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Co-Cr-Fe-Mn-Ni Oxide as a Highly Efficient Thermoelectric High-Entropy Alloy
[Image: see text] Among the existing materials for heat conversion, high-entropy alloys are of great interest due to the tunability of their functional properties. Here, we aim to produce single-phase high-entropy oxides composed of Co-Cr-Fe-Mn-Ni-O through spark plasma sintering (SPS), testing thei...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Chemical Society
2023
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10134248/ https://www.ncbi.nlm.nih.gov/pubmed/37125128 http://dx.doi.org/10.1021/acsomega.2c08278 |
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author | Pankratova, Daria Giacomelli, Silvia Maria Yusupov, Khabib Akhtar, Farid Vomiero, Alberto |
author_facet | Pankratova, Daria Giacomelli, Silvia Maria Yusupov, Khabib Akhtar, Farid Vomiero, Alberto |
author_sort | Pankratova, Daria |
collection | PubMed |
description | [Image: see text] Among the existing materials for heat conversion, high-entropy alloys are of great interest due to the tunability of their functional properties. Here, we aim to produce single-phase high-entropy oxides composed of Co-Cr-Fe-Mn-Ni-O through spark plasma sintering (SPS), testing their thermoelectric (TE) properties. This material was successfully obtained before via a different technique, which requires a very long processing time. Hence, the main target of this work is to apply spark plasma sintering, a much faster and scalable process. The samples were sintered in the temperature range of 1200–1300 °C. Two main phases were formed: rock salt-structured Fm3̅m and spinel-structured Fd3̅m. Comparable transport properties were achieved via the new approach: the highest value of the Seebeck coefficient reached −112.6 μV/K at room temperature, compared to −150 μV/K reported before; electrical properties at high temperatures are close to the properties of the single-phase material (σ = 0.2148 S/cm, σ ≈ 0.2009 S/cm reported before). These results indicate that SPS can be successfully applied to produce highly efficient TE high-entropy alloys in a fast and scalable way. Further optimization is needed for the production of single-phase materials, which are expected to exhibit an even better TE functionality. |
format | Online Article Text |
id | pubmed-10134248 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | American Chemical Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-101342482023-04-28 Co-Cr-Fe-Mn-Ni Oxide as a Highly Efficient Thermoelectric High-Entropy Alloy Pankratova, Daria Giacomelli, Silvia Maria Yusupov, Khabib Akhtar, Farid Vomiero, Alberto ACS Omega [Image: see text] Among the existing materials for heat conversion, high-entropy alloys are of great interest due to the tunability of their functional properties. Here, we aim to produce single-phase high-entropy oxides composed of Co-Cr-Fe-Mn-Ni-O through spark plasma sintering (SPS), testing their thermoelectric (TE) properties. This material was successfully obtained before via a different technique, which requires a very long processing time. Hence, the main target of this work is to apply spark plasma sintering, a much faster and scalable process. The samples were sintered in the temperature range of 1200–1300 °C. Two main phases were formed: rock salt-structured Fm3̅m and spinel-structured Fd3̅m. Comparable transport properties were achieved via the new approach: the highest value of the Seebeck coefficient reached −112.6 μV/K at room temperature, compared to −150 μV/K reported before; electrical properties at high temperatures are close to the properties of the single-phase material (σ = 0.2148 S/cm, σ ≈ 0.2009 S/cm reported before). These results indicate that SPS can be successfully applied to produce highly efficient TE high-entropy alloys in a fast and scalable way. Further optimization is needed for the production of single-phase materials, which are expected to exhibit an even better TE functionality. American Chemical Society 2023-04-14 /pmc/articles/PMC10134248/ /pubmed/37125128 http://dx.doi.org/10.1021/acsomega.2c08278 Text en © 2023 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by/4.0/Permits the broadest form of re-use including for commercial purposes, provided that author attribution and integrity are maintained (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Pankratova, Daria Giacomelli, Silvia Maria Yusupov, Khabib Akhtar, Farid Vomiero, Alberto Co-Cr-Fe-Mn-Ni Oxide as a Highly Efficient Thermoelectric High-Entropy Alloy |
title | Co-Cr-Fe-Mn-Ni
Oxide as a Highly Efficient Thermoelectric
High-Entropy Alloy |
title_full | Co-Cr-Fe-Mn-Ni
Oxide as a Highly Efficient Thermoelectric
High-Entropy Alloy |
title_fullStr | Co-Cr-Fe-Mn-Ni
Oxide as a Highly Efficient Thermoelectric
High-Entropy Alloy |
title_full_unstemmed | Co-Cr-Fe-Mn-Ni
Oxide as a Highly Efficient Thermoelectric
High-Entropy Alloy |
title_short | Co-Cr-Fe-Mn-Ni
Oxide as a Highly Efficient Thermoelectric
High-Entropy Alloy |
title_sort | co-cr-fe-mn-ni
oxide as a highly efficient thermoelectric
high-entropy alloy |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10134248/ https://www.ncbi.nlm.nih.gov/pubmed/37125128 http://dx.doi.org/10.1021/acsomega.2c08278 |
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