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Electronic Transport in Alloys with Phase Separation (Composites)

Sonntag, Joachim and Lenoir, Bertrand and Ziolkowski, Pawel (2019) Electronic Transport in Alloys with Phase Separation (Composites). Open Journal of Composite Materials. Scientific Research Publishing. doi: 10.4236/ojcm.2019.91002. ISSN 2164-5612.

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Abstract

A measure for the efficiency of a thermoelectric material is the figure of merit defined by ZT = S2T/ρκ, where S, ρ and κ are the electronic transport coefficients, Seebeck coefficient, electrical resistivity and thermal conductiviy, respectively. T is the absolute temperature. Large values for ZT have been realized in nanostructured materials such as superlattices, quantum dots, nanocomposites, and nanowires. In order to achieve further progress, (1) a fundamental understand- ing of the carrier transport in nanocomposites is necessary, and (2) effective experimental methods for designing, producing and measuring new material compositions with nanocomposite-structures are to be applied. During the last decades a series of formulas has been derived for calculation of the electronic transport coefficients in composites and disordered alloys. Along the way, some puzzling phenomenons have been solved as why there are simple metals with positive thermopower? and what is the reason for the phenomenon of the ”Giant Hall effect”? and what is the reason for the fact that amorphous composites can exist at all? In the present review article, (1), formulas will be presented for calculation of σ(= 1/ρ), κ, S, and R in composites. R, the Hall coefficient, provides additional informations about the type of the dominant electronic carriers and their densities. It will be shown that these formulas can also be applied successfully for calculation of S, ρ, κ and R in nanocomposites if certain conditions are taken into account. Regarding point (2) we shall show that the combinatorial development of materials can provide unfeasible results if applied noncritically.

Item URL in elib:https://elib.dlr.de/130532/
Document Type:Article
Title:Electronic Transport in Alloys with Phase Separation (Composites)
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Sonntag, JoachimTE Connectivity Sensors Germany GmbH, Dortmund, GermanyUNSPECIFIED
Lenoir, BertrandInstitut Jean Lamour, UMR 7198 CNRS-Université de Lorraine, 2 Allée André Guinier-Campus ARTEM, Nancy Cedex, FranceUNSPECIFIED
Ziolkowski, PawelGerman Aerospace Center, Institute of Materials Research, Köln, GermanyUNSPECIFIED
Date:28 January 2019
Journal or Publication Title:Open Journal of Composite Materials
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
DOI :10.4236/ojcm.2019.91002
Publisher:Scientific Research Publishing
ISSN:2164-5612
Status:Published
Keywords:Hall effect; giant Hall effect; Seebeck coefficient (thermopower); electron density; Conductivity; thermal conductivity; composites; nanocomposites; percolation theory
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:propulsion systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Turbine Technologies (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Thermoelectric Materials and Systems
Deposited By: Yasseri, Mohammad
Deposited On:15 Nov 2019 12:55
Last Modified:15 Nov 2019 12:55

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