Palomares, Raul I. ; Shamblin, Jacob ; Tracy, Cameron L. ; Neuefeind, Joerg ; Ewing, Rodney C. ; Trautmann, Christina ; Lang, Maik (2017)
Defect accumulation in swift heavy ion-irradiated CeO2 and ThO2.
In: Journal of Materials Chemistry A, 5 (24)
doi: 10.1039/C7TA02640D
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Neutron total scattering was used to investigate defect accumulation mechanisms in CeO2 and ThO2 irradiated with 2.2 GeV Au ions. Pair distribution function (PDF) analysis was applied to characterize the local structural evolution and irradiation-induced defects as a function of irradiation fluence. CeO2 exhibits a greater amount of disorder than ThO2 under the same irradiation conditions. The local structures of the two materials evolve differently as a function of ion fluence, even if similar defects are produced. The PDF analysis indicates that oxygen dimer and/or peroxide defects with 〈O–O〉 distances of ∼1.45 Å are formed in CeO2, while irradiation-induced defects in ThO2 result in a change in the mean O–Th–O bond angle and a distortion of local ThO8 polyhedra. Understanding how bound oxygen defects, such as peroxide, affect bulk oxygen transport in CeO2 will aid in better predicting and improving properties of fluorite structure materials for fast ion conductor applications.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2017 |
| Autor(en): | Palomares, Raul I. ; Shamblin, Jacob ; Tracy, Cameron L. ; Neuefeind, Joerg ; Ewing, Rodney C. ; Trautmann, Christina ; Lang, Maik |
| Art des Eintrags: | Bibliographie |
| Titel: | Defect accumulation in swift heavy ion-irradiated CeO2 and ThO2 |
| Sprache: | Englisch |
| Publikationsjahr: | 30 Mai 2017 |
| Verlag: | Royal Society of Chemistry |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of Materials Chemistry A |
| Jahrgang/Volume einer Zeitschrift: | 5 |
| (Heft-)Nummer: | 24 |
| DOI: | 10.1039/C7TA02640D |
| URL / URN: | https://doi.org/10.1039/C7TA02640D |
| Kurzbeschreibung (Abstract): | Neutron total scattering was used to investigate defect accumulation mechanisms in CeO2 and ThO2 irradiated with 2.2 GeV Au ions. Pair distribution function (PDF) analysis was applied to characterize the local structural evolution and irradiation-induced defects as a function of irradiation fluence. CeO2 exhibits a greater amount of disorder than ThO2 under the same irradiation conditions. The local structures of the two materials evolve differently as a function of ion fluence, even if similar defects are produced. The PDF analysis indicates that oxygen dimer and/or peroxide defects with 〈O–O〉 distances of ∼1.45 Å are formed in CeO2, while irradiation-induced defects in ThO2 result in a change in the mean O–Th–O bond angle and a distortion of local ThO8 polyhedra. Understanding how bound oxygen defects, such as peroxide, affect bulk oxygen transport in CeO2 will aid in better predicting and improving properties of fluorite structure materials for fast ion conductor applications. |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Ionenstrahlmodifizierte Materialien 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 29 Dez 2017 12:16 |
| Letzte Änderung: | 29 Dez 2017 12:16 |
| PPN: | |
| Sponsoren: | This research is funded by the Office of Basic Energy Sciences of the U.S. Department of Energy as part of the Materials Science of Actinides Energy Frontier Research Center (DE-SC0001089)., The research at ORNL's Spallation Neutron Source was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, US Department of Energy., HPCAT operations are supported by DOE-NNSA under Award No. DE-NA0001974 and DOE-BES under Award No. De-FG02-99ER45775, with partial instrumentation funding by NSF., R.I.P.gratefully acknowledges support from the U.S. Department of Energy (DOE) National Nuclear Security Administration (NNSA) through the Carnegie DOE Alliance Center (CDAC) under grant number DE-NA-0002006. |
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