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High-Temperature Creep Behavior of Mixed Conducting La0.5Sr0.5Fe1−xCoxO3- (0.5≤x≤1) Materials

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Steady-state compressive creep rate of La0.5Sr0.5Fe0.5Co0.5O3− (LSFC) and La0.5Sr0.5CoO3− (LSC) is reported in the temperature region 900°–1050°C and stress range 5–28 MPa. The stress exponents for the two materials were 1.71±0.18 and 1.24±0.15, respectively. The activation energy for creep was considerably higher for LSC (619±56 kJ/mol) than for LSFC (392±28 kJ/mol). The grain size exponent for LSC was 1.28±0.14. Considerably higher creep rates were observed for both materials in N2 compared with air. Relaxation by creep of chemical-induced stresses in oxygen-permeable membranes is addressed, especially at low partial pressure of oxygen.

Document Type: Research Article


Affiliations: 1: Department of Materials Science and Engineering, Norwegian University of Science and Technology, 7491 Trondheim, Norway 2: High Temperature Materials Laboratory, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA

Publication date: September 1, 2006


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