Publication date: 10th April 2024
The functional properties of ceramics are usually tailored by designing point defects and interfaces. Dislocations as one-dimensional line defects are so far underrepresented means to modify respective properties. However, dislocations possess the ability to alter these extensively. Given new methods of introducing dense dislocation networks in multiple ceramics, extensive investigations found a significant impact on the conductivity of electronic and ionic oxide ceramic conductors. The opportunity to tune ceramics beyond what can be achieved by chemical doping is of significant interest. Further affected properties include ferroelectricity and photoelectric responses. The change in photoelectric and surface electrical behavior shows that dislocations can be a new pathway for altering important parameters concerning catalysis, photocatalysis, and modification of Schottky barriers. The impact of dislocations on the ceramics depends on a convolution of dislocation character, core properties, possibly existing space charges, and mesoscopic structure. It is thus essential to combine the understanding of mesoscopic dislocation structure and its mechanical behavior at elevated temperatures. This makes dislocations in ceramics an exciting interdisciplinary research field.
We would like to thank Prof. Shuang Gao, Prof. Qi Li, Prof. Marin Alexe, Prof. Atsutomo Nakamura, Prof. Jürgen Janek, Prof. Jürgen Fleig, Prof. Gehrhard Dehm, Dr. Marcus Rohnke, Dr. Alexander Opitz, Dr. Xufei Fang and Dr. Hanna Bishara for collaboration, discussion and help. Furthermore, we acknowledge the funding from the Deutscher Akademischer Austauschdienst (DAAD) for the Ph.D. fellowship with award number 91669061 and the Deutsche Forschungsgemeinschaft for funding this work under no. 398795637.
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