报告题目：Defects and multi-properties coupling in complex materials

报告时间：2024年10月23日上午10:30

报告人：Prof. Dragan Damjanovic

报告地点：清华大学逸夫技术科学楼A205学术报告厅

邀请人：王轲老师

报告简介：

In materials with complex chemistry, even a small concentration of defects may lead to a heterogeneous mesostructure and properties that differ from what is expected based on the material's nominal crystal structure. One intriguing outcome of this complexity is the emergence of properties forbidden by the material's nominal, average symmetry. In this talk, I will discuss doped CeO2, along with hybrid, ortganommetalic halide perovskites. Although compositionally simple, doped CeO2 exhibits a complex defect structure that can be manipulated by external electrical and mechanical fields, resulting in symmetry-forbidden electrical polarity and electro-chemo-thermo-mechanical coupling. Similar effects appear in hybrid perosvkites with addition of photo-mechanical effects.

报告人简介：

Dragan Damjanovic earned a BSc diploma in Physics from the Faculty of Natural Sciences and Mathematics at the University of Sarajevo in 1980 and a PhD in Ceramics Science from the Department of Materials Science and Engineering at the College of Earth and Mineral Sciences, Pennsylvania State University (PSU) in 1987. From 1988 to 1991, he worked as a research associate at the Materials Research Laboratory at PSU. In 1991, he joined the Ceramics Laboratory in the Department of Materials Science and Engineering at Ecole polytechnique fédérale de Lausanne (EPFL). During his time there, he led the Group for Ferroelectrics and Functional Oxides at the Institute of Materials, and taught undergraduate and graduate courses on the structure and electrical properties of materials. His research focused on fundamental and applied investigations of the piezoelectric, ferroelectric, and dielectric properties of a wide range of materials. He retired from EPFL in March 2022.