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@ARTICLE{Schober:44537,
      author       = {Schober, T. and Grover Coors, W.},
      title        = {{E}ntry and exit of water vapor in bulk ceramic proton
                      conductors},
      journal      = {Solid state ionics},
      volume       = {176},
      issn         = {0167-2738},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {PreJuSER-44537},
      pages        = {357 - 362},
      year         = {2005},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {An experimental study of the processes occurring during
                      protonation of bulk ceramic proton conductors,
                      BaCe0.9Y0.1O2.95 (BCY10) and BaCe0.8Y0.2O2.9 (BCY20), is
                      presented here. One of the faces of a disc-shaped diffusion
                      membrane was connected to a mass spectrometer in a vacuum
                      system permitting the identification of the species crossing
                      the ceramic-vacuum interface. Exposing the sample to D2O led
                      to a strong signal of D2O+ after a certain lag time. From
                      these lag times, the tracer diffusivity of hydrogen could be
                      determined as a function of temperature. The permeation of
                      steam consisted of two components: a fast component,
                      essentially given by the diffusivities of deuterons
                      (protons), and a slow component, ascribed to chemical
                      diffusion of deuterons (protons) coupled to oxygen vacancies
                      with the possibility of participation of even more complex
                      defects. Dilatometry measurements of different specimens of
                      BCY10 and BCY20 also revealed quite clearly this two-phase
                      pattern during protonation. Diffusion measurements on
                      protonic ceramic membranes using (H2O)-O-18 permitted the
                      determination of the tracer diffusivity of oxygen. All of
                      the above measurements were interpreted in the light of the
                      chemical diffusion model developed by Kreuer et al. (C) 2004
                      Elsevier B.V. All rights reserved.},
      keywords     = {J (WoSType)},
      cin          = {IFF-IEM},
      ddc          = {530},
      cid          = {I:(DE-Juel1)VDB321},
      pnm          = {Kondensierte Materie},
      pid          = {G:(DE-Juel1)FUEK242},
      shelfmark    = {Chemistry, Physical / Physics, Condensed Matter},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000226872700017},
      doi          = {10.1016/j.ssi.2004.07.019},
      url          = {https://juser.fz-juelich.de/record/44537},
}