SKM 2023 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 2: Focus: Dislocations in Ceramics: Mechanics, Structures and Functionality (joint session KFM/MA)

KFM 2.6: Vortrag

Montag, 27. März 2023, 16:45–17:05, POT 51

Tailoring ceramic functional properties of YSZ with dislocations — •Till Frömling, Qaisar Muhammad, and Jürgen Rödel — 1Division of Nonmetallic-Inorganic Materials, Department of Materials and Earth Sciences, Technical University of Darmstadt, Alarich-Weiss-Str. 2, Darmstadt 64287, Germany

The defect chemistry of zirconia is usually modified by doping with high levels of yttrium. This induces a very high oxygen vacancy concentration which is responsible for the excellent ionic conductivity. There is a high demand for even better oxygen conductors because this would benefit applications like solid oxide fuel cells and solid state electrolyzers. Nevertheless, a limit has been reached concerning the doping strategy. Therefore, we suggestion to use dislocations as one-dimensional defects. These have so far been mostly disregarded as defects for modification of functional properties but are finding increasing attention recently. However, ceramics are generally brittle and thus not easily plastically deformable. Besides the difficulty of introducing dislocations into ceramics, their exact influence on functional properties is still unclear. Our investigations of yttria-stabilized zirconia show that mechanically introduced dislocations can enhance ionic conductivity significantly. This illustrates the opportunity to tune ceramics beyond what can be achieved by chemical doping.