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

Geiger PT, Clemens O, Khansur NH, Hinterstein M, Sahini MG, Grande T, Tung P, Daniels JE, Webber KG (2017)


Publication Language: English

Publication Status: Published

Publication Type: Journal article, Original article

Publication year: 2017

Journal

Publisher: ELSEVIER SCIENCE BV

Book Volume: 300

Pages Range: 106-113

DOI: 10.1016/j.ssi.2016.11.027

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.

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APA:

Geiger, P.T., Clemens, O., Khansur, N.H., Hinterstein, M., Sahini, M.G., Grande, T.,... Webber, K.G. (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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