VIRTUAL

 Thursday, April 14th    2022

3:45 – 4:45 pm (MT)

WEBEX 

 Speaker:  Sally June Tracy

Carnegie Institution for Science

“ Light-source diffraction studies of phase transitions under shock loading and release”

 

Abstract: 

Facilities that couple dynamic loading platforms with high-flux X-ray sources allow for in situ X-ray diffraction under shock compression. Such experiments can address long-standing questions concerning the stable crystallographic phases under rapid loading and release and reveal mechanistic details of shock-induced transformations. This talk will review recent x-ray free electron laser and synchrotron diffraction studies of carbonates, oxides, and fluorides under laser-based and gas-gun shock compression and discuss applications of these results to geophysics and materials science. These studies demonstrate that complex high-pressure phase transitions can be explored on nanosecond timescales, improving our understanding of the dynamic response of materials under extreme conditions.

Bio:

Sally June Tracy is a Staff Scientist at the Carnegie Institution for Science. Tracy received her Ph.D. in Materials Science from Caltech in 2016. After a postdoctoral fellowship in the Department of Geosciences at Princeton University, she joined Carnegie’s Earth and Planets Laboratory in 2019. Tracy is interested in the exploration of novel materials at high pressure and temperature. Her research spans mineral physics and materials science. She uses both static and dynamic compression techniques coupled with high-flux X-ray sources to probe structural deformation and phase transitions in materials under extreme conditions.

https://epl.carnegiescience.edu/people/sally-june-tracy