CANCELLED - Materials Science and Engineering Seminar Series presents Prof. Judy Cha from Yale University

Thursday, March 19, 2020 at 4:00pm to 5:00pm

Massachusetts Institute of Technology, 6-104 77 Massachusetts Ave., 6-104, Cambridge, MA 02139

The Materials Science and Engineering Seminar Series presents Prof. Judy Cha from Yale University.

Phase Transformations of Nanoscale Systems Using In Situ TEM
Many nanoscale systems undergo phase transformations in response to stimuli, which subsequently change the properties of the systems, which provides opportunities to create smart devices. Here, Prof. Cha’s lab employs in situ transmission electron microscopy (TEM) to study how phase transformations
occur and deviate and how they are controlled at the nanoscale under electrical biasing, heating, and cooling; and to examine their effect on materials properties.

Prof. Cha will discuss three examples of phase transformation:
IBM’s confined phase change memory (PCM) cells with a surfactant layer, which showed a record endurance of 2x1012 programming cycles; metallic glass nanostructures that are crystallized to test the limits of classical nucleation theories; and the ferroelectric transition of topological crystalline insulator SnTe nanowires, which has implications for the recently observed novel superconductivity. In all three examples, in situ TEM investigations reveal detailed and unexpected phenomena and rich structural and chemical heterogeneities, guiding researchers to build of better models and theories for nanoscale phase transformations.

Prof. Cha also hopes to discuss her lab’s recent results on the phase transformations of two-dimensional transition metal dichalcogenides induced by electrochemical intercalation of Li+ and their energy applications.

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