High Pressure Kinetics and Crystal Growth:

Materials behave differently depending on pressure and temperature as well as the rates of compression and cooling. For example, shock-induced chemistry often results in small grains or even nanoparticles of dissociated products, whereas static compression typically leads to large grains or even single crystals of associative products. Materials transform displacively at defects or along shear planes under shock compression, but diffusively at the interface under static compression. In order to gain insights of detailed material behaviors and transformations, we adapt a wide range of high pressure technologies which include both conventional static and dynamic high pressure methods, as well as recently developed dynamic-DAC.

This project is currently funded by:

• ACS-PRF (49207-ND10) for High Pressure Kinetic Studies of Formation, Phase Transition, and Crystal Growth of Methane Hydrates in Dynamic-DAC,
• CDAC_DOE-NNSA on Novel Structure, Strain and Stability of Carbon under Extreme Pressure

References:

• Solidification and fcc- to Metastable hcp- Phase Transition in Krypton under Variable Compression Rates, Jing-Yin Chen, Choong-Shik Yoo, William J. Evans, Hanns-Peter Liermann, Hyunchae Cynn, Minseob Kim, and Zsolt Jenei, Phys. Rev. B 90, 144104 (2014).
• Solidification and Crystal Growth of Highly Compressed Hydrogen and Deuterium: Time-Resolved Study under Ramp Compression in Dynamic-Diamond Anvil Cell, Dane Tomasino and Choong-Shik Yoo, Appl. Phys. Lett. 103, 061905 (2013).
• Formation and Phase Transitions of Methane Hydrates under Dynamic Loadings: Compression Rate Dependent Kinetics, Jing-Yin Chen and Choong-Shik Yoo, J. Chem. Phys. 136, 114513 (2012).
• High Density Amorphous Ice above the Critical Temperature, Jing-Yin Chen and Choong-Shik Yoo, Proc. Nat. Acad. Sci., USA 108, 7685 (2011).
• Dynamic pressure-induced growth of ice VI: Observation of Dendrite Growth and Shock Crystal Growth, Geun-woo Lee, William Evans, Choong-Shik Yoo, Pro. Nat. Acad. Sci. 104, 9178 (2007).

• Dynamic Diamond Anvil Cell (dDAC): A Novel Device for Studying the Dynamic-Pressure Properties of Materials, William J. Evans, Choong-Shik Yoo, Geun Woo Lee, Hyunchae Cynn, Magnus J. Lipp and Ken Visbeck, Rev. Sci. Instrum. 78, 073904 (2007).

• Evidence for Ice VII-like Order of High Density Water in Dynamic Diamond Anvil Cell, Geunwoo Lee, William Evans, Choong-Shik Yoo, Phys. Rev. B 74, 134112 (2006).