% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@INPROCEEDINGS{Mowe:1044598,
      author       = {Mowe, Patrick and Neuhaus, Kerstin},
      title        = {{E}lectrochemical characterization of pyrochlore materials
                      for potential application in low-temperature devices},
      reportid     = {FZJ-2025-03271},
      year         = {2025},
      abstract     = {Crystalline solid ion conductors are of huge importance to
                      contemporary energy and sensor technologies. With the
                      continuous progression of materials science, these materials
                      play an increasingly prominent role in the development of
                      next-generation devices for sustainable energy storage and
                      generation. Oxide ceramics like yttria-stabilized zirconia
                      (YSZ) can offer high ionic conductivity at elevated
                      temperatures in combination with high (electro)chemical
                      stability, making them pivotal to various electrochemical
                      devices [1].Electro-chemo-X (EC-X) devices or on-chip
                      batteries and micro fuel cells, however, are expected to
                      operate in a much lower temperature range between 200 °C
                      and room temperature and require chemical stability against
                      Si and easy thin film preparation, e.g. by sputtering.
                      Promising fast proton conductors for these applications are
                      highly doped ceria and zirconia, but there are few reliable
                      studies on the ionic and electronic conductivity of relevant
                      materials [2].In recent years, significant attention has
                      been directed towards materials with the general formula
                      $A_2^(3+)$ $B_2^(4+)$ $O_7,$ which exhibit remarkable
                      high-temperature proton conductivity coupled with oxygen ion
                      conductivity. However, the precise structure of these
                      materials is often challenging to predict and can vary from
                      a fluorite-type to a pyrochlore or even a monoclinic
                      structure, or a mixture of these structures [3]. For this
                      work, materials with the composition $A_2^(3+)$ $B_2^(4+)$
                      $O_7$ (with A e.g. La, Y, Sm, Pr and B e.g. Ce, Zr) were
                      prepared via the Pechini method. Using XRD, SEM and Raman
                      spectroscopy, the pellets were characterized for purity and
                      structural information. In order to gain a comprehensive
                      understanding of the transport properties of the samples,
                      the ionic and electronic partial conductivities at high
                      temperatures characterized by impedance spectroscopy and
                      Hebb-Wagner measurements. Given the low ionic conductivity
                      at room temperature, atomic force microscopy (AFM)-based
                      measurement techniques were additionally employed to obtain
                      information regarding near-surface transport processes in
                      this temperature regime [4]: Kelvin Probe Force Microscopy
                      (KPFM) was used to analyze the surface potential, which is a
                      sensitive indicator of changes in local defect
                      concentrations and offers information about the bulk and
                      grain boundary potential differences, thus providing
                      insights into differences in transport characteristics [5].
                      The electrochemical results are discussed in line with the
                      precise structure and in the context of a defect
                      model.Acknowledgements: The present study was funded by the
                      German Research Foundation – project
                      #52316440.Literature:[1] D.A. Agarkov, M.A. Borik, G.M.
                      Korableva, et al., J Solid State Electrochem 28, (2024)
                      1901–1908.[2] K. Neuhaus, H. D. Wiemhöfer, Solid State
                      Ionics. 371 (2021) 115771.[3] M.A. Subramanian, G.
                      Aravamudan, G.V.s. Rao, Prog. Solid State Chem. 15 (1983)
                      (2) 55-143.[4] K. Neuhaus, C. Schmidt, L. Fischer, W. A.
                      Meulenberg, K. Ran, J. Mayer, S. Baumann, Beilstein J.
                      Nanotechnology. (2021) (12) 1380-1391.[5] S. Sadewasser, G.
                      T. Kelvin Probe Force Microscopy; 2012.},
      month         = {Jul},
      date          = {2025-07-13},
      organization  = {19th International Symposium on Solid
                       Oxide Fuel Cells, Stockholm (Sweden),
                       13 Jul 2025 - 18 Jul 2025},
      subtyp        = {After Call},
      cin          = {IMD-4},
      cid          = {I:(DE-Juel1)IMD-4-20141217},
      pnm          = {1221 - Fundamentals and Materials (POF4-122)},
      pid          = {G:(DE-HGF)POF4-1221},
      typ          = {PUB:(DE-HGF)24},
      doi          = {10.34734/FZJ-2025-03271},
      url          = {https://juser.fz-juelich.de/record/1044598},
}