Ramp compression of magnesium oxide to 234 GPa

18th APS-SCCM; 24th AIRAPT

Wang, J.^1 ; Smith, R.F.^2 ; Coppari, F.^2 ; Eggert, J.H.^2 ; Boehly, T.R.^3 ; Collins, G.W.^2 ; Duffy, T.S.^1

Department of Geosciences, Princeton University, Princeton

NJ

08544, United States^1

Lawrence Livermore National Laboratory, PO Box 808, Livermore

CA

94550, United States^2

Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester

NY

14623-1299, United States^3

关键词: Density response;    Equation of state;    Free surface velocity;    Lagrangian analysis;    OMEGA Laser Facility;    Propagation distances;    Wet etching techniques;    X-ray diffraction measurements;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/500/6/062002/pdf
DOI  :  10.1088/1742-6596/500/6/062002

来源: IOP

【 摘 要 】

Single-crystal magnesium oxide (MgO) samples were ramp compressed to above 200 GPa pressure at the Omega laser facility. Multi-stepped MgO targets were prepared using lithography and wet etching techniques. Free surface velocities of ramp-compressed MgO were measured with a VISAR. The sound velocity and stress-density response were determined using an iterative Lagrangian analysis. The measured equation of state is consistent with expectations from previous shock and static data as well as with a recent X-ray diffraction measurement under ramp loading. The peak elastic stresses observed in our samples have amplitudes of 3-5.5 GPa, decreasing with propagation distance.