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Meeting MS&T22: Materials Science & Technology
Symposium Dislocations in Ceramics: Processing, Structure, Mechanics, and Functionality
Presentation Title Dislocation-Modified Photoelectric Properties of Oxide Ceramics
Author(s) Mehrzad Soleimany, Maximilian Kissel, Lukas Porz, Till Frömling, Marin Alexe, Jürgen Rödel
On-Site Speaker (Planned) Mehrzad Soleimany
Abstract Scope Controlling point defects and interfaces is the usual way to tailor semiconducting ceramics' electrical and photoelectric properties. Dislocations as one-dimensional line defects have so far been mostly disregarded for modification of functional properties because of the brittle nature of ceramics. However, they are finding increasing attention recently. They provide the opportunity to modify the materials' functional properties, e.g., ferroelectric properties, thermal, electronic, and ionic conductivity. This work illustrates the impact of dislocations on the photoelectric properties of ZnS and donor doped SrTiO3. We reveal that the materials can be plastically deformed at room temperature using ball indentation and cyclic loading without the formation of cracks, which leads to the increase of the dislocation density by three orders of magnitude. Utilizing photocurrent measurements, especially local investigations by a conductive atomic force microscope under laser illumination, an increase in the current can be rationalized due to the presence of dislocations.
Proceedings Inclusion? Undecided


Atomistic and Multiscale Computational Analysis of the Connection between Dislocation Slip and Ionic Transport in Plastically Deformed Oxides
Charged Dislocations in Ionic Ceramics: Equilibrium and Kinetics
Conceptual Framework for Dislocation Mechanics in Ceramics
Dislocation-Modified Photoelectric Properties of Oxide Ceramics
Effects of Light Illumination on the Dislocation-mediated Plasticity in Single-crystalline ZnO
In Situ Observation of Fracture Dominated by a Single Dislocation and Its Governing Mechanics
Understanding and Engineering Dislocations in Oxides at Room Temperature

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