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

Beitrag in einer Fachzeitschrift
(Originalarbeit)


Details zur Publikation

Autor(en): Geiger PT, Clemens O, Khansur NH, Hinterstein M, Sahini MG, Grande T, Tung P, Daniels JE, Webber K
Zeitschrift: Solid State Ionics
Verlag: ELSEVIER SCIENCE BV
Jahr der Veröffentlichung: 2017
Band: 300
Seitenbereich: 106-113
ISSN: 0167-2738
Sprache: Englisch


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.



FAU-Autoren / FAU-Herausgeber

Khansur, Neamul Hayet Dr.
Lehrstuhl für Werkstoffwissenschaften (Glas und Keramik)
Webber, Kyle Prof.
Professur für Werkstoffwissenschaften (Funktionskeramik)


Autor(en) der externen Einrichtung(en)
Karlsruhe Institute of Technology (KIT)
NTNU Trondheim - Norwegian University of Science and Technology
Technische Universität Darmstadt
University of New South Wales (UNSW)


Zitierweisen

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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Zuletzt aktualisiert 2018-08-11 um 20:50