Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/102785
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://hdl.handle.net/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, проиндексированные в SCOPUS и WoS CC

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