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Yttrium doping of Ba0.5Sr0.5Co0.8Fe0.2O3-δ part II: Influence on oxygen transport and phase stability |
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| Authors: | Lana-Simone Unger Rian Ruhl Matthias Meffert Christian Niedrig Wolfgang Menesklou Stefan F Wagner Dagmar Gerthsen Henny JM Bouwmeester Ellen Ivers-Tiffée |
| Affiliation: | 1. Institute for Applied Materials – Electrical and Electronic Engineering (IAM-WET), Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany;2. Electrochemistry Research Group, Membrane Science and Technology, Faculty of Science and Technology, MESA+ Institute for Nanotechnology, University of Twente, Enschede, The Netherlands;3. Laboratory for Electron Microscopy (LEM), Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany |
| Abstract: | Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) in its cubic perovskite phase has attracted much interest for potential use as oxygen transport membrane (OTM) due to its very high oxygen permeability at high temperatures. However, performance degradation due to a sluggish phase decomposition occurs when BSCF is operated below 840?°C. Partial B-site substitution of the transition metal cations in BSCF by larger and redox-stable cations has emerged as a potential strategy to improve the structural stability of cubic BSCF. In this study, the influence of yttrium doping (0…10?mol-%) on oxygen transport properties and stability of the cubic BSCF phase is assessed by in situ electrical conductivity relaxation (ECR) and electrical conductivity measurements during long-term thermal annealing both at 700?°C and 800?°C. Detailed phase analysis is performed by scanning electron microscopy (SEM) after long-term annealing of the samples in air at different temperatures. |
| Keywords: | BSCF Structural stability Yttrium doping Oxygen transport membrane Electrical conductivity relaxation |
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