Diamond Formation in Reshocked Epoxy

ORAL

Abstract

We present measurements of diamond formation in doubly shocked Stycast 1266 epoxy (comprising C, H, Cl, N, and O) using in-situ x-ray diffraction. Epoxy samples were reshocked against a LiF window to 80 and 148 GPa in experiments at the Omega Laser Facility. The pressure and temperature conditions were diagnosed in situ using velocimetry and optical pyrometry, respectively. X-ray diffraction patterns of the compressed epoxy are consistent with cubic diamond. These results, in combination with previous works on CH, CH2, CH4, and methane hydrate, indicate that diamond formation from carbon and hydrogen-based compounds is commonplace at the extreme conditions associated with ice giant planet interiors and that the chemical composition, thermodynamic compression path, and kinetics play an important role.

*This material is based upon work supported by the Department of Energy National Nuclear Security Administration under Grant No. DE-NA0003856 and performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract No. DE-AC52-07NA27344.

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Publication: M. C. Marshall et. al, J. Appl. Phys. 131, 085904 (2022).

Presenters

  • Michelle C Marshall

    • University of Rochester

Authors

  • Michelle C Marshall

    • University of Rochester

  • Martin G Gorman

    • Lawrence Livermore Natl Lab

  • Danae Polsin

    • Laboratory for Laser Energetics
    • University of Rochester

  • Jon H Eggert

    • Lawrence Livermore Natl Lab

  • Mary Kate Ginnane

    • University of Rochester

  • J. Ryan Rygg

    • University of Rochester
    • Laboratory for Laser Energetics, University of Rochester

  • Gilbert W Collins

    • University of Rochester Laboratory for Laser Energetics
    • University of Rochester
    • University of Rochester, Laboratory for Laser Energetics
    • Laboratory for Laser Energetics, University of Rochester

  • Lara Leininger

    • Lawrence Livermore Natl Lab