Standard velocity interferometer for any reflector (VISAR) diagnostics and the recently published equation of state data for PET ( 15) are applied to estimate the P- T state of the shocked PET sample, allowing us to compare the XRD data to density functional theory molecular dynamics (DFT-MD) simulations, where they show excellent agreement. Here, the size distribution and the growth process of nanodiamonds, created from shock-compressed polyethylene terephthalate, are characterized by in situ XRD and SAXS consistently at two different XFEL facilities, which shows the importance of the pressure P–temperature T state on the diamond formation kinetics. Moreover, our measurements indicate a way of producing nanodiamonds by simple laser-driven shock compression of cheap PET plastics. The observed demixing of C and H 2O suggests that diamond precipitation inside the ice giants is enhanced by oxygen, which can lead to isolated water and thus the formation of superionic structures relevant to the planets’ magnetic fields. Combining x-ray diffraction and small-angle x-ray scattering, we access the kinetics of this exotic reaction. We observe diamond formation at pressures between 72 ± 7 and 125 ± 13 GPa at temperatures ranging from ~3500 to ~6000 K. Here, we investigate a stoichiometric mixture of C and H 2O by shock-compressing polyethylene terephthalate (PET) plastics and performing in situ x-ray probing. Zinta, Alessandra Ravasio, and Dominik Kraus Show FewerĮxtreme conditions inside ice giants such as Uranus and Neptune can result in peculiar chemistry and structural transitions, e.g., the precipitation of diamonds or superionic water, as so far experimentally observed only for pure C─H and H 2O systems, respectively. Stevenson, Keiichi Sueda, Tadashi Togashi, Tommaso Vinci, Katja Voigt, Jan Vorberger, Makina Yabashi, Toshinori Yabuuchi, Lisa M. McBride, Kohei Miyanishi, Bob Nagler, Benjamin Ofori-Okai, Norimasa Ozaki, Silvia Pandolfi, Chongbing Qu, Divyanshu Ranjan, Ronald Redmer, Christopher Schoenwaelder, Anja K. ![]() ![]() Humphries, Nobuki Kamimura, Kento Katagiri, Dimitri Khaghani, Hae Ja Lee, Emma E. Hartley, Jean-Alexis Hernandez, Benjamin Heuser, Oliver S. Cowan, … Show All …, Adrien Descamps, Martin French, Eric Galtier, Arianna E. Zhiyu He, Melanie Rödel, Julian Lütgert, Armin Bergermann, Mandy Bethkenhagen, Deniza Chekrygina, Thomas E.
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