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Title: | Oxygen tracer diffusion and surface exchange kinetics in Ba0.5Sr0.5Co0.8Fe0.2O3 - δ |
Authors: | Berenov, A. Atkinson, A. Kilner, J. Ananyev, M. Eremin, V. Porotnikova, N. Farlenkov, A. Kurumchin, E. Bouwmeester, H. J. M. Bucher, E. Sitte, W. |
Issue Date: | 2014 |
Publisher: | Elsevier B.V. |
Citation: | Oxygen tracer diffusion and surface exchange kinetics in Ba0.5Sr0.5Co0.8Fe0.2O3 - δ / A. Berenov, A. Atkinson, J. Kilner, et al. — DOI 10.1016/j.ssi.2014.09.031 // Solid State Ionics. — 2014. — Vol. 268. — Iss. Part A. — P. 102-109. |
Abstract: | The oxygen tracer diffusion coefficient, Db∗, and the oxygen tracer surface exchange coefficient, k, were measured in Ba0.5Sr0.5Co0.8Fe0.2O3 - δ (BSCF5582) over the temperature range of 310-800 °C and the oxygen partial pressure range of 1.3 × 10- 3-0.21 bar. Several measurement techniques were used: isotope exchange followed by depth profiling (IEDP) within individual single grains or line scanning (IELS) along the sample cross-section and gas-phase analysis (GPA). Surface exchange kinetics was initially found to be slow and presumably inhibited by the formation of a passivating layer on the sample surface. High temperature pre-anneals (900-950 °C) changed the nature of this layer and enhanced surface exchange. Fast bulk oxygen diffusion and surface exchange kinetics were observed after high temperature pre-anneals within the temperature range studied. The activation energies for 18O tracer diffusion and surface exchange at 0.21 bar were 0.72 ± 0.05 and 1.10 ± 0.15 eV, respectively. The tracer diffusion coefficient showed weak dependence upon oxygen partial pressure, whereas the surface exchange coefficient exhibited strong oxygen partial pressure dependence. The microstructure of the samples (the porosity and grain size) had a profound effect on the measured tracer diffusion coefficient. © 2014 Elsevier B.V. |
Keywords: | BARIUM STRONTIUM IRON COBALTATE GAS-PHASE ANALYSIS OXYGEN TRACER DIFFUSION OXYGEN TRACER SURFACE EXCHANGE SECONDARY-ION MASS SPECTROSCOPY SOLID OXIDE FUEL CELLS ACTIVATION ENERGY BARIUM COMPOUNDS COBALT COMPOUNDS DEPTH PROFILING DIFFUSION IN GASES FLUORINE COMPOUNDS GAS FUEL ANALYSIS GASES ION EXCHANGE IRON COMPOUNDS KINETICS OXYGEN PARTIAL PRESSURE SECONDARY ION MASS SPECTROMETRY SOLID OXIDE FUEL CELLS (SOFC) STRONTIUM COMPOUNDS COBALTATES GAS-PHASE ANALYSIS OXYGEN TRACER DIFFUSION SECONDARY ION MASS SPECTROSCOPY SURFACE EXCHANGES BORON COMPOUNDS |
URI: | http://elar.urfu.ru/handle/10995/102785 |
Access: | info:eu-repo/semantics/openAccess |
SCOPUS ID: | 84908332634 |
PURE ID: | 402671 d0885e18-526d-4eef-b17b-360f67c62b19 |
ISSN: | 1672738 |
DOI: | 10.1016/j.ssi.2014.09.031 |
Appears in Collections: | Научные публикации ученых УрФУ, проиндексированные в SCOPUS и WoS CC |
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