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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. and Clemens, Oliver and Khansur, Neamul H. and Hinterstein, Manuel and Sahini, Mtabazi G. and Grande, Tor and Tung, Patrick and Daniels, John E. and Webber, Kyle G. (2017):
Nonlinear mechanical behaviour of Ba0.5Sr0.5Co0.8Fe0.2O3−δ and in situ stress dependent synchrotron X-ray diffraction study.
300, In: Solid State Ionics, Elsevier, pp. 106-113, ISSN 01672738, DOI: 10.1016/j.ssi.2016.11.027,
[Online-Edition: https://doi.org/10.1016/j.ssi.2016.11.027],
[Article]

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.

Item Type: Article
Erschienen: 2017
Creators: Geiger, Philipp T. and Clemens, Oliver and Khansur, Neamul H. and Hinterstein, Manuel and Sahini, Mtabazi G. and Grande, Tor and Tung, Patrick and Daniels, John E. and Webber, Kyle G.
Title: Nonlinear mechanical behaviour of Ba0.5Sr0.5Co0.8Fe0.2O3−δ and in situ stress dependent synchrotron X-ray diffraction study
Language: English
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.

Journal or Publication Title: Solid State Ionics
Volume: 300
Publisher: Elsevier
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Fachgebiet Materialdesign durch Synthese
11 Department of Materials and Earth Sciences > Material Science > Joint Research Laboratory Nanomaterials
Date Deposited: 22 Mar 2017 10:05
DOI: 10.1016/j.ssi.2016.11.027
Official URL: https://doi.org/10.1016/j.ssi.2016.11.027
Funders: 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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