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@ARTICLE{Falkenstein:885961,
      author       = {Falkenstein, Andreas and De Souza, Roger A. and Meulenberg,
                      Wilhelm Albert and Martin, Manfred},
      title        = {{A} quantitative analysis of two-fold electrical
                      conductivity relaxation behaviour in mixed
                      proton–oxide-ion–electron conductors upon hydration},
      journal      = {Physical chemistry, chemical physics},
      volume       = {22},
      number       = {43},
      issn         = {1463-9084},
      address      = {Cambridge},
      publisher    = {RSC Publ.},
      reportid     = {FZJ-2020-04192},
      pages        = {25032-25041},
      year         = {2020},
      abstract     = {Electrical conductivity relaxation experiments on oxides
                      with three mobile charge carriers, H+, O2− and e−, yield
                      in (de-)hydration experiments kinetic parameters (diffusion
                      coefficients and surface reaction constants). In addition,
                      three amplitude factors are obtained, but they have not been
                      given further consideration because quantitative expressions
                      for their forms are lacking. In this study, the forms of the
                      amplitude factors are derived for a diffusion-limited and a
                      surface-reaction-limited case and a mixed case. In order to
                      demonstrate the benefits of the approach, the electrical
                      conductivity relaxation behaviour of lanthanum tungstate
                      (La5.4WO11.1, LaWO54) was investigated experimentally over
                      the temperature range 923 ≤ T/K ≤ 1223. A switch from
                      two-fold non-monotonic relaxation behaviour at high
                      temperatures to two-fold monotonic behaviour at low
                      temperatures upon hydration was observed. The switch in sign
                      of the fast kinetics' amplitude factor can be assigned to
                      the electrochemical mobility of protons surpassing the
                      electron–hole mobility with decreasing temperature.},
      cin          = {IEK-1},
      ddc          = {540},
      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},
      pubmed       = {pmid:33112301},
      UT           = {WOS:000588601200015},
      doi          = {10.1039/D0CP03264F},
      url          = {https://juser.fz-juelich.de/record/885961},
}