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Title: Criteria for extending the operation periods of thermoelectric converters based on IV-VI compounds

Abstract

The recent energy demands affected by the dilution of conventional energy resources and the growing awareness of environmental considerations, had positioned the research of renewable energy conversion methods in general and of thermoelectric direct conversion of thermal into electrical energies in particular, in the forefront of the currently active applicative sciences. IV-VI thermoelectric compounds (e.g. GeTe, PbTe and SnTe) and their alloys comprise some of the most efficient thermoelectric compositions ever reported. Yet a proper utilization of such materials in practical thermoelectric devices, still requires an overcoming the so-called technological “valley of death”, including among others, transport properties' degradation, due to sublimation of volatile Te rich species, while being subjected to elevated temperatures for long periods of time. In an attempt to establish practical operation criteria for extending the operation periods of such thermoelectric converters, it is currently shown based on thermal gravimetric and metallurgical considerations that such harmful sublimation can be practically bridged over by limiting the maximal operating temperatures to the 410–430 °C range for GeTe rich alloys and to 510–530 °C for PbTe and SnTe rich alloys, depending of the thermoelectric leg's diameter. - Graphical abstract: Evaporation rate in the GeTe and PbTe system showing the measuredmore » evaporation rates and the maximal operating temperatures for different compositions. In addition, the microstructure after evaporation is shown for PbTe, TAGS-85, and doped Pb{sub 0.13}Ge{sub 087}Te. Display Omitted - Highlights: • Evaporation rates of GeTe and PbTe based thermoelectric compounds were determined. • A criterion for their maximum operating temperature was established. • The materials showed phase separations and off-stoichiometry compositions.« less

Authors:
 [1];  [2]; ; ;  [1]
  1. Department of Materials Engineering, Ben-Gurion University of the Negev, Beer-Sheva (Israel)
  2. Department of Chemistry, Ben-Gurion University of the Negev, Beer-Sheva (Israel)
Publication Date:
OSTI Identifier:
22584196
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 241; Other Information: Copyright (c) 2016 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ALLOYS; DOPED MATERIALS; ENERGY CONVERSION; ENERGY DEMAND; GERMANIUM; GERMANIUM TELLURIDES; LEAD; LEAD TELLURIDES; MICROSTRUCTURE; SUBLIMATION; THERMOELECTRIC GENERATORS; TIN TELLURIDES; VOLATILITY

Citation Formats

Sadia, Yatir, E-mail: yatttir@yahoo.com, Ohaion-Raz, Tsion, Ben-Yehuda, Ohad, Korngold, Meidad, and Gelbstein, Yaniv. Criteria for extending the operation periods of thermoelectric converters based on IV-VI compounds. United States: N. p., 2016. Web. doi:10.1016/J.JSSC.2016.06.006.
Sadia, Yatir, E-mail: yatttir@yahoo.com, Ohaion-Raz, Tsion, Ben-Yehuda, Ohad, Korngold, Meidad, & Gelbstein, Yaniv. Criteria for extending the operation periods of thermoelectric converters based on IV-VI compounds. United States. doi:10.1016/J.JSSC.2016.06.006.
Sadia, Yatir, E-mail: yatttir@yahoo.com, Ohaion-Raz, Tsion, Ben-Yehuda, Ohad, Korngold, Meidad, and Gelbstein, Yaniv. Thu . "Criteria for extending the operation periods of thermoelectric converters based on IV-VI compounds". United States. doi:10.1016/J.JSSC.2016.06.006.
@article{osti_22584196,
title = {Criteria for extending the operation periods of thermoelectric converters based on IV-VI compounds},
author = {Sadia, Yatir, E-mail: yatttir@yahoo.com and Ohaion-Raz, Tsion and Ben-Yehuda, Ohad and Korngold, Meidad and Gelbstein, Yaniv},
abstractNote = {The recent energy demands affected by the dilution of conventional energy resources and the growing awareness of environmental considerations, had positioned the research of renewable energy conversion methods in general and of thermoelectric direct conversion of thermal into electrical energies in particular, in the forefront of the currently active applicative sciences. IV-VI thermoelectric compounds (e.g. GeTe, PbTe and SnTe) and their alloys comprise some of the most efficient thermoelectric compositions ever reported. Yet a proper utilization of such materials in practical thermoelectric devices, still requires an overcoming the so-called technological “valley of death”, including among others, transport properties' degradation, due to sublimation of volatile Te rich species, while being subjected to elevated temperatures for long periods of time. In an attempt to establish practical operation criteria for extending the operation periods of such thermoelectric converters, it is currently shown based on thermal gravimetric and metallurgical considerations that such harmful sublimation can be practically bridged over by limiting the maximal operating temperatures to the 410–430 °C range for GeTe rich alloys and to 510–530 °C for PbTe and SnTe rich alloys, depending of the thermoelectric leg's diameter. - Graphical abstract: Evaporation rate in the GeTe and PbTe system showing the measured evaporation rates and the maximal operating temperatures for different compositions. In addition, the microstructure after evaporation is shown for PbTe, TAGS-85, and doped Pb{sub 0.13}Ge{sub 087}Te. Display Omitted - Highlights: • Evaporation rates of GeTe and PbTe based thermoelectric compounds were determined. • A criterion for their maximum operating temperature was established. • The materials showed phase separations and off-stoichiometry compositions.},
doi = {10.1016/J.JSSC.2016.06.006},
journal = {Journal of Solid State Chemistry},
number = ,
volume = 241,
place = {United States},
year = {Thu Sep 15 00:00:00 EDT 2016},
month = {Thu Sep 15 00:00:00 EDT 2016}
}