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."

Washington, DCIn Earth’s interior, water (H2O) plays an important role in rock physics, but geoscientists rarely treat water in its constituent forms, that is as hydrogen plus oxygen. New work from a team led by the Geophysical Laboratory's Dave Mao has identified that hydrogen can escape from the water under conditions found in Earth’s lower mantle leading to a new paradigm in lower mantle chemistry. Their results were published in Proceeding of the National Academic Science, U.S.A.

High Pressure, Matter at Extreme States

Washington, DC— Although helium is the second most-abundant element (after hydrogen) in the universe, it doesn’t play well with others. It is a member of a family of seven elements called the noble gases, which are called that because of their chemical aloofness—they don’t easily form compounds with other elements. Helium, widely believed to be the most inert element, has no stable compounds under normal conditions. 

High Pressure

Yingwei Fei, a high-pressure experimentalist at the Geophysical Laboratory, and Peter Driscoll, a theoretical geophysicist at the Department of Terrestrial Magnetism, have been awarded a Carnegie Science Venture Grant for their project “Direct Shock Compression of Pre-synthesized Mantle Mineral to Super-Earth Interior Conditions.”

High Pressure

Washington, DCPhase transitions surround us—for instance, liquid water changes to ice when frozen and to steam when boiled. Now, researchers at the Geophysical Laboratory have discovered a new phenomenon of so-called metastability in a liquid phase. A metastable liquid is not quite stable. This state is common in supercooled liquids, which are liquids that cool below the freezing point without turning into a solid or a crystal.

High Pressure

The Geophysical Laboratory's weekly seminar series continues with Arianna Gleason from Stanford University.  She will present, "Ultrafast X-ray Studies on the Dynamics of Transitions in Planetary Materials."

High Pressure

Zhenxian Liu is beamline scientist at the Carnegie synchrotron infrared beamline U2A of the National Synchrotron Light Source (NSLS), Brookhaven National Laboratory.

High Pressure, Materials

Washington, DC—Germanium may not be a household name like silicon, its group-mate on the periodic table, but it has great potential for use in next-generation electronics and energy technology.

Of particular interest are forms of germanium that can be synthesized in the lab under extreme pressure conditions. However, one of the most-promising forms of germanium for practical applications, called ST12, has only been created in tiny sample sizes—too small to definitively confirm its properties.

High Pressure

The Geophysical Laboratory's weekly seminar series continues with June Wicks from Princeton University.  She will present, "From Super-earth interiors to our own earth’s surface: using dynamic compression to study our universe."

High Pressure

The Geophysical Laboratory's weekly seminar series continues with Kate Kiseeva from the University of Oxford.  She will present, "Diamond inclusions from the Earth’s transition zone."

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