Shamblin, Jacob ; Tracy, Cameron L. ; Palomares, Raul I. ; O'Quinn, Eric C. ; Ewing, Rodney C. ; Neuefeind, Joerg ; Feygenson, Mikhail ; Behrens, Jason ; Trautmann, Christina ; Lang, Maik (2018)
Similar local order in disordered fluorite and aperiodic pyrochlore structures.
In: Acta Materialia, 144
doi: 10.1016/j.actamat.2017.10.044
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
A major challenge to understanding the response of materials to extreme environments (e.g., nuclear fuels/waste forms and fusion materials) is to unravel the processes by which a material can incorporate atomic-scale disorder, and at the same time, remain crystalline. While it has long been known that all condensed matter, even liquids and glasses, possess short-range order, the relation between fully-ordered, disordered, and aperiodic structures over multiple length scales is not well understood. For example, when defects are introduced (via pressure or irradiation) into materials adopting the pyrochlore structure, these complex oxides either disorder over specific crystallographic sites, remaining crystalline, or become aperiodic. Here we present neutron total scattering results characterizing the irradiation response of two pyrochlores, one that is known to disorder (Er2Sn2O7) and the other to amorphize (Dy2Sn2O7) under ion irradiation. The results demonstrate that in both cases, the local pyrochlore structure is transformed into similar short range configurations that are best fit by the orthorhombic weberite structure, even though the two compositions have distinctly different structures, aperiodic vs. disordered-crystalline, at longer length scales. Thus, a material's resistance to amorphization may not depend primarily on local defect formation energies, but rather on the structure's compatibility with meso-scale modulations of the local order in a way that maintains long-range periodicity.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2018 |
| Autor(en): | Shamblin, Jacob ; Tracy, Cameron L. ; Palomares, Raul I. ; O'Quinn, Eric C. ; Ewing, Rodney C. ; Neuefeind, Joerg ; Feygenson, Mikhail ; Behrens, Jason ; Trautmann, Christina ; Lang, Maik |
| Art des Eintrags: | Bibliographie |
| Titel: | Similar local order in disordered fluorite and aperiodic pyrochlore structures |
| Sprache: | Englisch |
| Publikationsjahr: | 1 Februar 2018 |
| Verlag: | Elsevier Science Publishing |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Acta Materialia |
| Jahrgang/Volume einer Zeitschrift: | 144 |
| DOI: | 10.1016/j.actamat.2017.10.044 |
| URL / URN: | https://doi.org/10.1016/j.actamat.2017.10.044 |
| Kurzbeschreibung (Abstract): | A major challenge to understanding the response of materials to extreme environments (e.g., nuclear fuels/waste forms and fusion materials) is to unravel the processes by which a material can incorporate atomic-scale disorder, and at the same time, remain crystalline. While it has long been known that all condensed matter, even liquids and glasses, possess short-range order, the relation between fully-ordered, disordered, and aperiodic structures over multiple length scales is not well understood. For example, when defects are introduced (via pressure or irradiation) into materials adopting the pyrochlore structure, these complex oxides either disorder over specific crystallographic sites, remaining crystalline, or become aperiodic. Here we present neutron total scattering results characterizing the irradiation response of two pyrochlores, one that is known to disorder (Er2Sn2O7) and the other to amorphize (Dy2Sn2O7) under ion irradiation. The results demonstrate that in both cases, the local pyrochlore structure is transformed into similar short range configurations that are best fit by the orthorhombic weberite structure, even though the two compositions have distinctly different structures, aperiodic vs. disordered-crystalline, at longer length scales. Thus, a material's resistance to amorphization may not depend primarily on local defect formation energies, but rather on the structure's compatibility with meso-scale modulations of the local order in a way that maintains long-range periodicity. |
| 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 12:38 |
| Letzte Änderung: | 29 Dez 2017 12:38 |
| PPN: | |
| Sponsoren: | This work was supported as part of by the Materials Science of Actinides, an Energy Frontier Research Center funded by the US Department of Energy, Office of Science, Basic Energy Sciences under Award # DE-SC0001089., J.S. acknowledges support from an Organized Research Unit from the Office of Research at the University of Tennessee., This research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory., R.I.P. acknowledges support from the US Department of Energy (DOE) National Nuclear Security Administration (NNSA) through the Carnegie DOE Alliance Center (CDAC) under grant number DE-NA-0002006. |
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