Defect formation and mechanical stability of perovskites based on LaCrO3 for solid oxide fuel cells (SOFC)

Different perovskite compositions made of (La,Ca/Sr)CrO3-delta, La(Cr,Mg)O3-delta, La(Cr,Mg/Cu/Co,Al)O3-delta, and (La,Ca)(Cr,Al)O3-delta were investigated. Defect models were evaluated to describe the oxygen vacancy formation and the respective thermodynamic data were determined. The results are us...

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Veröffentlicht in:Journal of the European Ceramic Society 2003-01, Vol.23 (16), p.3009-3020
Hauptverfasser: HILPERT, K, STEINBRECH, R. W, BOROOMAND, F, WESSEL, E, MESCHKE, F, ZUEV, A, TELLER, O, NICKEL, H, SINGHEISER, L
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container_end_page 3020
container_issue 16
container_start_page 3009
container_title Journal of the European Ceramic Society
container_volume 23
creator HILPERT, K
STEINBRECH, R. W
BOROOMAND, F
WESSEL, E
MESCHKE, F
ZUEV, A
TELLER, O
NICKEL, H
SINGHEISER, L
description Different perovskite compositions made of (La,Ca/Sr)CrO3-delta, La(Cr,Mg)O3-delta, La(Cr,Mg/Cu/Co,Al)O3-delta, and (La,Ca)(Cr,Al)O3-delta were investigated. Defect models were evaluated to describe the oxygen vacancy formation and the respective thermodynamic data were determined. The results are used to explain existing literature data on the isothermal expansion of LaCrO3 based perovskites under reducing conditions. Complementary mechanical measurements with selected perovskite compositions revealed that lower oxygen partial pressure causes higher stiffness, strength and fracture toughness. The change in properties is discussed in terms of the observed ferroelastic domains and the interaction of the domain wall motion with the oxygen vacancies. 30 refs.
doi_str_mv 10.1016/s0955-2219(03)00097-9
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source Elsevier ScienceDirect Journals Complete
subjects Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Energy
Energy. Thermal use of fuels
Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc
Exact sciences and technology
Fuel cells
Miscellaneous
Technical ceramics
title Defect formation and mechanical stability of perovskites based on LaCrO3 for solid oxide fuel cells (SOFC)
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