TY  - JOUR
AU  - Frost, Mungo
AU  - McWilliams, R. Stewart
AU  - Bykova, Elena
AU  - Bykov, Maxim
AU  - Husband, Rachel J.
AU  - Andriambariarijaona, Leon M.
AU  - Khandarkhaeva, Saiana
AU  - Massani, Bernhard
AU  - Appel, Karen
AU  - Baehtz, Carsten
AU  - Ball, Orianna B.
AU  - Cerantola, Valerio
AU  - Chariton, Stella
AU  - Choi, Jinhyuk
AU  - Cynn, Hyunchae
AU  - Duff, Matthew J.
AU  - Dwivedi, Anand
AU  - Edmund, Eric
AU  - Fiquet, Guillaume
AU  - Graafsma, Heinz
AU  - Hwang, Huijeong
AU  - Jaisle, Nicolas
AU  - Kim, Jaeyong
AU  - Konôpková, Zuzana
AU  - Laurus, Torsten
AU  - Lee, Yongjae
AU  - Liermann, Hanns-Peter
AU  - McHardy, James D.
AU  - McMahon, Malcolm I.
AU  - Morard, Guillaume
AU  - Nakatsutsumi, Motoaki
AU  - Nguyen, Lan Anh
AU  - Ninet, Sandra
AU  - Prakapenka, Vitali B.
AU  - Prescher, Clemens
AU  - Redmer, Ronald
AU  - Stern, Stephan
AU  - Strohm, Cornelius
AU  - Sztuk-Dambietz, Jolanta
AU  - Turcato, Monica
AU  - Wu, Zhongyan
AU  - Glenzer, Siegfried H.
AU  - Goncharov, Alexander F.
TI  - Diamond precipitation dynamics from hydrocarbons at icy planet interior conditions
JO  - Nature astronomy
VL  - 8
IS  - 2
SN  - 2397-3366
CY  - London
PB  - Nature Publishing Group
M1  - PUBDB-2024-01494
SP  - 174-181
PY  - 2024
AB  - The pressure and temperature conditions at which precipitation of diamond occurs from hydrocarbon mixtures is important for modelling the interior dynamics of icy planets. However, there is substantial disagreement from laboratory experiments, with those using dynamic compression techniques finding much more extreme conditions are required than in static compression. Here we report the time-resolved observation of diamond formation from statically compressed polystyrene, (C<sub>8</sub>H<sub>8</sub>)<sub>n</sub>, heated using the 4.5 MHz X-ray pulse trains at the European X-ray Free Electron Laser facility. Diamond formation is observed above 2,500 K from 19 GPa to 27 GPa, conditions representative of Uranus’s and Neptune’s shallow interiors, on 30 μs to 40 μs timescales. This is much slower than may be observed during the ∼10 ns duration of typical dynamic compression experiments, revealing reaction kinetics to be the reason for the discrepancy. Reduced pressure and temperature conditions for diamond formation has implications for icy planetary interiors, where diamond subduction leads to heating and could drive convection in the conductive ice layer that has a role in their magnetic fields.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:001138168700001
DO  - DOI:10.1038/s41550-023-02147-x
UR  - https://bib-pubdb1.desy.de/record/605543
ER  -