Tracy, Cameron L. ; Shamblin, Jacob ; Park, Sulgiye ; Zhang, Fuxiang ; Trautmann, Christina ; Lang, Maik ; Ewing, Rodney C. (2016)
Role of composition, bond covalency, and short-range order in the disordering of stannate pyrochlores by swift heavy ion irradiation.
In: Physical Review B, 94 (6)
doi: 10.1103/PhysRevB.94.064102
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
A2Sn2O7 (A=Nd,Sm,Gd,Er,Yb,and Y) materials with the pyrochlore structure were irradiated with 2.2 GeV Au ions to systematically investigate disordering of this system in response to dense electronic excitation. Structural modifications were characterized, over multiple length scales, by transmission electron microscopy, x-ray diffraction, and Raman spectroscopy. Transformations to amorphous and disordered phases were observed, with disordering dominating the structural response of materials with small A-site cation ionic radii. Both the disordered and amorphous phases were found to possess weberite-type local ordering, differing only in that the disordered phase exhibits a long-range, modulated arrangement of weberite-type structural units into an average defect-fluorite structure, while the amorphous phase remains fully aperiodic. Comparison with the behavior of titanate and zirconate pyrochlores showed minimal influence of the high covalency of the Sn-O bond on this phase behavior. An analytical model of damage accumulation was developed to account for simultaneous amorphization and recrystallization of the disordered phase during irradiation.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2016 |
| Autor(en): | Tracy, Cameron L. ; Shamblin, Jacob ; Park, Sulgiye ; Zhang, Fuxiang ; Trautmann, Christina ; Lang, Maik ; Ewing, Rodney C. |
| Art des Eintrags: | Bibliographie |
| Titel: | Role of composition, bond covalency, and short-range order in the disordering of stannate pyrochlores by swift heavy ion irradiation |
| Sprache: | Englisch |
| Publikationsjahr: | 3 August 2016 |
| Verlag: | American Physical Society |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Physical Review B |
| Jahrgang/Volume einer Zeitschrift: | 94 |
| (Heft-)Nummer: | 6 |
| DOI: | 10.1103/PhysRevB.94.064102 |
| Kurzbeschreibung (Abstract): | A2Sn2O7 (A=Nd,Sm,Gd,Er,Yb,and Y) materials with the pyrochlore structure were irradiated with 2.2 GeV Au ions to systematically investigate disordering of this system in response to dense electronic excitation. Structural modifications were characterized, over multiple length scales, by transmission electron microscopy, x-ray diffraction, and Raman spectroscopy. Transformations to amorphous and disordered phases were observed, with disordering dominating the structural response of materials with small A-site cation ionic radii. Both the disordered and amorphous phases were found to possess weberite-type local ordering, differing only in that the disordered phase exhibits a long-range, modulated arrangement of weberite-type structural units into an average defect-fluorite structure, while the amorphous phase remains fully aperiodic. Comparison with the behavior of titanate and zirconate pyrochlores showed minimal influence of the high covalency of the Sn-O bond on this phase behavior. An analytical model of damage accumulation was developed to account for simultaneous amorphization and recrystallization of the disordered phase during irradiation. |
| Zusätzliche Informationen: | Artikel-ID: 064102 |
| 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: | 11 Mär 2024 13:34 |
| Letzte Änderung: | 11 Mär 2024 13:34 |
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