报告人：Dr. Jan Manuel Hinterstein
主题：Multiscale Characterisation of Functional Electroceramics
摘要：Functional electroceramics are used in a broad range of applications such as electromechanical devices, microelectronics, heating or cooling elements as well as current protection. Highest functional properties can be observed in the vicinity of phase boundaries. Dielectric and piezoelectric coefficients peak towards these regions. Therefore, compositions of highest technological interest, in many cases, exhibit phase coexistences. These phases usually are highly correlated, complicating quantitative analysis. Additionally, uniaxial forces such as electric fields or mechanical stresses impose a preferred orientation. In the past years we developed a method that is able to describe all electromechanical effects that occur during operation of these materials. Based on crystallographic methods we are able to calculate the macroscopic behaviour on a model based on the atomic scale. The results also showed the origin of the rise in properties towards the phase boundaries. These quantitative analyses are backed by electron microscopy and compared to phase field siomulations. Based on experimental data and simulations we were able to develop a model for functional electroceramics in the vicinity of phase boundaries.
Dr. Jan Manuel Hinterstein is the group leader of the Emmy Noether Gruppe at the Karlsruhe Institute of Technology since 2016. He obtained his PhD in Materials Science at the Technical University of Darmstadt. Then he worked as a postdoc at the Technical University of Dresden. Afterwards, he joined German Electron Synchrotron as a beamline scientist. He is also the Co-chair of the Special Interest Group Functional Materials of the European Crystallographic Association. His research interests focus on synthesis, characterization and simulation of advanced electroceramics and related functional materials. He is the project leader sponsoring and speaker of the Young Investigator Network. He has published in the leading journals like Nat. Mater., Phys. Rev. Lett., Acta Mater..