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@ARTICLE{Parras:878612,
      author       = {Parras, Jana P. and Cao, Chen and Ma, Zheng and Mücke,
                      Robert and Jin, Lei and Dunin‐Borkowski, Rafal and
                      Guillon, Olivier and De Souza, Roger A.},
      title        = {{T}he grain‐boundary resistance of {C}e{O} 2 ceramics:
                      {A} combined microscopy‐spectroscopy‐simulation study of
                      a dilute solution},
      journal      = {Journal of the American Ceramic Society},
      volume       = {103},
      number       = {3},
      issn         = {1551-2916},
      address      = {Westerville, Ohio},
      publisher    = {Soc.},
      reportid     = {FZJ-2020-02950},
      pages        = {1755 - 1764},
      year         = {2020},
      abstract     = {Weakly acceptor‐doped ceria ceramics were characterized
                      structurally and compositionally with advanced transmission
                      electron microscopy (TEM) techniques and electrically with
                      electrochemical impedance spectroscopy (EIS). The grain
                      boundaries studied with TEM were found to be free of second
                      phases. The impedance spectra, acquired in the range 703 ≤
                      T/K ≤ 893 in air, showed several arcs that were analyzed
                      in terms of bulk, grain‐boundary, and electrode responses.
                      We ascribed the grain‐boundary resistance to the presence
                      of space‐charge layers. Continuum‐level simulations were
                      used to calculate charge‐carrier distributions (of
                      acceptor cations, oxygen vacancies, and electrons) in these
                      space‐charge layers. The acceptor cations were assumed to
                      be mobile at high (sintering) temperatures but immobile at
                      the temperatures of the EIS measurements. Space‐charge
                      formation was assumed to be driven by the segregation of
                      oxygen vacancies to the grain‐boundary core. Comparisons
                      of data from the simulations and from the EIS measurements
                      yielded space‐charge potentials and the segregation energy
                      of vacancies to the grain‐boundary core. The
                      space‐charge potentials from the simulations are compared
                      with values obtained by applying the standard, analytical
                      (Mott–Schottky and Gouy–Chapman) expressions. The
                      importance of modelling space‐charge layers from the
                      thermodynamic level is demonstrated.},
      cin          = {ER-C-1},
      ddc          = {660},
      cid          = {I:(DE-Juel1)ER-C-1-20170209},
      pnm          = {143 - Controlling Configuration-Based Phenomena (POF3-143)
                      / DFG project 274005202 - SPP 1959: Manipulation of matter
                      controlled by electric and magnetic fields: Towards novel
                      synthesis and processing routes of inorganic materials
                      (274005202) / DFG project 319339707 - Diffusionsgesteuerte
                      Prozesse in polykristallinem Ceroxid: Kombinierte Wirkung
                      von elektrischem Feld und mechanischer Belastung},
      pid          = {G:(DE-HGF)POF3-143 / G:(GEPRIS)274005202 /
                      G:(GEPRIS)319339707},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000492529100001},
      doi          = {10.1111/jace.16843},
      url          = {https://juser.fz-juelich.de/record/878612},
}