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@ARTICLE{Baumann:10085,
      author       = {Baumann, S. and Schulze-Küppers, F. and Roitsch, S. and
                      Betz, M. and Zwick, M. and Pfaff, E.M. and Meulenberg, W. A.
                      and Mayer, J. and Stöver, D.},
      title        = {{I}nfluence of sintering conditions on microstructure and
                      oxygen permeation of
                      {B}a(0.5){S}r(0.5){C}o(0.8){F}e(0.2){O}(3-delta) ({BSCF})
                      oxygen transport membranes},
      journal      = {Journal of membrane science},
      volume       = {359},
      issn         = {0376-7388},
      address      = {New York, NY [u.a.]},
      publisher    = {Elsevier},
      reportid     = {PreJuSER-10085},
      pages        = {102 - 109},
      year         = {2010},
      note         = {Financial support from the Helmholtz Association of German
                      Research Centres (Initiative and Networking Fund) through
                      the Helmholtz Alliance MEM-BRAIN is gratefully
                      acknowledged.},
      abstract     = {Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF) exhibits high oxygen
                      permeability, which is why it is being discussed for gas
                      separation (oxygen transport membrane, OTM) in zero-emission
                      power plants using oxyfuel technology when the membrane is
                      operated in a clean environment, i.e. no flue gas contact.
                      We investigate the influence of membrane processing on
                      microstructure and oxygen permeation. Pure-phase BSCF powder
                      is synthesized using a modified Pechini method. For
                      comparison, commercially available powder is also used,
                      synthesized by a solid-state reaction. Disk-shaped membranes
                      of various microstructures, i.e. closed porosities and grain
                      sizes, are prepared by uniaxial pressing and sintering of
                      the powders processed in different ways. The powders and
                      membranes are characterized by methods including BET, SEM,
                      XRD, and DSC. The microstructures obtained by different
                      sintering conditions are investigated by SEM and TEM.
                      Sintering at 1150 degrees C leads to incongruent melting of
                      BSCF indicated by DSC. The liquid phase appears at
                      three-phase boundaries grain-grain-air and consists of
                      nearly pure cobalt oxide with small impurities of barium and
                      strontium detected by TEM/EDX analysis. Oxygen permeation of
                      the membranes is measured in an air/Ar gradient depending on
                      temperature and membrane microstructure. The closed porosity
                      of different processed membranes is varied between 2 and
                      $15\%$ with uniform grain sizes in the range of approx. 10
                      mu m. The average grain size is increased from 10 to 45 mu m
                      by increasing the sintering temperature. Neither porosity
                      nor the grain size significantly influences the oxygen
                      permeation rate of 1-mm-thick disks in the investigated
                      parameter range. (C) 2010 Elsevier B.V. All rights
                      reserved.},
      keywords     = {J (WoSType)},
      cin          = {IEF-1 / JARA-ENERGY / JARA-FIT},
      ddc          = {570},
      cid          = {I:(DE-Juel1)VDB809 / $I:(DE-82)080011_20140620$ /
                      $I:(DE-82)080009_20140620$},
      pnm          = {Rationelle Energieumwandlung},
      pid          = {G:(DE-Juel1)FUEK402},
      shelfmark    = {Engineering, Chemical / Polymer Science},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000279953300012},
      doi          = {10.1016/j.memsci.2010.02.002},
      url          = {https://juser.fz-juelich.de/record/10085},
}