X-ray Free Electron Laser-Induced Synthesis of ε- Iron Nitride at High Pressures

EuXFEL Community, Orianna Ball, James D McHardy, Edward J Pace, Malcolm I McMahon, R Stewart McWilliams

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

The ultrafast synthesis of ε-Fe3N1+x in a diamond-anvil 77 cell (DAC) from Fe and N2 under pressure was observed using serial exposures of an X-ray free electron laser (XFEL). When the sample at 5 GPa was irradiated by a pulse train separated by 443 ns, the estimated sample temperature at the delay time was above 1400 K, confirmed by in-situ transformation of α- to γ-iron. Ultimately, the Fe and N2 reacted uniformly throughout the beam path to form Fe3N1.33, as
deduced from its established equation of state (EOS). We thus demonstrate that the activation energy provided by intense X-ray exposures in an XFEL can be coupled with the source time structure to enable exploration of time-dependence of reactions under high pressure conditions.
Original languageEnglish
Pages (from-to)3246-3252
Number of pages7
JournalThe Journal of Physical Chemistry Letters
Issue number12
Early online date25 Mar 2021
Publication statusPublished - 1 Apr 2021


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