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A case study of the effect of grain size on the oxygen permeation flux of BSCF disk-shaped membrane fabricated by thermoplastic processing

  • Salehi, Mehdi Laboratory for High Performance Ceramics, Empa, Swiss Federal Laboratories for Materials Science and Technology, Duebendorf, Switzerland - The Fribourg Center for Nanomaterials (FriMat) and Department of Geosciences, University of Fribourg, Switzerland
  • Clemens, Frank Laboratory for High Performance Ceramics, Empa, Swiss Federal Laboratories for Materials Science and Technology, Duebendorf, Switzerland
  • Pfaff, Ewald M. Institute for Materials Applications in Mechanical Engineering, RWTH Aachen University, Germany
  • Diethelm, Stefan Laboratory for Industrial Energy Systems (LENI), STI, Swiss Federal Institute of Technology, Lausanne, Switzerland
  • Leach, Colin School of Materials, The University of Manchester, United Kingdom
  • Graule, Thomas Laboratory for High Performance Ceramics, Empa, Swiss Federal Laboratories for Materials Science and Technology, Duebendorf, Switzerland
  • Grobéty, Bernard The Fribourg Center for Nanomaterials (FriMat) and Department of Geosciences, University of Fribourg, Switzerland
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    08.11.2011
Published in:
  • Journal of Membrane Science. - 2011, vol. 382, no. 1-2, p. 186-193
BSCF membrane
Thermoplastic processing
EBSD method
Grain size
CM analysis
English Oxygen permeability measurements of Ba0.5Sr0.5Co0.8Fe0.2O3−δ (BSCF) disk shaped membranes fabricated by thermoplastic processing and sintered at different temperatures (1000–1100 °C), showed no influence of the grain size on the oxygen permeation fluxes. To further investigations, Electron Backscattered Diffraction (EBSD) and Conductive mode (CM) microscopy methods were used for texture analysis and observation of the local electrical behavior in the BSCF membranes, respectively. EBSD results revealed that the grain size of the membranes increased with increasing the sintering temperature from an average of 3.32 μm at 1000 °C to 18.25 μm at 1100 °C. Also, it was seen that there was no textural difference between the different samples. CM analysis demonstrated that the electronic conductivity of the grains and grain boundaries was similar in the membrane sintered at 1000 °C. Finally, the stability of the membrane under the operation conditions was tested, and it was found that the permeation flux was nearly constant at 900 °C after an operation time of more than 50 h, whereas oxygen permeation flux declined after a relative short time at 825 °C.
Faculty
Faculté des sciences et de médecine
Department
Département de Géosciences
Language
  • English
Classification
Chemistry
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/302076
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