Journal Article

PreJuSER-8898

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Mechanical aspects of ferro-elastic behavior and phase composition of La0.58Sr0.4Co0.2Fe0.8O3

Huang, B. X.FZJ* ; Malzbender, J.FZJ* ; Steinbrech, R. W.FZJ* ; Wessel, E.FZJ* ; Penkalla, H.-J.FZJ* ; Singheiser, L.FZJ*

2010
Elsevier New York, NY [u.a.]

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Please use a persistent id in citations: doi:10.1016/j.memsci.2009.11.047

Abstract: Phase composition and thermo-mechanical properties of La0.58Sr0.4Co0.2Fe0.8O3-delta (LSCF) have been studied. The LSCF perovskite material comprised two phases: rhombohedral and cubic, with a ratio that showed to depend on both cooling rate as well as atmosphere. The fracture stress of LSCF was determined on the basis of ring-on-ring bending tests between room temperature (RT) and 800 degrees C. Below 700 degrees C nonlinear load-displacement curves were obtained, an effect that is attributed to the ferro-elasticity of the rhombohedral phase. Both SEM and TEM verify the existence of a domain structure in the rhombohedral grains. The indentation fracture toughness appears to be insensitive to temperature variations from RT up to 350 degrees C. The importance of thermal history on phase composition and the resulting thermo-mechanical behavior is discussed. (C) 2009 Elsevier B.V. All rights reserved.

Keyword(s): J ; Ceramics (auto) ; Membranes (auto) ; Fracture (auto) ; Oxygen separation (auto) ; Mechanical properties (auto)

Note: The work was funded by the German Ministry of Economics and Technology (BMWI) as part of the research activities in the membrane project "OXYMEM". The authors would like to express their gratitude to Dr. W. Meulenberg and Dr. S. Baumann for preparing and supplying the disk-shaped LSCF specimens. In addition, the invaluable support by XRD characterization provided by Dr. W. Fischer is highly appreciated.

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Contributing Institute(s):

1. Werkstoffstruktur und Eigenschaften (IEF-2)
2. Jülich-Aachen Research Alliance - Energy (JARA-ENERGY)

Research Program(s):

1. Rationelle Energieumwandlung (P12)

Appears in the scientific report 2010

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