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Nonlinear mechanical behaviour of Ba0.5Sr0.5Co0.8Fe0.2O3−δ and in situ stress dependent synchrotron X-ray diffraction study

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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