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CM Seminar: Dr. Tina Rost, High Entropy Ceramics: Investigating localized structural effects on emerging properties

September 29 @ 10:00 am - 11:00 am

Speaker: Dr. Tina Rost

Date: Thursday September 29 2022

Time: 10:00 am – 11:00 AM PST

Location: Zoom

Zoom Link: https://ubc.zoom.us/j/64243489212?pwd=YkFSMDdxN3Nhbm15aExBdTF6MnBvQT09

Meeting ID: 642 4348 9212

Passcode: 742838

 

Abstract

Many properties we observe in materials are a direct consequence of their composition and local structure. High entropy materials are a unique class of systems that do not have a primary composition; rather they contain a near-equimolar distribution of several elements— where no single element serves as host. Such compositional disorder is accompanied by a unique distribution of localized structural distortions that can have a profound effect on properties such as thermal conductivity, magnetic interaction, diffusion, and more. To date, high entropy metals and ceramics are gaining significant traction in the materials community as unique and interesting properties continue to emerge, from amorphous-like thermal conductivities to exotic magnetic states. In this talk, we present and discuss ongoing work on the local characterization of several high entropy compositions exhibiting crystal structures from rocksalts to Kagome lattices. In particular, the use of X-ray absorption fine structure (XAFS) is demonstrated to aid in understanding such disorder on the local level and how it may influence functional properties

 

Speaker Bio

Dr. Christina Rost is currently an Assistant Professor of Physics at James Madison University in Harrisonburg, VA. She graduated with a Ph.D. in Materials Science and Engineering from North Carolina State University in 2016, following both a B.S. and an M.S. in Physics from Indiana University of Pennsylvania. Her Ph.D. focused on the development and phase-characterization of a novel class of oxide systems stabilized through configurational disorder, named “Entropy Stabilized Oxides”.   After graduation, Tina was Postdoctoral Research Associate in the Experiments and Simulations in Thermal Engineering (ExSITE) group, within the Department of Mechanical and Aerospace Engineering at the University of Virginia. There, her work focused on experimental methods to test thermal properties at extremely high temperatures and thermal transport in complex and high-entropy oxides and carbides. Currently, her all-undergraduate research group at JMU focuses efforts on complex oxide synthesis and characterization. She is an active member of the American Ceramics Society and the American Physical Society.

Details

Date:
September 29
Time:
10:00 am - 11:00 am