PMI/PCCM SEMINAR SERIES SPRING 2024: Elizabeth Dickey, Carnegie Mellon University

Mar 20, 2024, 12:00 pm1:00 pm


Event Description

Local to Meso-scale Order in Non-Linear Dielectrics Characterized by Scanning Transmission Electron Microscopy

Abstract: The ability to design the composition and microstructure of electronic ceramics for emerging technological applications requires sophisticated characterization techniques that can provide quantitative information about local structure and chemistry. Such structure quantification is particularly important to the fundamental understanding of properties in many important non-linear dielectrics, where chemical heterogeneities associated with dopants or intrinsic lattice defects give rise to local inhomogeneities in charge, strain and polarization.  Such local deviations from the global average structure and symmetry are often linked to enhancements in macroscopic dielectric and electromechanical properties. This seminar discusses the use of scanning transmission electron microscopy (STEM) to quantify short- and medium-range lattice disorder in electronic oxides, including antiferroelectrics, ferroelectrics and relaxor ferroelectrics.  The ability to quantify local structure on a sublattice basis and in real space provides unique insight into the polarization of these materials.

Bio: Elizabeth Dickey is the Teddy & Wilton Hawkins Distinguished Professor and Department Head of Materials Science & Engineering at Carnegie Mellon University. Her research aims to develop processing-structure-property relationships for materials in which the macroscopic physical properties are governed by point defects, grain boundaries or internal interfaces. Early in her career she received the Presidential Early Career Award for Scientists and Engineers (PECASE) for her work on metal-ceramic interfaces. She was awarded the Fulrath Award and Sosman Awards by the American Ceramic Society in recognition of her research on characterization of functional ceramics and composites. Professor Dickey is a fellow of the American Ceramic Society, the Microscopy Society of America and AAAS. She is also a past-president of the American Ceramic Society.

All seminars are held on Wednesdays from 12:00 noon-1:00 p.m. in the Bowen Hall Auditorium Room 222. A light lunch is provided at 11:30 a.m. in the Bowen Hall Atrium immediately prior to the seminar.