Journal article


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


Publication Details
Author(s): Geiger PT, Clemens O, Khansur NH, Hinterstein M, Sahini MG, Grande T, Tung P, Daniels JE, Webber K
Publisher: ELSEVIER SCIENCE BV
Publication year: 2017
Volume: 300
Pages range: 106-113
ISSN: 0167-2738
Language: English

Abstract

Perovskite type Ba0.5Sr0.5Co0.8Fe0.2O3 (- delta) 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. (C) 2016 Elsevier B.V. All rights reserved.



How to cite
APA: Geiger, P.T., Clemens, O., Khansur, N.H., Hinterstein, M., Sahini, M.G., Grande, T.,... Webber, K. (2017). Nonlinear mechanical behaviour of Ba0.5Sr0.5Co0.8Fe0.2O3 (- delta) and in situ stress dependent synchrotron X-ray diffraction study. Solid State Ionics, 300, 106-113. https://dx.doi.org/10.1016/j.ssi.2016.11.027

MLA: Geiger, Philipp T., et al. "Nonlinear mechanical behaviour of Ba0.5Sr0.5Co0.8Fe0.2O3 (- delta) and in situ stress dependent synchrotron X-ray diffraction study." Solid State Ionics 300 (2017): 106-113.

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