报告题目：Multiscale Characterisation of Functional Electroceramics
报告人：Dr. Jan Manuel Hinterstein
（Institute for Applied Materials, Karlsruhe Institute of Technology）
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 received his PhD from Technische Universit?t Darmstadt (TUD). He then worked as a post-doctoral fellow in TUD as well as a beamline scientist in Deutsches Elektronensynchrotron. In 2013, he joined the University of New South Wales (UNSW) as a Feodor Lynen Fellow and became a lecturer in 2015. He is currently an Emmy Noether-Group leader in Karlsruhe Institute of Technology (KIT) as well as an Adjunct Senior Lecturer in UNSW. Dr Hinterstein’s research interest is mainly in the microstructural analysis using various diffraction techniques. So far, he has published over 40 peer-reviewed papers and been cited over 800 times. He has been awarded several awards regarding the outstanding contributions in interpreting the strain mechanism of piezoelectric materials.