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Structural and Thermoelectric Properties of Nanostructured Nominally Stoichiometric Pb1−xBixTe Prepared by Mechanical Alloying

Falkenbach, Oliver and Loeh, Marc O. and Wiegand, Christoph W. and Schmitz, Andreas and Hartung, David and Koch, Guenter and Klar, Peter J. and Müller, Eckhard and Schlecht, Sabine (2017) Structural and Thermoelectric Properties of Nanostructured Nominally Stoichiometric Pb1−xBixTe Prepared by Mechanical Alloying. Journal of Electronic Materials. Springer. DOI: 10.1007/s11664-017-5607-5 ISSN 0361-5235

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Abstract

We have investigated the influence of substituting bismuth for lead in lead telluride. The material was nanostructured by mechanical alloying and compacted via short-term sintering or hot pressing. Synthesis of samples with substitution up to 6 at.% bismuth was carried out twice to ensure reproducibility. All relevant thermoelectric transport parameters were measured in a wide temperature range from 123 K or 173 K to 773 K. Two different techniques for measuring the electrical conductivity and Seebeck coefficient were used, one at low and the other at high temperature. Higher bismuth content of 4 at.% to 6 at.% was found to result in the best thermoelectric properties, with maximum ZT value of about 0.7 at 723 K for 4.0 at.% bismuth. The structure was examined in detail via x-ray diffraction analysis, Raman spectroscopy, and transmission electron microscopy. A key feature of the microstructure was the inhomogeneous distribution of bismuth in the lead telluride matrix and the occurrence of bismuth-rich regions on the nanoscale, related to remarkably increased carrier concentration and mobility.

Item URL in elib:https://elib.dlr.de/115154/
Document Type:Article
Title:Structural and Thermoelectric Properties of Nanostructured Nominally Stoichiometric Pb1−xBixTe Prepared by Mechanical Alloying
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Falkenbach, OliverInstitute for Inorganic and Analytical Chemistry, Justus-Liebig-University, Giessen, GermanyUNSPECIFIED
Loeh, Marc O.Institute for Inorganic and Analytical Chemistry, Justus-Liebig-University, Giessen, GermanyUNSPECIFIED
Wiegand, Christoph W.Institute for Inorganic and Analytical Chemistry, Justus-Liebig-University, Giessen, GermanyUNSPECIFIED
Schmitz, AndreasInstitute of Materials Research, German Aerospace Center (DLR), Cologne, GermanyUNSPECIFIED
Hartung, DavidInstitute of Experimental Physics I, Justus-Liebig-University, Giessen, GermanyUNSPECIFIED
Koch, GuenterInstitute for Inorganic and Analytical Chemistry, Justus-Liebig-University, Giessen, GermanyUNSPECIFIED
Klar, Peter J.institute of experimental physics i, justus-liebig-university gießen, heinrich-buff-ring 16, 35392 gießen, germanyUNSPECIFIED
Müller, Eckhardgerman aerospace center, institute of materials research, köln, germany and justus liebig university giessen, institute of inorganic and analytical chemistry, 35392 giessen, germanyUNSPECIFIED
Schlecht, Sabineinstitute of inorganic and analytical chemistry, justus-liebig-university gießen, heinrich-buff-ring 58, 35392 gießen, germanyUNSPECIFIED
Date:31 May 2017
Journal or Publication Title:Journal of Electronic Materials
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1007/s11664-017-5607-5
Publisher:Springer
ISSN:0361-5235
Status:Published
Keywords:Thermoelectric materials, Compacting methods, Temperature Treatment, Raman spectroscopy
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Thermal Energy Storage
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Thermochemical Processes (Storage)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Thermoelectric Materials and Systems
Deposited By: Yasseri, Mohammad
Deposited On:22 Nov 2017 10:22
Last Modified:31 Jul 2019 20:12

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