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Laser Heating Study of the High-Temperature Interactions in Nanograined Uranium Carbides
Nanograined nuclear materials are expected to have a better performance as spallation targets and nuclear fuels than conventional materials, but many basic properties of these materials are still unknown. The present work aims to contribute to their better understanding by studying the effect of gra...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8509787/ https://www.ncbi.nlm.nih.gov/pubmed/34639964 http://dx.doi.org/10.3390/ma14195568 |
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author | Chowdhury, Sanjib Manara, Dario Dieste-Blanco, Oliver Robba, Davide Gonçalves, António Pereira |
author_facet | Chowdhury, Sanjib Manara, Dario Dieste-Blanco, Oliver Robba, Davide Gonçalves, António Pereira |
author_sort | Chowdhury, Sanjib |
collection | PubMed |
description | Nanograined nuclear materials are expected to have a better performance as spallation targets and nuclear fuels than conventional materials, but many basic properties of these materials are still unknown. The present work aims to contribute to their better understanding by studying the effect of grain size on the melting and solid–solid transitions of nanograined UC(2−y). We laser-heated 4 nm–10 nm grain size samples with UC(2−y) as the main phase (but containing graphite and UO(2) as impurities) under inert gas to temperatures above 3000 K, and their behavior was studied by thermal radiance spectroscopy. The UC(2−y) solidification point (2713(30) K) and α-UC(2) to β-UC(2) solid–solid transition temperature (2038(10) K) were observed to remain unchanged when compared to bulk crystalline materials with micrometer grain sizes. After melting, the composite grain size persisted at the nanoscale, from around 10 nm to 20 nm, pointing to an effective role of carbon in preventing the rapid diffusion of uranium and grain growth. |
format | Online Article Text |
id | pubmed-8509787 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-85097872021-10-13 Laser Heating Study of the High-Temperature Interactions in Nanograined Uranium Carbides Chowdhury, Sanjib Manara, Dario Dieste-Blanco, Oliver Robba, Davide Gonçalves, António Pereira Materials (Basel) Article Nanograined nuclear materials are expected to have a better performance as spallation targets and nuclear fuels than conventional materials, but many basic properties of these materials are still unknown. The present work aims to contribute to their better understanding by studying the effect of grain size on the melting and solid–solid transitions of nanograined UC(2−y). We laser-heated 4 nm–10 nm grain size samples with UC(2−y) as the main phase (but containing graphite and UO(2) as impurities) under inert gas to temperatures above 3000 K, and their behavior was studied by thermal radiance spectroscopy. The UC(2−y) solidification point (2713(30) K) and α-UC(2) to β-UC(2) solid–solid transition temperature (2038(10) K) were observed to remain unchanged when compared to bulk crystalline materials with micrometer grain sizes. After melting, the composite grain size persisted at the nanoscale, from around 10 nm to 20 nm, pointing to an effective role of carbon in preventing the rapid diffusion of uranium and grain growth. MDPI 2021-09-25 /pmc/articles/PMC8509787/ /pubmed/34639964 http://dx.doi.org/10.3390/ma14195568 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Chowdhury, Sanjib Manara, Dario Dieste-Blanco, Oliver Robba, Davide Gonçalves, António Pereira Laser Heating Study of the High-Temperature Interactions in Nanograined Uranium Carbides |
title | Laser Heating Study of the High-Temperature Interactions in Nanograined Uranium Carbides |
title_full | Laser Heating Study of the High-Temperature Interactions in Nanograined Uranium Carbides |
title_fullStr | Laser Heating Study of the High-Temperature Interactions in Nanograined Uranium Carbides |
title_full_unstemmed | Laser Heating Study of the High-Temperature Interactions in Nanograined Uranium Carbides |
title_short | Laser Heating Study of the High-Temperature Interactions in Nanograined Uranium Carbides |
title_sort | laser heating study of the high-temperature interactions in nanograined uranium carbides |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8509787/ https://www.ncbi.nlm.nih.gov/pubmed/34639964 http://dx.doi.org/10.3390/ma14195568 |
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