Tracy, Cameron L. ; Lang, Maik ; Severin, Daniel ; Bender, Markus ; Trautmann, Christina ; Ewing, Rodney C. (2016)
Anisotropic expansion and amorphization of Ga 2 O 3 irradiated with 946 MeV Au ions.
In: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 374
doi: 10.1016/j.nimb.2015.08.059
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
The structural response of β-Ga2O3 to irradiation-induced electronic excitation was investigated. A polycrystalline pellet of this material was irradiated with 946 MeV Au ions and the resulting structural modifications were characterized using in situ X-ray diffraction analysis at various ion fluences, up to 1 × 1013 cm−2. Amorphization was induced, with the accumulation of the amorphous phase following a single-impact mechanism in which each ion produces an amorphous ion track along its path. Concurrent with this phase transformation, an increase in the unit cell volume of the material was observed and quantified using Rietveld refinement. This unit cell expansion increased as a function of ion fluence before saturating at 1.8%. This effect is attributed to the generation of defects in an ion track shell region surrounding the amorphous track cores. The unit cell parameter increase was highly anisotropic, with no observed expansion in the [0 1 0] direction. This may be due to the structure of β-Ga2O3, which exhibits empty channels of connected interstitial sites oriented in this direction.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2016 |
| Autor(en): | Tracy, Cameron L. ; Lang, Maik ; Severin, Daniel ; Bender, Markus ; Trautmann, Christina ; Ewing, Rodney C. |
| Art des Eintrags: | Bibliographie |
| Titel: | Anisotropic expansion and amorphization of Ga 2 O 3 irradiated with 946 MeV Au ions |
| Sprache: | Englisch |
| Publikationsjahr: | 1 Mai 2016 |
| 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: | 374 |
| DOI: | 10.1016/j.nimb.2015.08.059 |
| URL / URN: | https://doi.org/10.1016/j.nimb.2015.08.059 |
| Kurzbeschreibung (Abstract): | The structural response of β-Ga2O3 to irradiation-induced electronic excitation was investigated. A polycrystalline pellet of this material was irradiated with 946 MeV Au ions and the resulting structural modifications were characterized using in situ X-ray diffraction analysis at various ion fluences, up to 1 × 1013 cm−2. Amorphization was induced, with the accumulation of the amorphous phase following a single-impact mechanism in which each ion produces an amorphous ion track along its path. Concurrent with this phase transformation, an increase in the unit cell volume of the material was observed and quantified using Rietveld refinement. This unit cell expansion increased as a function of ion fluence before saturating at 1.8%. This effect is attributed to the generation of defects in an ion track shell region surrounding the amorphous track cores. The unit cell parameter increase was highly anisotropic, with no observed expansion in the [0 1 0] direction. This may be due to the structure of β-Ga2O3, which exhibits empty channels of connected interstitial sites oriented in this direction. |
| Freie Schlagworte: | Swift heavy Ions, Ion irradiation, X-ray diffraction, Amorphization, Unit cell parameters |
| 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 09:40 |
| Letzte Änderung: | 29 Dez 2017 09:40 |
| PPN: | |
| Sponsoren: | This work was supported by the Energy Frontier Research Center Materials Science of Actinides funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences (DE-SC0001089)., C.L.T. acknowledges support from the National Science Foundation Graduate Research Fellowship Program under Grant Number DGE-1256260. |
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