Dr. Sean R. Shieh [University of Western Ontario, Canada]

Title: Material under Pressure: Recent progress on carbon-bearing materials and oxides

Time: 10:30 - 11:30 AM, Monday, August 8, 2016

Place: Conference Room C206, HPSTAR (Beijing)

Host: Dr. Haozhe Liu

Abstract:

When material is subjected to high pressure, its physical properties may be altered to accommodate new environments.  Therefore, high pressure behaviors of mattes are of great interest to Earth and planetary science, physics, chemistry and material sciences.  Recent studies on carbon-bearing materials such as carbon dioxides and graphite show the soft materials with sp2 bonds may transform to a strong material with framework-like sp3 bonds at high pressures. However, there are also several metastable phases found on carbon-bearing materials  at high pressures through different paths.  It is therefore important to explore the truly stable phase at extreme pressure and/or temperature conditions using the promising tools. In this presentation, high pressure study on carbon-bearing materials and other oxides using synchrotron facilities will be presented and their high pressure behaviors will be discussed as well.

Biography of the Speaker:

Dr. Sean R. Shieh is an Associate Professor of Department of Earth Science and Department of Physics and Astronomy at the University of Western Ontario. He received his Ph.D. degree from University of Hawaii at Manoa in 1998. He was the predoctoral and postdoctoral fellow of Geophysical Laboratory, Carnegie Institute of Washington. In 2000, he joined the Department of Geosciences at Princeton University as Research Associate. He became an Assistant Professor of Department of Earth Sciences, National Cheng Kung University in 2003. He was a Visiting Professor at Tohoku University in 2011 and a Visiting Scholar at Carnegie Institute of Washington in 2012.

Awards, Fellowship, Scholarship

• Faculty Scholar Award, Western, 2015

• Early Researcher Award, Ontario, 2007

• Predoctoral Fellowship at Geophysical Laboratory, 1997

• Sigma Xi Society Award, 1996

Current research program

Our research focuses on characterization and synthesis of materials under extreme conditions (i.e. pressure to but not limited to 200 GPa and temperature to 3000 K). We are particularly interested in the elastic, electronic and mechanic properties of materials using synchrotron-based facilities and in-house Raman and infrared spectroscopy. Our on-going projects includes (1) synthesis and characterization of carbon-, hydrogen- and nitrogen-based materials, (2) development and applications of synchrotron radiation at the Canadian Light Source, Saskatoon, the Advanced Photon Source at Argonne National Laboratory and SPring-8. (3) Characterizations of important Earth and planetary materials using microprobes, spectroscopy and synchrotron radiations.