Tracy, Cameron L. ; Lang, Maik ; Zhang, Fuxiang ; Trautmann, Christina ; Ewing, Rodney C. (2015)
Phase transformations inLn2O3materials irradiated with swift heavy ions.
In: Physical Review B, 92 (17)
doi: 10.1103/PhysRevB.92.174101
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Phase transformations induced in the cubic C-type lanthanide sesquioxides, Ln(2)O(3) (Ln = Sm, Gd, Ho, Tm, and Lu), by dense electronic excitation are investigated. The structural modifications resulting from exposure to beams of 185 MeV Xe and 2246 MeV Au ions are characterized using synchrotron x-ray diffraction and Raman spectroscopy. The formation of a B-type polymorph, an X-type nonequilibrium phase, and an amorphous phase are observed. The specific phase formed and the transformation rate show dependence on the material composition, as well as the ion beam mass and energy. Atomistic mechanisms for these transformations are determined, indicating that formation of the B-type phase results from the production of anti-Frenkel defects and the aggregation of anion vacancies into planar clusters, whereas formation of the X-type and amorphous phases requires extensive displacement of both anions and cations. The observed variations in phase behavior with changing lanthanide ionic radius and deposited electronic energy density are related to the energetics of these transformation mechanisms.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2015 |
| Autor(en): | Tracy, Cameron L. ; Lang, Maik ; Zhang, Fuxiang ; Trautmann, Christina ; Ewing, Rodney C. |
| Art des Eintrags: | Bibliographie |
| Titel: | Phase transformations inLn2O3materials irradiated with swift heavy ions |
| Sprache: | Englisch |
| Publikationsjahr: | 3 November 2015 |
| Verlag: | American Physical Society |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Physical Review B |
| Jahrgang/Volume einer Zeitschrift: | 92 |
| (Heft-)Nummer: | 17 |
| DOI: | 10.1103/PhysRevB.92.174101 |
| Kurzbeschreibung (Abstract): | Phase transformations induced in the cubic C-type lanthanide sesquioxides, Ln(2)O(3) (Ln = Sm, Gd, Ho, Tm, and Lu), by dense electronic excitation are investigated. The structural modifications resulting from exposure to beams of 185 MeV Xe and 2246 MeV Au ions are characterized using synchrotron x-ray diffraction and Raman spectroscopy. The formation of a B-type polymorph, an X-type nonequilibrium phase, and an amorphous phase are observed. The specific phase formed and the transformation rate show dependence on the material composition, as well as the ion beam mass and energy. Atomistic mechanisms for these transformations are determined, indicating that formation of the B-type phase results from the production of anti-Frenkel defects and the aggregation of anion vacancies into planar clusters, whereas formation of the X-type and amorphous phases requires extensive displacement of both anions and cations. The observed variations in phase behavior with changing lanthanide ionic radius and deposited electronic energy density are related to the energetics of these transformation mechanisms. |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Ionenstrahlmodifizierte Materialien |
| Hinterlegungsdatum: | 29 Feb 2016 12:41 |
| Letzte Änderung: | 15 Mär 2024 19:05 |
| PPN: | |
| Sponsoren: | This paper was supported by the Energy Frontier Research Center Materials Science of Actinides funded by the U.S. Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences (Grant No. DE-SC0001089)., C.L.T. acknowledges support from the National Science Foundation (NSF) Graduate Research Fellowship Program under Grant No. DGE-1256260., The use of the National Synchrotron Light Source at X17C station is supported by NSF COMPRES Cooperative Agreement Grant No. EAR01-35554 and by U.S. DOE Contract No. DE-AC02-10886. |
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