Direct shock compression of pre-synthesized high-pressure silicates: Implication for internal structure of super-Earth
COFFEE_KLATCH · Invited
Abstract
Accurate measurements of the equation of state of silicate to terapascal pressure range are essential for modeling the silicate mantle of super-Earths. Using the Sandia Z-machine, my collaborators and I have performed direct shockwave loading of pre-synthesized MgSiO$_{\mathrm{3}}$-bridgmanite up to a shock velocity of 24 km/s. The large dense MgSiO$_{\mathrm{3}}$-bridgmanite samples were synthesized in the multi-anvil press using 1-inch sintered-diamond cubes, and then prepared for Z-shots. In this presentation I will describe the experimental procedure and present the Hugoniot data up to 1.2 TPa, and compare the new Z experiment data to the DFT-MD calculations. Finally, I will discuss the implications for interior structure of the observed super-Earths.
*This work is supported by the Z Fundamental Science Program at Sandia National Laboratories and the Carnegie Venture Grant. Collaborators include C.T. Seagle, J. P. Townsend, L. Shulenburger, M. Furnish from SNL, and A. Boujibar, P. Driscoll from Carnegie. SNL is managed and operated by NTESS under DOE NNSA contract DE-NA0003525
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