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@INPROCEEDINGS{Lenser:834368,
      author       = {Lenser, Christian and Gunkel, Felix and Sohn, Yoo Jung and
                      Menzler, Norbert H.},
      title        = {{Q}uantifying the oxygen stoichiometry of {P}r-doped ceria
                      through {X}-ray diffraction},
      reportid     = {FZJ-2017-04341},
      year         = {2017},
      abstract     = {Recent studies on Pr-doped CeO$_{2}$ (PCO) model electrodes
                      suggest that the fast oxygen surface exchange coefficient
                      and high ionic conductivity of PCO hold the potential for a
                      high performance air electrode material for solid oxide fuel
                      cells (SOFCs).[1] PCO behaves as a mixed ionic-electronic
                      conductor (MIEC) in air at elevated temperature due to the
                      reduction of Pr$^{4+}$ to Pr$^{3+}$ and a concomitant
                      polaronic conductivity σpol. In this study, we characterize
                      the reduction behavior of PCO with different Pr contents in
                      air using high temperature X-ray diffraction (HT-XRD) and
                      compare the results to TGA measurements. Rietveld analysis
                      of the HT-XRD data reveals a temperature-dependent
                      micro-strain in the PCO lattice that we associate with
                      lattice disorder due to the different ionic radii of
                      Pr$^{4+}$ and Pr$^{3+}$. This allows us to identify the
                      precise temperature at which the polaronic conductivity
                      σpol is highest for a given Pr-content. We discuss the
                      effect of the temperature dependence of σpol for air
                      electrodes in the context of conductivity and impedance
                      measurements.1. Chen, D., S.R. Bishop, and H.L. Tuller,
                      Praseodymium-cerium oxide thin film cathodes: Study of
                      oxygen reduction reaction kinetics. Journal of
                      Electroceramics, 2012. 28(1): p. 62-69.},
      month         = {Jun},
      date          = {2017-06-18},
      organization  = {21st International Conference on Solid
                       State Ionics, Padova (Italy), 18 Jun
                       2017 - 23 Jun 2017},
      subtyp        = {Other},
      cin          = {IEK-1},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {135 - Fuel Cells (POF3-135) / SOFC - Solid Oxide Fuel Cell
                      (SOFC-20140602)},
      pid          = {G:(DE-HGF)POF3-135 / G:(DE-Juel1)SOFC-20140602},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/834368},
}