Experimental investigation of the predicted band structure modification of Mg2X (X: Si, Sn) thermoelectric materials due to scandium addition

Sankhla, Aryan and Yasseri, Mohammad and Kamila, Hasbuna and Müller, Eckhard and de Boor, Johannes (2019) Experimental investigation of the predicted band structure modification of Mg2X (X: Si, Sn) thermoelectric materials due to scandium addition. Journal of Applied Physics. American Institute of Physics (AIP). DOI: 10.1063/1.5089720 ISSN 0021-8979

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Abstract

Modification of the electronic band structure via doping is an effective way to improve the thermoelectric properties of a material. Theoretical calculations from a previous study have predicted that Sc substitution on the Mg site in Mg2X materials drastically increase their Seebeck coefficient. Herein, we experimentally studied the influence of scandium substitution on the thermoelectric properties of Mg2Si0.4Sn0.6 and Mg2Sn. We found that the thermoelectric properties of these materials are unaffected by Sc addition, and we did not find hints for a modification of the electronic band structure. The SEM-energy dispersive X-ray analysis revealed that the scandium does not substitute Mg but forms a secondary phase (Sc-Si) in Mg2Si0.4Sn0.6 and remains inert in Mg2Sn, respectively. Thus, this study proves that scandium is an ineffective dopant for Mg2X materials.

Item URL in elib:

https://elib.dlr.de/130554/

Document Type:

Article

Title:

Experimental investigation of the predicted band structure modification of Mg2X (X: Si, Sn) thermoelectric materials due to scandium addition

Authors:

Authors	Institution or Email of Authors	Author's ORCID iD
Sankhla, Aryan	german aerospace center, institute of materials research, köln, germany	https://orcid.org/0000-0002-1527-6902
Yasseri, Mohammad	German aerospace center, Institute of materials research, Köln, Germany and Justus Liebig university Giessen, Institute of inorganic and analytical chemistry, 35392 Giessen, Germany	UNSPECIFIED
Kamila, Hasbuna	German aerospace center, Institute of materials research, Köln, Germany	UNSPECIFIED
Müller, Eckhard	German 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, Germany	UNSPECIFIED
de Boor, Johannes	German aerospace center, institute of materials research, köln, germany	https://orcid.org/0000-0002-1868-3167

Date:

11 June 2019

Journal or Publication Title:

Journal of Applied Physics

Refereed publication:

Yes

Open Access:

Yes

Gold Open Access:

In SCOPUS:

Yes

In ISI Web of Science:

Yes

DOI :

10.1063/1.5089720

Publisher:

American Institute of Physics (AIP)

ISSN:

0021-8979

Status:

Published

Keywords:

Ball milling; silicides; thermoelectric materials

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 17:39

Last Modified:

11 Jun 2020 03:00

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