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@ARTICLE{Unger:844396,
      author       = {Unger, Lana-Simone and Niedrig, Christian and Wagner,
                      Stefan F. and Menesklou, Wolfgang and Baumann, Stefan and
                      Meulenberg, Wilhelm A. and Ivers-Tiffée, Ellen},
      title        = {{Y}ttrium doping of {B}a 0.5 {S}r 0.5 {C}o 0.8 {F}e 0.2 {O}
                      3-δ part {I}: {I}nfluence on oxygen permeation, electrical
                      properties, reductive stability, and lattice parameters},
      journal      = {Journal of the European Ceramic Society},
      volume       = {38},
      number       = {5},
      issn         = {0955-2219},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2018-01815},
      pages        = {2378 - 2387},
      year         = {2018},
      abstract     = {Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) exhibits a very high
                      oxygen permeability in its cubic perovskite phase, making it
                      a promising candidate for high-temperature energy-related
                      applications such as oxygen-transport membranes. It suffers,
                      however, from a pronounced phase instability at
                      application-relevant temperatures below 840 °C which is
                      presumed to result from a valence change of B-site cobalt.
                      In an attempt to stabilize the cubic BSCF phase, monovalent
                      Y3+ was doped in small concentrations $(1–10 mol-\%$
                      yttrium) onto its B-site. The influence of this doping on
                      the physico-chemical properties (electrical conductivity,
                      reductive stability, lattice constant), on the sintering
                      behavior, and on the oxygen permeation of BSCF has been
                      systematically investigated. Despite a slightly adverse
                      effect to permeability (decrease in oxygen permeation by
                      about $20–30\%),$ a doping concentration of $10 mol-\%$
                      Y is found to completely suppress secondary-phase formation
                      and, hence, stabilize the cubic BSCF system at 800 °C.
                      These findings are extremely promising with regard to a
                      long-term operation of BSCF in atmospheres free of acidic
                      impurity gases.},
      cin          = {IEK-1},
      ddc          = {660},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {113 - Methods and Concepts for Material Development
                      (POF3-113)},
      pid          = {G:(DE-HGF)POF3-113},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000426029700015},
      doi          = {10.1016/j.jeurceramsoc.2017.12.045},
      url          = {https://juser.fz-juelich.de/record/844396},
}