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Improvement of electrical conductivity in Pb0.96−yMn0.04SnyTe alloys for high temperature thermoelectric applications

Bali, Ashoka and de Boor, Johannes and Dadda, Jayaram and Müller, Eckhard and Mallik, Ramesh Chandra (2014) Improvement of electrical conductivity in Pb0.96−yMn0.04SnyTe alloys for high temperature thermoelectric applications. RSC Advances, 4 (78), pp. 41425-41432. Royal Society of Chemistry. DOI: 10.1039/C4RA06042C ISSN 2046-2069

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Abstract

Lead–tin–telluride is a well-known thermoelectric material in the temperature range 350–750 K. Here, this alloy doped with manganese (Pb0.96−yMn0.04SnyTe) was prepared for different amounts of tin. X-ray diffraction showed a decrease of the lattice constant with increasing tin content, which indicated solid solution formation. Microstructural analysis showed a wide distribution of grain sizes from <1 μm to 10 μm and the presence of a SnTe rich phase. All the transport properties were measured in the range of 300−720 K. The Seebeck coefficient showed that all the samples were p-type indicating holes as dominant carriers in the measurement range. The magnitude increased systematically on reduction of the Sn content due to possible decreasing hole concentration. Electrical conductivity showed the degenerate nature of the samples. Large values of the electrical conductivity could have possibly resulted from a large hole concentration due to a high Sn content and secondly, due to increased mobility by sp–d orbital interaction between the Pb1−ySnyTe sublattice and the Mn2+ ions. High thermal conductivity was observed due to higher electronic contribution, which decreased systematically with decreasing Sn content. The highest zT = 0.82 at 720 K was obtained for the alloy with the lowest Sn content (y = 0.56) due to the optimum doping level.

Item URL in elib:https://elib.dlr.de/92616/
Document Type:Article
Title:Improvement of electrical conductivity in Pb0.96−yMn0.04SnyTe alloys for high temperature thermoelectric applications
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Bali, AshokaThermoelectric Materials & Devices Laboratory, Department of Physics, Indian Institute of Science, Bangalore-560012, IndiaUNSPECIFIED
de Boor, JohannesGerman Aerospace Center, Institute of Materials Research, Köln, GermanyUNSPECIFIED
Dadda, JayaramGerman Aerospace Center, Institute of Materials Research, Köln, 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
Mallik, Ramesh ChandraThermoelectric Materials & Devices Laboratory, Department of Physics, Indian Institute of Science, Bangalore-560012, IndiaUNSPECIFIED
Date:5 September 2014
Journal or Publication Title:RSC Advances
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:4
DOI :10.1039/C4RA06042C
Page Range:pp. 41425-41432
Publisher:Royal Society of Chemistry
ISSN:2046-2069
Status:Published
Keywords:thermoelecric, high temperatures
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion and Use (old)
HGF - Program Themes:Energy-efficient Processes (old)
DLR - Research area:Energy
DLR - Program:E EV - Energy process technology
DLR - Research theme (Project):E - Thermochemical Processes (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Thermoelectric Materials and Systems
Deposited By: Zabrocki, Dr. Knud
Deposited On:01 Dec 2014 10:13
Last Modified:23 Jan 2018 05:02

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