High Pressure, Materials, Matter at Extreme States

Dhiren Pradhan is a postdoctoral associate working with Ronald Cohen. His works involve experiments on ferroelectrics, piezoelectrics, hyperferroelectrics and magnetoelectric materials.  He recently completed his Ph.D. in Chemical Physics from the University of Puerto Rico,USA.

High Pressure, Matter at Extreme States

Washington, DC—Recovered minerals that originated in the deep mantle can give scientists a rare glimpse into the dynamic processes occurring deep inside of the Earth and into the history of the planet’s mantle layer. A team led by the Geophysical Laboratory's Yingwei Fei, a experimental petrologist, and Cheng Xu, a field geologist from Peking University, has discovered that a rare sample of the mineral majorite originated at least 235 miles below Earth’s surface.

High Pressure, Materials

Washington, DC—It would be difficult to overestimate the importance of silicon when it comes to computing, solar energy, and other technological applications. (Not to mention the fact that it makes up an awful lot of the Earth’s crust.) Yet there is still so much to learn about how to harness the capabilities of element number 14.

The most-common form of silicon crystallizes in the same structure as diamond. But other forms can be created using different processing techniques. New work led by the Geophysical Laboratory's Tim Strobel and published in Physical Review Letters shows that one form of silicon, called Si-III (or sometimes BC8), which is synthesized using a high-pressure process, is what’s called a narrow band gap semiconductor.

High Pressure

Washington, DC—Hydrogen is both the simplest and the most-abundant element in the universe, so studying it can teach scientists about the essence of matter. And yet there are still many hydrogen secrets to unlock, including how best to force it into a superconductive, metallic state with no electrical resistance.

High Pressure

Washington, DC— New work from a team including the Geophysical Laboratory's Guoyin Shen and Yoshio Kono used high pressure and temperature to reveal a kind of “structural memory” in samples of the metal bismuth, a discovery with great electrical engineering potential.

Bismuth is a historically interesting element for scientists, as a number of important discoveries in the metal physics world were made while studying it, including important observations about the effect of magnetic fields on electrical conductivity. 

High Pressure

The Geophysical Laboratory's weekly seminar series continues with Johnny Zhang of Scripps.  He will present, "Experiments on Fe-Ni-S Liquid with Silicate Solids under Mantle Conditions: Implications for Deep Carbon, Primordial Components and LLSVPs

High Pressure, Materials

The Geophysical Laboratory's weekly seminar series continues with our own Sergey Lobanov.  He will present, "Peeking into the color of the lower mantle: Optical studies of minerals at high P/T.”

High Pressure, Materials, Matter at Extreme States

Amol Karandikar is a postdoctoral associate working with Tim Strobel and Reinhard Boehler.  Amol is working on material synthesis and phase stability of carbon/hydrogen rich compounds and light element transport in metals.

High Pressure

The Geophysical Laboratory's weekly seminar series continues with Ercan Alp of Argonne National Laboratory.  He will present, "Recent Advances in Nuclear Resonant Scattering Under High Pressure.”

Planetary Science

The Geophysical Laboratory's weekly seminar series continues with Burkhard Militzer of UC Berkeley. He will present, "Ab initio simulations of liquids and solids at high pressure."

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