Dynamic X-ray diffraction observation of shocked solid iron up to 170 GPa

Adrien Denoeud, Norimasa Ozaki, Alessandra Benuzzi-Mounaix, Hiroyuki Uranishi, Yoshihiko Kondo, Erik Brambrink, Alessandra Ravasio, Maimouna Bocoum, Jean-Michel Boudenne, Marion Harmand, Francois Guyot, Stephane Mazevet, David Riley, Mikako Makita, Takayoshi Sano, Youichi Sakawa, Yuici Inubushi, Gianluca Gregori, Michael Koenig, Guillaume Morard

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Iron is the main constituent of the core of rocky planets; therefore, understanding its phase diagram under extreme conditions is fundamental to model the planets’ evolution. Using dynamic compression by laser-driven shocks, pressure and temperature conditions close to what is found in these cores can be reached. However, it remains unclear whether phase boundaries determined at nanosecond timescales agree with static compression. Here we observed the presence of solid hexagonal close-packed iron at 170 GPa and 4,150 K, in a part of the iron phase diagram, where either a different solid structure or liquid iron has been proposed. This X-ray diffraction experiment confirms that laser compression is suitable for studying iron at conditions of deep planetary interiors difficult to achieve with static compression techniques.
Original languageEnglish
Pages (from-to)7745-7749
Number of pages5
JournalProceedings of the National Academy of Sciences
Issue number28
Early online date28 Jun 2016
Publication statusPublished - 12 Jul 2016


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