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.
Authors with CRIS profile
Neamul Hayet Khansur
Lehrstuhl für Glas und Keramik (WW3)
Kyle Grant Webber
Professur für Werkstoffwissenschaften (Funktionskeramik)
Involved external institutions
Technische Universität Darmstadt
Germany (DE)
Karlsruhe Institute of Technology (KIT)
Germany (DE)
NTNU Trondheim - Norwegian University of Science and Technology
Norway (NO)
University of New South Wales (UNSW)
Australia (AU)
Germany (DE)
Karlsruhe Institute of Technology (KIT)
Germany (DE)
NTNU Trondheim - Norwegian University of Science and Technology
Norway (NO)
University of New South Wales (UNSW)
Australia (AU)
How to cite
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://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.
BibTeX: Download