of Zn under current flow. In addition to the formation of Zn whiskers, this migration often leads to cracks. Thermoelectric measurements of bulk Zn13−δSb10 (δ ∼ 0.2) prepared by a slow cooling method show zT values of 0.7 at 200 °C. A series of tests under flowing currents with different voltages and current densities on bar-shaped samples was followed by the space-resolved investigation of their composition and its systematical correlation with the Seebeck coefficient. The latter increases upon Zn depletion, especially when ZnSb is formed. At room temperature (RT), Zn migration starts at a voltage of ∼0.01 V, which is much lower than for other MIECs like copper chalcogenides. At higher electrical fields, which may be enhanced by the Seebeck voltage, the amount of deposited Zn at the negative pole increases with the current density even if the transported charge is kept constant.

Item URL in elib:https://elib.dlr.de/137187/
Document Type:Article
Title:Decomposition phenomena of Zn13 Sb10 under working conditions of thermoelectric generators and maximum current densities for electromigration
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Jakob, MatthiasInstitute for Mineralogy, Crystallography and Materials Science; Faculty of Chemistry and Mineralogy, Leipzig University, Scharnhorststraße 20, 04275 Leipzig, GermanyUNSPECIFIED
Grauer, MaximInstitute for Mineralogy, Crystallography and Materials Science; Faculty of Chemistry and Mineralogy, Leipzig University, Scharnhorststraße 20, 04275 Leipzig, GermanyUNSPECIFIED
Oeckler, OliverInstitute for Mineralogy, Crystallography and Materials Science, Faculty of Chemistry and Mineralogy, Leipzig University, Scharnhorststr. 20, 04275 Leipzig, GermanyUNSPECIFIED
Ziolkowski, PawelGerman Aerospace Center, Institute of Materials Research, Köln, GermanyUNSPECIFIED
Date:23 December 2019
Journal or Publication Title:ACS Applied Energy Materials
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1021/acsaem.9b02138
Publisher:American Chemical Society (ACS)
ISSN:2574-0962
Status:Published
Keywords:Thermoelectrics, Zn13−xSb10, Material degradation, Electromigration, Zn mobility
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: Frank, Adina
Deposited On:06 Nov 2020 10:36
Last Modified:23 Dec 2020 03:00

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