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Tellurium-based Nanocomposites as Thermoelectric Materials

Falkenbach, Oliver and Koch, Guenter and Schmitz, Andreas and Schlecht, Sabine (2013) Tellurium-based Nanocomposites as Thermoelectric Materials. 32nd International Conference on Thermoelectrics, June 30.-July 04. 2013, Kobe, Japan.

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Abstract

Thermoelectric materials which are based on tellurium have been proven to be very effective for the medium temperature range. For example doping of lead telluride with silver-antimony-telluride lead to a ZT value of 2.2 at 800 K for the bulk.1 This extraordinary thermoelectric performance can be attributed mainly to the strongly reduced thermal conductivity due to the formation of Ag-Sb-nanodots which are embedded into the matrix and so do not affect the electrical conductivity.2 To understand the microstructure and the importance of the minority phase in this complex system and their influences on the thermoelectric properties various synthetic approaches are of great interest. In this work we applied a simple ball milling method to synthesize nanocomposites on the basis of a group-IV-telluride with different amounts of a dopand. Three compacting methods for those nanopowders such as cold pressing / annealing, hot pressing and short-term-sintering were compared regarding the density of the obtained pellets. The samples were characterized via x-ray diffraction patterns to analyze the phase composition and measuring the thermoelectric transport properties such as thermal conductivity, electrical conductivity and Seebeck coefficient. A TEM-study including EDX-measurements and electron-diffraction was performed to reveal form, size and agglomeration of the nanoparticles and the local distribution of the constituting elements. [1] K.-F. Hsu, S. Loo, F. Guo, W. Chen, J. S. Dyck, C. Uher, T. Hogan, E. K. Polychroniadis, M. G. Kanatzidis, Science 2004, 303, 818 - 821. [2] E. Quarez, K.-F. Hsu, R. Pcionek, N. Frangis, E. K. Polychroniadis, M. G. Kanatzidis, J. Am. Chem. Soc. 2005, 127, 9177 - 9190.

Item URL in elib:https://elib.dlr.de/86033/
Document Type:Conference or Workshop Item (Poster)
Title:Tellurium-based Nanocomposites as Thermoelectric Materials
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Falkenbach, OliverJustus-Liebig University, Institute for Inorganic and Analytical ChemistryUNSPECIFIED
Koch, GuenterJustus-Liebig University, Institute for Inorganic and Analytical ChemistryUNSPECIFIED
Schmitz, AndreasGerman Aerospace Center, Institute of Materials Research, Köln, GermanyUNSPECIFIED
Schlecht, SabineJustus-Liebig University, Institute for Inorganic and Analytical ChemistryUNSPECIFIED
Date:July 2013
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:nanocomposites; thermoelectric materials
Event Title:32nd International Conference on Thermoelectrics
Event Location:Kobe, Japan
Event Type:international Conference
Event Dates:June 30.-July 04. 2013
Organizer:ITS
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Terrestrial Vehicles (old)
DLR - Research area:Transport
DLR - Program:V BF - Bodengebundene Fahrzeuge
DLR - Research theme (Project):V - Project Fahrzeugenergiesysteme III (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Thermoelectric Materials and Systems
Deposited By: Zabrocki, Dr. Knud
Deposited On:02 Dec 2013 07:01
Last Modified:08 May 2014 23:26

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