2022-Sustainable Industrial Processing Summit
SIPS2022 Volume 1 Alario-Franco Intl. Symp Solid State Chemistry

Editors:F. Kongoli, F. Marquis, S. Kalogirou, B. Raveau, A. Tressaud, H. Kageyama, A. Varez, R. Martins.
Publisher:Flogen Star OUTREACH
Publication Year:2022
Pages:154 pages
ISBN:978-1-989820-34-6 (CD)
ISSN:2291-1227 (Metals and Materials Processing in a Clean Environment Series)
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    Percolation Effects during Ionic Motion

    Manfred Martin1;
    1RWTH AACHEN UNIVERSITY, Aachen, Germany;
    Type of Paper: Keynote
    Id Paper: 236
    Topic: 52

    Abstract:

    Interest in materials exhibiting oxygen ion and/or proton conduction has increased during the last years owing to their great importance for energy and environmental applications.
    Ceria-based oxides are regarded as key oxide materials because rare earth-doped ceria shows a high oxygen ion conductivity even at intermediate temperatures. Using density-functional theory (DFT), we have investigated defect interaction and oxygen migration energies as well. By means of Kinetic Monte Carlo (KMC) simulations we then investigated the oxygen ion conductivity. We show that all interactions between the defects, namely vacancy-dopant attraction, dopant-dopant repulsion and vacancy-vacancy repulsion as well contribute to the so-called conductivity maximum of the ionic conductivity [1].
    BaZrO3-based oxides are proto-type proton conductors. Using density-functional theory (DFT), we have investigated defect interaction and proton migration energies in Y-doped BaZrO3. The macroscopic proton conductivity was then investigated by means of KMC simulations. We discuss the resulting proton conductivities concerning special percolation pathways for protons [2].
    Finally, we compare our theoretical results with experimental ones and discuss similarities and differences between oxygen ion and proton conductors.

    Keywords:

    inorganic solids; functional materials; solid state chemistry; oxygen ion conductor; conductivity maximum; proton conductor; percolation

    References:

    [1] J. Koettgen, S. Grieshammer, P. Hein, B. Grope, M. Nakayama, M. Martin, Phys.Chem.Chem.Phys. 20 (2018) 14291-14321.
    [2] F.M. Draber, C. Ader, J.P. Arnold, S. Eisele, S. Grieshammer, S. Yamaguchi, M. Martin, Nature Materials 19 (2020) 338–346.

    Cite this article as:

    Martin M. (2022). Percolation Effects during Ionic Motion. In F. Kongoli, F. Marquis, S. Kalogirou, B. Raveau, A. Tressaud, H. Kageyama, A. Varez, R. Martins. (Eds.), Sustainable Industrial Processing Summit SIPS2022 Volume 1 Alario-Franco Intl. Symp Solid State Chemistry (pp. 123-124). Montreal, Canada: FLOGEN Star Outreach