Article Dans Une Revue Science Advances Année : 2022

Diamond formation kinetics in shock-compressed C─H─O samples recorded by small-angle x-ray scattering and x-ray diffraction

Armin Bergermann
Deniza Chekrygina
Adrien Descamps
Martin French
Eric Galtier
Arianna Gleason
Griffin Glenn
Siegfried Glenzer
Nicholas Hartley
Oliver Humphries
Nobuki Kamimura
Kento Katagiri
Dimitri Khaghani
Hae Ja Lee
Emma Mcbride
Kohei Miyanishi
Silvia Pandolfi
Chongbing Qu
Ronald Redmer
Anja Schuster
Keiichi Sueda
Katja Voigt
Jan Vorberger
Lisa Zinta

Résumé

Extreme 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 2 O systems, respectively. Here, we investigate a stoichiometric mixture of C and H 2 O by shock-compressing polyethylene terephthalate (PET) plastics and performing in situ x-ray probing. We observe diamond formation at pressures between 72 ± 7 and 125 ± 13 GPa at temperatures ranging from ~3500 to ~6000 K. Combining x-ray diffraction and small-angle x-ray scattering, we access the kinetics of this exotic reaction. The observed demixing of C and H 2 O 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. Moreover, our measurements indicate a way of producing nanodiamonds by simple laser-driven shock compression of cheap PET plastics.
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hal-04946776 , version 1 (13-02-2025)

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Zhiyu He, Melanie Rödel, Julian Lütgert, Armin Bergermann, Mandy Bethkenhagen, et al.. Diamond formation kinetics in shock-compressed C─H─O samples recorded by small-angle x-ray scattering and x-ray diffraction. Science Advances , 2022, 8 (35), pp.eabo0617. ⟨10.1126/sciadv.abo0617⟩. ⟨hal-04946776⟩
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