Dr. Zhaodong Liu [Bayerisches Geoinstitut, University of Bayreuth, Germany]

Title: High pressure technique in a large volume Kawai type multianvil press and its application in geophysics

Time: 10:00 - 11:00 AM, Friday, January 13, 2017

Place: Conference room C206, HPSTAR (Beijing)

Host: Dr. Huiyang Gou and Dr. Kuo Li

Abstract

Developments of high-pressure techniques using sintered diamond (SD) and tungsten carbide (WC) anvils combined with in situ synchrotron X-ray diffraction observations in a multi-anvil apparatus enable precise determinations of high-pressure phase transitions to be performed at pressures up to 60 GPa and temperatures up to 2273 K, equivalent to intermediate regions of the lower mantle (Tange et al., 2008, 2009). Applying this high-pressure technique, we conducted a series of high-pressure and high-temperature experiments to clarify  Al2O3 solubility in bridgmanite up to the lower mantle conditions using in situ synchrotron X-ray diffraction measurements combined with sintered diamond (SD) anvils in a multi-anvil apparatus.

At pressure above 27 GPa, the coexisting mineral assemblage is aluminous bridgmanite and Al2O3 corundum. It is found that the solubility of Al2O3 in bridgmanite are significantly dependent on temperature and pressure: the solubility of Al2O3 in bridgmanite increases from 9 mol% at 1700 K to 22 mol% at 2500 K under ~ 27 GPa; bridgmanite becomes more aluminous with increasing pressure up to 48 GPa at 1700 K, from 9 mol% at 27 GPa to ~ 24 mol% at 48 GPa.Bridgmanite is the dominant host mineral for Al2O3 in the peridotitic or pyrolitic compositions under the pressure and temperature conditions of the Earth’s lower mantle.

Biography of the Speaker:

Postdoc Fellowship, 1st, Dec., 2015-Now, Bayerisches Geoinstitut, University of Bayreuth, Germany
Ph.D, Sep., 2015 - Sep., 2012, Geophysics Sciences, Geodynamics Research Center，Ehime University, Japan.
M.Sc, Sep., 2009 - Jul., 2012，Condensed Matter Physics, State Key Laboratory of Superhard Materials, Jilin University, China
B.Sc., Sep., 2005 - Jul., 2009，Physics, Weifang University, China