Geiger, Philipp T. ; Clemens, Oliver ; Khansur, Neamul H. ; Hinterstein, Manuel ; Sahini, Mtabazi G. ; Grande, Tor ; Tung, Patrick ; Daniels, John E. ; Webber, Kyle G. (2017)
Nonlinear mechanical behaviour of Ba0.5Sr0.5Co0.8Fe0.2O3−δ and in situ stress dependent synchrotron X-ray diffraction study.
In: Solid State Ionics, 300
doi: 10.1016/j.ssi.2016.11.027
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Perovskite type Ba0.5Sr0.5Co0.8Fe0.2O3 − δ ceramics display nonlinear stress-strain behaviour upon uniaxial compression at room temperature. Step functional loading experiments show that the nonlinear strain response of the material is time dependent, partially reversible and depends on the oxygen vacancy concentration. In situ compressive stress-dependent synchrotron X-ray diffraction reveals that the nonlinearity is not related to ferroelasticity or a stress-induced phase transformation. The oxygen vacancy concentration and average spin state were determined from Rietveld analysis of the magnetic scattering found in the neutron powder diffraction data, indicating their role during mechanical loading. An oxygen vacancy migration model and a spin-state transition are proposed as possible mechanisms of nonlinear mechanical response.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2017 |
| Autor(en): | Geiger, Philipp T. ; Clemens, Oliver ; Khansur, Neamul H. ; Hinterstein, Manuel ; Sahini, Mtabazi G. ; Grande, Tor ; Tung, Patrick ; Daniels, John E. ; Webber, Kyle G. |
| Art des Eintrags: | Bibliographie |
| Titel: | Nonlinear mechanical behaviour of Ba0.5Sr0.5Co0.8Fe0.2O3−δ and in situ stress dependent synchrotron X-ray diffraction study |
| Sprache: | Englisch |
| Publikationsjahr: | Februar 2017 |
| Verlag: | Elsevier |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Solid State Ionics |
| Jahrgang/Volume einer Zeitschrift: | 300 |
| DOI: | 10.1016/j.ssi.2016.11.027 |
| URL / URN: | https://doi.org/10.1016/j.ssi.2016.11.027 |
| Kurzbeschreibung (Abstract): | Perovskite type Ba0.5Sr0.5Co0.8Fe0.2O3 − δ ceramics display nonlinear stress-strain behaviour upon uniaxial compression at room temperature. Step functional loading experiments show that the nonlinear strain response of the material is time dependent, partially reversible and depends on the oxygen vacancy concentration. In situ compressive stress-dependent synchrotron X-ray diffraction reveals that the nonlinearity is not related to ferroelasticity or a stress-induced phase transformation. The oxygen vacancy concentration and average spin state were determined from Rietveld analysis of the magnetic scattering found in the neutron powder diffraction data, indicating their role during mechanical loading. An oxygen vacancy migration model and a spin-state transition are proposed as possible mechanisms of nonlinear mechanical response. |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Materialdesign durch Synthese 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Gemeinschaftslabor Nanomaterialien |
| Hinterlegungsdatum: | 22 Mär 2017 10:05 |
| Letzte Änderung: | 29 Jan 2019 07:48 |
| PPN: | |
| Sponsoren: | This project was funded by the Deutsche Forschungsgemeinschaft under WE 4972/2-1 and benefited from the support of CL551/2-1 and HI 1867/1-1. |
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