Park, Sulgiye ; Lang, Maik ; Tracy, Cameron L. ; Zhang, Jiaming ; Zhang, Fuxiang ; Trautmann, Christina ; Kluth, Patrick ; Rodriguez, Matias D. ; Ewing, Rodney C. (2014)
Swift heavy ion irradiation-induced amorphization of La2Ti2O7.
In: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 326
doi: 10.1016/j.nimb.2013.10.088
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Polycrystalline La2Ti2O7 powders have been irradiated with 2.0 GeV 181Ta ions up to a fluence of 1 × 1013 ions/cm2. Radiation-induced structural modifications were analyzed using synchrotron-based X-ray diffraction (XRD), small angle X-ray scattering (SAXS), Raman spectroscopy and transmission electron microscopy (TEM). An increase in the amorphous fraction as a function of fluence was revealed by XRD and Raman analyses and is evidenced by the reduction in intensity of the sharp Bragg maxima from the crystalline regions. Concurrently, diffraction maxima and vibrational absorption bands broaden with the increasing amorphous fraction. The cross-section for the crystalline-to-amorphous transformation (ion tracks) was determined by quantitative analysis of XRD patterns yielding a track diameter of d = 7.2 ± 0.9 nm. Slightly larger track diameters were obtained directly from TEM images (d = 10.6 ± 0.8 nm) and SAXS analysis (d = 10.6 ± 0.3 nm). High-resolution TEM images revealed that single tracks are entirely amorphous without any outer crystalline, disordered shell as found in pyrochlore oxides of the same stoichiometry. The large ratio of ionic radii of the A- and B-site cations (rA/rB = 1.94) means that disordering over the A- and B-sites is energetically unfavorable.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2014 |
| Autor(en): | Park, Sulgiye ; Lang, Maik ; Tracy, Cameron L. ; Zhang, Jiaming ; Zhang, Fuxiang ; Trautmann, Christina ; Kluth, Patrick ; Rodriguez, Matias D. ; Ewing, Rodney C. |
| Art des Eintrags: | Bibliographie |
| Titel: | Swift heavy ion irradiation-induced amorphization of La2Ti2O7 |
| Sprache: | Englisch |
| Publikationsjahr: | 1 Mai 2014 |
| Verlag: | Elsevier Science Publishing |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms |
| Jahrgang/Volume einer Zeitschrift: | 326 |
| DOI: | 10.1016/j.nimb.2013.10.088 |
| Kurzbeschreibung (Abstract): | Polycrystalline La2Ti2O7 powders have been irradiated with 2.0 GeV 181Ta ions up to a fluence of 1 × 1013 ions/cm2. Radiation-induced structural modifications were analyzed using synchrotron-based X-ray diffraction (XRD), small angle X-ray scattering (SAXS), Raman spectroscopy and transmission electron microscopy (TEM). An increase in the amorphous fraction as a function of fluence was revealed by XRD and Raman analyses and is evidenced by the reduction in intensity of the sharp Bragg maxima from the crystalline regions. Concurrently, diffraction maxima and vibrational absorption bands broaden with the increasing amorphous fraction. The cross-section for the crystalline-to-amorphous transformation (ion tracks) was determined by quantitative analysis of XRD patterns yielding a track diameter of d = 7.2 ± 0.9 nm. Slightly larger track diameters were obtained directly from TEM images (d = 10.6 ± 0.8 nm) and SAXS analysis (d = 10.6 ± 0.3 nm). High-resolution TEM images revealed that single tracks are entirely amorphous without any outer crystalline, disordered shell as found in pyrochlore oxides of the same stoichiometry. The large ratio of ionic radii of the A- and B-site cations (rA/rB = 1.94) means that disordering over the A- and B-sites is energetically unfavorable. |
| Freie Schlagworte: | Swift heavy ion irradiation, La2Ti2O7, Pyrochlore, Perovskite |
| Zusätzliche Informationen: | 17th International Conference on Radiation Effects in Insulators (REI) |
| 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: | 12 Jan 2015 12:38 |
| Letzte Änderung: | 12 Jan 2015 12:38 |
| PPN: | |
| Sponsoren: | This work was supported by the Center for the Materials Science of Actinides, an Energy Frontier Research Center, funded by the U.S. Department of Energy, Office of Basic Energy Sciences (DE-SC0001089). , The use of CHESS beam is supported by NSF & NIH/NIGMS via NSF award DMR-0225180., TEM instrumentation at the Electron Micro-beam Analysis Laboratory at the University of Michigan is supported by NSF Grants DMR-987177 and DMR-0723032., P.K. acknowledges the Australian Research Council for financial support. |
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