Zhang, F. X. ; Xi, J. ; Zhang, Y. ; Tong, Yang ; Xue, H. ; Huang, R. ; Trautmann, C. ; Weber, W. J. (2018)
Local structure and defects in ion irradiated KTaO3.
In: Journal of Physics: Condensed Matter, 30 (14)
doi: 10.1088/1361-648X/aab1a2
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
The modification of the local structure in cubic perovskite KTaO3 irradiated with 3 MeV and 1.1 GeV Au ions is studied by Raman and x-ray absorption spectroscopy, complemented by density functional theory (DFT) calculations. In the case of irradiation with 3 MeV Au ions where displacement cascade processes are dominant, the Ta L-3-edge x-ray absorption measurements suggest that a peak corresponding to the Ta-O bonds in the TaO6 octahedra splits, which is attributed to the formation of TaK antisite defects that are coupled with oxygen vacancies, VO. This finding is consistent with the DFT calculations. Under irradiation with 1.1 GeV ions, the intense ionization and electronic energy deposition lead to a blue shift and an intensity reduction of active Raman bands. In the case of sequential irradiations, extended x-ray absorption fine structure measurements reveal a decrease in concentration of coupled TaK-VO defects under subsequent irradiation with 1.1 GeV Au ions.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2018 |
| Autor(en): | Zhang, F. X. ; Xi, J. ; Zhang, Y. ; Tong, Yang ; Xue, H. ; Huang, R. ; Trautmann, C. ; Weber, W. J. |
| Art des Eintrags: | Bibliographie |
| Titel: | Local structure and defects in ion irradiated KTaO3 |
| Sprache: | Englisch |
| Publikationsjahr: | 11 April 2018 |
| Verlag: | IOP Publishing |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of Physics: Condensed Matter |
| Jahrgang/Volume einer Zeitschrift: | 30 |
| (Heft-)Nummer: | 14 |
| DOI: | 10.1088/1361-648X/aab1a2 |
| Kurzbeschreibung (Abstract): | The modification of the local structure in cubic perovskite KTaO3 irradiated with 3 MeV and 1.1 GeV Au ions is studied by Raman and x-ray absorption spectroscopy, complemented by density functional theory (DFT) calculations. In the case of irradiation with 3 MeV Au ions where displacement cascade processes are dominant, the Ta L-3-edge x-ray absorption measurements suggest that a peak corresponding to the Ta-O bonds in the TaO6 octahedra splits, which is attributed to the formation of TaK antisite defects that are coupled with oxygen vacancies, VO. This finding is consistent with the DFT calculations. Under irradiation with 1.1 GeV ions, the intense ionization and electronic energy deposition lead to a blue shift and an intensity reduction of active Raman bands. In the case of sequential irradiations, extended x-ray absorption fine structure measurements reveal a decrease in concentration of coupled TaK-VO defects under subsequent irradiation with 1.1 GeV Au ions. |
| Freie Schlagworte: | KTaO3, ion irradiation, Raman, EXAFS, defects, DFT |
| Zusätzliche Informationen: | Artikel-ID: 145401 |
| 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: | 07 Mär 2024 07:34 |
| Letzte Änderung: | 07 Mär 2024 07:34 |
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