Electrical and chemical transport properties are measured with various methods, which also allow to determine electronic or ionic conductivities and to investigate the elementary processes which determine the transport properties.

Research areas and related projects:
  • AC impedance spectroscopy allows one to separate electrochemical processes with different characteristic time scale, e.g. bulk from grain boundary and electrode response.
    • blocking character of grain boundaries in SrTiO3 bicrystals

      R. A. De Souza, J. Fleig, J. Maier, O. Kienzle, Z. Zhang, W. Sigle, and R. Rühle
      Electrical and Structural Characterization of a Low-Angle Tilt Grain Boundary in Iron-Doped Strontium Titanate Journal of the American Ceramic Society 86(6), 922–928 (2003). DOI:10.1111/j.1151-2916.2003.tb03398.x

    • grain boundary properties in nanocrystalline ceria

      S. Kim and J. Maier: On the Conductivity Mechanism of Nanocrystalline Ceria Journal of The Electrochemical Society 149(10), J73–J83 (2002). DOI: 10.1149/1.1507597

  • Microcontact measurements:
    • measurement on individual grain boundaries in electroceramic materials

      M. Shirpour, C. T. Lin, R. Merkle, and J. Maier: Nonlinear electrical grain boundary properties in proton conducting Y-BaZrO3 supporting the space charge depletion model Physical Chemistry Chemical Physics 14(2), 730–740 (2012). DOI: 10.1039/C1CP22487E

    • oxygen exchange kinetics on SOFC model cathodes

      J. Fleig, F. S. Baumann, V. Brichzin, H.-R. Kim, J. Jamnik, G. Cristiani, H.-U. Habermeier, and J. Mai­er: Thin Film Microelectrodes in SOFC Electrode Research Fuel Cells 6(3–4), 284–292 (2006). DOI: 10.1002/fuce.200500209

  • DC polarization with selectively blocking electrodes
    • separating electronic and ionic conductivity in LiFePO4 single crystals

      R. Amin, P. Balaya, and J. Maier: Anisotropy of Electronic and Ionic Transport in LiFePO4 Single Crystals Electrochemical and Solid-State Letters 10(1), A13–A16 (2007). DOI:10.1149/1.2388240

  • EMF measurements:
    • energetics of nano-versus micrometer grain sized materials

      P. Balaya and J. Maier: Thermodynamics of nano- and macrocrystalline anatase using cell voltage measurements Physical Chemistry Chemical Physics 12(1), 215–219 (2010). DOI:10.1039/b910820c

      A. Schroeder, J. Fleig, H. Drings, R. Wuerschum, J. Maier, and W. Sitte Excess free enthalpy of nanocrystalline silver, determined in a solid electrolyte cell Solid State Ionics 173(1–4), 95–101 (2004). DOI: 10.1016/j.ssi.2004.07.058

  • Analysis of electrochemical impedance spectroscopy of hybrid perovskite device
  • Ion transport and photo-induced phase instability in mixed halide perovskites 
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