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Thermoelectric properties of in-situ plasma spray synthesized sub-stoichiometry TiO(2−x)
The thermoelectric properties of sub-stoichiometric TiO(2−x) deposits produced by cascaded-plasma spray process are investigated from room-temperature to 750 K. Sub-stoichiometric TiO(2−x) deposits are formed through in-situ reaction of the TiO(1.9) within the high temperature plasma flame and manip...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group
2016
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5109908/ https://www.ncbi.nlm.nih.gov/pubmed/27811954 http://dx.doi.org/10.1038/srep36581 |
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author | Lee, Hwasoo Han, Su Jung Chidambaram Seshadri, Ramachandran Sampath, Sanjay |
author_facet | Lee, Hwasoo Han, Su Jung Chidambaram Seshadri, Ramachandran Sampath, Sanjay |
author_sort | Lee, Hwasoo |
collection | PubMed |
description | The thermoelectric properties of sub-stoichiometric TiO(2−x) deposits produced by cascaded-plasma spray process are investigated from room-temperature to 750 K. Sub-stoichiometric TiO(2−x) deposits are formed through in-situ reaction of the TiO(1.9) within the high temperature plasma flame and manipulated through introduction of varying amounts of hydrogen in the plasma. Although the TiO(2−x) particles experience reduction within plasma, it can also re-oxidize through interaction with the surrounding ambient atmosphere, resulting in a complex interplay between process conditions and stoichiometry. The deposits predominantly contain rutile phase with presence of Magneli phases especially under significantly reducing plasma conditions. The resultant deposits show sensitivity to thermoelectric properties and under certain optimal conditions repeatedly show Seebeck coefficients reaching values of −230 μV K(−1) at temperatures of 750 K while providing an electrical conductivity of 5.48 × 10(3) S m(−1), relatively low thermal conductivity in the range of 1.5 to 2 W m(−1) K(−1) resulting in power factor of 2.9 μW cm(−1) K(−2). The resultant maximum thermoelectric figure of merit value reached 0.132 under these optimal conditions. The results point to a potential pathway for a large-scale fabrication of low-cost oxide based thermoelectric with potential applicability at moderate to high temperatures. |
format | Online Article Text |
id | pubmed-5109908 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2016 |
publisher | Nature Publishing Group |
record_format | MEDLINE/PubMed |
spelling | pubmed-51099082016-11-25 Thermoelectric properties of in-situ plasma spray synthesized sub-stoichiometry TiO(2−x) Lee, Hwasoo Han, Su Jung Chidambaram Seshadri, Ramachandran Sampath, Sanjay Sci Rep Article The thermoelectric properties of sub-stoichiometric TiO(2−x) deposits produced by cascaded-plasma spray process are investigated from room-temperature to 750 K. Sub-stoichiometric TiO(2−x) deposits are formed through in-situ reaction of the TiO(1.9) within the high temperature plasma flame and manipulated through introduction of varying amounts of hydrogen in the plasma. Although the TiO(2−x) particles experience reduction within plasma, it can also re-oxidize through interaction with the surrounding ambient atmosphere, resulting in a complex interplay between process conditions and stoichiometry. The deposits predominantly contain rutile phase with presence of Magneli phases especially under significantly reducing plasma conditions. The resultant deposits show sensitivity to thermoelectric properties and under certain optimal conditions repeatedly show Seebeck coefficients reaching values of −230 μV K(−1) at temperatures of 750 K while providing an electrical conductivity of 5.48 × 10(3) S m(−1), relatively low thermal conductivity in the range of 1.5 to 2 W m(−1) K(−1) resulting in power factor of 2.9 μW cm(−1) K(−2). The resultant maximum thermoelectric figure of merit value reached 0.132 under these optimal conditions. The results point to a potential pathway for a large-scale fabrication of low-cost oxide based thermoelectric with potential applicability at moderate to high temperatures. Nature Publishing Group 2016-11-04 /pmc/articles/PMC5109908/ /pubmed/27811954 http://dx.doi.org/10.1038/srep36581 Text en Copyright © 2016, The Author(s) http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
spellingShingle | Article Lee, Hwasoo Han, Su Jung Chidambaram Seshadri, Ramachandran Sampath, Sanjay Thermoelectric properties of in-situ plasma spray synthesized sub-stoichiometry TiO(2−x) |
title | Thermoelectric properties of in-situ plasma spray synthesized sub-stoichiometry TiO(2−x) |
title_full | Thermoelectric properties of in-situ plasma spray synthesized sub-stoichiometry TiO(2−x) |
title_fullStr | Thermoelectric properties of in-situ plasma spray synthesized sub-stoichiometry TiO(2−x) |
title_full_unstemmed | Thermoelectric properties of in-situ plasma spray synthesized sub-stoichiometry TiO(2−x) |
title_short | Thermoelectric properties of in-situ plasma spray synthesized sub-stoichiometry TiO(2−x) |
title_sort | thermoelectric properties of in-situ plasma spray synthesized sub-stoichiometry tio(2−x) |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5109908/ https://www.ncbi.nlm.nih.gov/pubmed/27811954 http://dx.doi.org/10.1038/srep36581 |
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