Gupta, Ashish Kumar ; Zarkadoula, Eva ; Ziatdinov, Maxim ; Kalinin, Sergei V. ; Paduri, Vikas Reddy ; Hachtel, Jordan A. ; Zhang, Yanwen ; Trautmann, Christina ; Weber, William J. ; Sachan, Ritesh (2024)
Nanoscale core–shell structure and recrystallization of swift heavy ion tracks in SrTiO₃.
In: Nanoscale, 16 (30)
doi: 10.1039/d4nr01974a
Artikel, Bibliographie

Kurzbeschreibung (Abstract)

It is widely accepted that the interaction of swift heavy ions with many complex oxides is predominantly governed by the electronic energy loss that gives rise to nanoscale amorphous ion tracks along the penetration direction. The question of how electronic excitation and electron–phonon coupling affect the atomic system through defect production, recrystallization, and strain effects has not yet been fully clarified. To advance the knowledge of the atomic structure of ion tracks, we irradiated single crystalline SrTiO₃ with 629 MeV Xe ions and performed comprehensive electron microscopy investigations complemented by molecular dynamics simulations. This study shows discontinuous ion-track formation along the ion penetration path, comprising an amorphous core and a surrounding few monolayer thick shell of strained/defective crystalline SrTiO₃. Using machine-learning-aided analysis of atomic-scale images, we demonstrate the presence of 4–8% strain in the disordered region interfacing with the amorphous core in the initially formed ion tracks. Under constant exposure of the electron beam during imaging, the amorphous part of the ion tracks readily recrystallizes radially inwards from the crystalline-amorphous interface under the constant electron-beam irradiation during the imaging. Cation strain in the amorphous region is observed to be significantly recovered, while the oxygen sublattice remains strained even under the electron irradiation due to the present oxygen vacancies. The molecular dynamics simulations support this observation and suggest that local transient heating and annealing facilitate recrystallization process of the amorphous phase and drive Sr and Ti sublattices to rearrange. In contrast, the annealing of O atoms is difficult, thus leaving a remnant of oxygen vacancies and strain even after recrystallization. This work provides insights for creating and transforming novel interfaces and nanostructures for future functional applications.

Typ des Eintrags:	Artikel
Erschienen:	2024
Autor(en):	Gupta, Ashish Kumar ; Zarkadoula, Eva ; Ziatdinov, Maxim ; Kalinin, Sergei V. ; Paduri, Vikas Reddy ; Hachtel, Jordan A. ; Zhang, Yanwen ; Trautmann, Christina ; Weber, William J. ; Sachan, Ritesh
Art des Eintrags:	Bibliographie
Titel:	Nanoscale core–shell structure and recrystallization of swift heavy ion tracks in SrTiO₃
Sprache:	Englisch
Publikationsjahr:	1 Juli 2024
Ort:	Cambridge
Verlag:	The Royal Society of Chemistry
Titel der Zeitschrift, Zeitung oder Schriftenreihe:	Nanoscale
Jahrgang/Volume einer Zeitschrift:	16
(Heft-)Nummer:	30
DOI:	10.1039/d4nr01974a
Zugehörige Links:	TUprints Zweitveröffentlichung
Kurzbeschreibung (Abstract):	It is widely accepted that the interaction of swift heavy ions with many complex oxides is predominantly governed by the electronic energy loss that gives rise to nanoscale amorphous ion tracks along the penetration direction. The question of how electronic excitation and electron–phonon coupling affect the atomic system through defect production, recrystallization, and strain effects has not yet been fully clarified. To advance the knowledge of the atomic structure of ion tracks, we irradiated single crystalline SrTiO₃ with 629 MeV Xe ions and performed comprehensive electron microscopy investigations complemented by molecular dynamics simulations. This study shows discontinuous ion-track formation along the ion penetration path, comprising an amorphous core and a surrounding few monolayer thick shell of strained/defective crystalline SrTiO₃. Using machine-learning-aided analysis of atomic-scale images, we demonstrate the presence of 4–8% strain in the disordered region interfacing with the amorphous core in the initially formed ion tracks. Under constant exposure of the electron beam during imaging, the amorphous part of the ion tracks readily recrystallizes radially inwards from the crystalline-amorphous interface under the constant electron-beam irradiation during the imaging. Cation strain in the amorphous region is observed to be significantly recovered, while the oxygen sublattice remains strained even under the electron irradiation due to the present oxygen vacancies. The molecular dynamics simulations support this observation and suggest that local transient heating and annealing facilitate recrystallization process of the amorphous phase and drive Sr and Ti sublattices to rearrange. In contrast, the annealing of O atoms is difficult, thus leaving a remnant of oxygen vacancies and strain even after recrystallization. This work provides insights for creating and transforming novel interfaces and nanostructures for future functional applications.
Sachgruppe der Dewey Dezimalklassifikatin (DDC):	500 Naturwissenschaften und Mathematik > 530 Physik 500 Naturwissenschaften und Mathematik > 540 Chemie
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:	04 Okt 2024 07:10
Letzte Änderung:	17 Okt 2024 09:25
PPN:	522291562
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• Nanoscale core–shell structure and recrystallization of swift heavy ion tracks in SrTiO₃. (deposited 30 Sep 2024 12:28)
  • Nanoscale core–shell structure and recrystallization of swift heavy ion tracks in SrTiO₃. (deposited 04 Okt 2024 07:10) [Gegenwärtig angezeigt]

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