Physics Colloquium: Miaofang Chi

When

Feb. 7, 2020, 3:45pm to 4:45pm

Campus Location

Office/Remote Location

Room 217

Description

Miaofang Chi, a research staff member in the Center for Nanophase Materials Sciences at Oak Ridge National Laboratory, will be the featured speaker at an upcoming Department of Physics and Astronomy colloquium. Her talk is titled, "Understanding Interfaces via Probing Ions and Electrons in a STEM."

In spite of various physical and chemical properties, materials’ function is defined at the level of electrons and atoms. Electron microscopy has experienced significant technical developments in the past decades and now is powerful in revealing the atomic arrangements and identify chemical species of single atoms. This capability is especially crucial in studying and designing functional nanofeatures, such as interfaces, grain boundaries and point defects in energy and quantum materials, where these nanofeatures often introduce exotic chemical and physical properties that are inaccessible in their bulk counterparts. Very recently, new microscopy techniques, especially four-dimensional scanning transmission electron microscopy (4D-STEM) imaging, has opened a new era of characterizations in a STEM where not only single atoms can be imaged, but also the electron distributions at the sub-Å scale in real space. In this talk, Chi will first demonstrate the applications of the state-of-art and in situ STEM imaging for battery materials, by giving couple of examples on revealing ion transport and stability at the interfaces of solid electrolytes; then she will introduce 4D-STEM and differential phase contrast (DPC) imaging techniques, focusing on their capabilities in revealing electron distributions in materials. Examples of imaging electron distributions in electrides will be given.

There will be refreshments starting at 3:30 p.m.

Admission Information

Admission is free and open to all.

Contact Information

External Sponsor

Department of Physics and Astronomy