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Radiation Tolerance of Nanocrystalline Ceramics: Insights from Yttria Stabilized Zirconia
Materials for applications in hostile environments, such as nuclear reactors or radioactive waste immobilization, require extremely high resistance to radiation damage, such as resistance to amorphization or volume swelling. Nanocrystalline materials have been reported to present exceptionally high...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group
2015
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4291567/ https://www.ncbi.nlm.nih.gov/pubmed/25582769 http://dx.doi.org/10.1038/srep07746 |
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author | Dey, Sanchita Drazin, John W. Wang, Yongqiang Valdez, James A. Holesinger, Terry G. Uberuaga, Blas P. Castro, Ricardo H. R. |
author_facet | Dey, Sanchita Drazin, John W. Wang, Yongqiang Valdez, James A. Holesinger, Terry G. Uberuaga, Blas P. Castro, Ricardo H. R. |
author_sort | Dey, Sanchita |
collection | PubMed |
description | Materials for applications in hostile environments, such as nuclear reactors or radioactive waste immobilization, require extremely high resistance to radiation damage, such as resistance to amorphization or volume swelling. Nanocrystalline materials have been reported to present exceptionally high radiation-tolerance to amorphization. In principle, grain boundaries that are prevalent in nanomaterials could act as sinks for point-defects, enhancing defect recombination. In this paper we present evidence for this mechanism in nanograined Yttria Stabilized Zirconia (YSZ), associated with the observation that the concentration of defects after irradiation using heavy ions (Kr(+), 400 keV) is inversely proportional to the grain size. HAADF images suggest the short migration distances in nanograined YSZ allow radiation induced interstitials to reach the grain boundaries on the irradiation time scale, leaving behind only vacancy clusters distributed within the grain. Because of the relatively low temperature of the irradiations and the fact that interstitials diffuse thermally more slowly than vacancies, this result indicates that the interstitials must reach the boundaries directly in the collision cascade, consistent with previous simulation results. Concomitant radiation-induced grain growth was observed which, as a consequence of the non-uniform implantation, caused cracking of the nano-samples induced by local stresses at the irradiated/non-irradiated interfaces. |
format | Online Article Text |
id | pubmed-4291567 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2015 |
publisher | Nature Publishing Group |
record_format | MEDLINE/PubMed |
spelling | pubmed-42915672015-01-16 Radiation Tolerance of Nanocrystalline Ceramics: Insights from Yttria Stabilized Zirconia Dey, Sanchita Drazin, John W. Wang, Yongqiang Valdez, James A. Holesinger, Terry G. Uberuaga, Blas P. Castro, Ricardo H. R. Sci Rep Article Materials for applications in hostile environments, such as nuclear reactors or radioactive waste immobilization, require extremely high resistance to radiation damage, such as resistance to amorphization or volume swelling. Nanocrystalline materials have been reported to present exceptionally high radiation-tolerance to amorphization. In principle, grain boundaries that are prevalent in nanomaterials could act as sinks for point-defects, enhancing defect recombination. In this paper we present evidence for this mechanism in nanograined Yttria Stabilized Zirconia (YSZ), associated with the observation that the concentration of defects after irradiation using heavy ions (Kr(+), 400 keV) is inversely proportional to the grain size. HAADF images suggest the short migration distances in nanograined YSZ allow radiation induced interstitials to reach the grain boundaries on the irradiation time scale, leaving behind only vacancy clusters distributed within the grain. Because of the relatively low temperature of the irradiations and the fact that interstitials diffuse thermally more slowly than vacancies, this result indicates that the interstitials must reach the boundaries directly in the collision cascade, consistent with previous simulation results. Concomitant radiation-induced grain growth was observed which, as a consequence of the non-uniform implantation, caused cracking of the nano-samples induced by local stresses at the irradiated/non-irradiated interfaces. Nature Publishing Group 2015-01-13 /pmc/articles/PMC4291567/ /pubmed/25582769 http://dx.doi.org/10.1038/srep07746 Text en Copyright © 2015, Macmillan Publishers Limited. All rights reserved http://creativecommons.org/licenses/by-nc-nd/4.0/ This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 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 in order to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/4.0/ |
spellingShingle | Article Dey, Sanchita Drazin, John W. Wang, Yongqiang Valdez, James A. Holesinger, Terry G. Uberuaga, Blas P. Castro, Ricardo H. R. Radiation Tolerance of Nanocrystalline Ceramics: Insights from Yttria Stabilized Zirconia |
title | Radiation Tolerance of Nanocrystalline Ceramics: Insights from Yttria Stabilized Zirconia |
title_full | Radiation Tolerance of Nanocrystalline Ceramics: Insights from Yttria Stabilized Zirconia |
title_fullStr | Radiation Tolerance of Nanocrystalline Ceramics: Insights from Yttria Stabilized Zirconia |
title_full_unstemmed | Radiation Tolerance of Nanocrystalline Ceramics: Insights from Yttria Stabilized Zirconia |
title_short | Radiation Tolerance of Nanocrystalline Ceramics: Insights from Yttria Stabilized Zirconia |
title_sort | radiation tolerance of nanocrystalline ceramics: insights from yttria stabilized zirconia |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4291567/ https://www.ncbi.nlm.nih.gov/pubmed/25582769 http://dx.doi.org/10.1038/srep07746 |
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