The effect of an oxygen partial pressure gradient on the mechanical behavior of perovskite membrane materials |
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| Affiliation: | 1. Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research, IEK-2, 52425 Jülich, Germany;2. Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, 315201 Ningbo, China;1. FUELMAT Group, Institute of Mechanical Engineering, Faculty of Engineering Sciences and Technology, Ecole Polytechnique Fédérale de Lausanne, Station 9, CH-1015 Lausanne, Switzerland;2. Department of Energy Storage and Conversion, Technical University of Denmark, Frederiksborgvej 399, DK-4000 Roskilde, Denmark;3. Topsoe Fuel Cell, Nymoellevej 66, DK-2800 Kgs. Lyngby, Denmark;1. School of Materials Science and Engineering, Shanghai University, Shanghai 200072, People׳s Republic of China;2. State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai 200072, People׳s Republic of China;3. Institute of Mathematics and Physics, Aberystwyth University, Aberystwyth SY23 3BZ, United Kingdom;1. Forschungszentrum Jülich GmbH, Institute for Energy and Climate Research (IEK-1), Leo-Brandt-Str. 1, D-52425 Jülich, Germany |
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| Abstract: | In application of perovskite as oxygen conducting materials the membrane is operated at elevated temperatures under an oxygen gradient. The effect of the partial pressure difference on the mechanical properties is reported in the current work. Ba0.5Sr0.5Co0.8Fe0.2O3−δ (BSCF) and La0.58Sr0.4Co0.2Fe0.8O3−δ (LSCF) samples were annealed under an oxygen gradient. The mechanical properties of cross-sections were characterized using indentation testing. Chemical strains for BSCF and LSCF were too small to detect them after cooling to RT by XRD; however, the results suggest that the indentation crack length is affected by chemical strains for LSCF, but not for BSCF. An anisotropy of the indentation crack length and corresponding apparent fracture toughness is related with the interaction of domain switching and residual strain that is probably also associated with the observation that vacuum (10−5 mbar) annealed LSCF showed surface cracking on heating in air, whereas for BSCF such fracture features were not observed. |
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| Keywords: | Perovskites Membranes Domain switching Chemical strain Fracture toughness |
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