24. 01. 2024, 13:00

Defects, multi-properties coupling and giant electro-mechanical response in complex materials

Video
Dragan Damjanovic
24. 01. 2024, 13:00

Defects, multi-properties coupling and giant electro-mechanical response in complex materials

Video
Prof. dr. Dragan Damjanovic
Institute of Materials, Ecole polytechnique fédérale de Lausanne (EPFL), Lausanne, Switzerland
Dragan Damjanovic is an emeritus professor at EPFL in Lausanne, Switzerland. Until a year ago, he led the group for ferroelectrics and functional oxides at the Institute of Materials, EPFL, and taught courses on the structure and electrical properties of materials. He is the recipient of numerous awards, including the award for the best lecturer in the field of materials.

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 a few other materials. 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. I will relate these findings to recent reports on a giant electro-mechanical response. Finally, I will provide a general comment on the communication of unusual results in scientific publications.

Dragan Damjanovic
Prof. dr. Dragan Damjanovic
Institute of Materials, Ecole polytechnique fédérale de Lausanne (EPFL), Lausanne, Switzerland
Dragan Damjanovic is an emeritus professor at EPFL in Lausanne, Switzerland. Until a year ago, he led the group for ferroelectrics and functional oxides at the Institute of Materials, EPFL, and taught courses on the structure and electrical properties of materials. He is the recipient of numerous awards, including the award for the best lecturer in the field of materials.

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