X-ray free electron laser-induced synthesis of ε-iron nitride at high pressures

X-ray free electron laser-induced synthesis of ε-iron nitride at high pressures

<p>The ultrafast synthesis of ε-Fe<sub>3</sub>N<sub>1+<em>x</em></sub> in a diamond-anvil cell (DAC) from Fe and N<sub>2</sub> under pressure was observed using serial exposures of an X-ray free electron laser (XFEL)...

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Bibliographic Details
Main Authors:	Hwang, H, Kim, T, Cynn, H, Vogt, T, Husband, RJ, Appel, K, Baehtz, C, Ball, OB, Baron, MA, Briggs, R, Bykov, M, Bykova, E, Cerantola, V, Chantel, J, Coleman, AL, Dattlebaum, D, Dresselhaus-Marais, LE, Eggert, JH, Ehm, L, Evans, WJ, Fiquet, G, Frost, M, Glazyrin, K, Goncharov, AF, Jenei, Z, Kim, J, Konôpková, Z, Mainberger, J, Makita, M, Marquardt, H, McBride, EE, McHardy, JD, Merkel, S, Morard, G, O'Bannon, EF, Otzen, C, Pace, EJ, Pelka, A, Pépin, CM, Pigott, JS, Prakapenka, VB, Prescher, C, Redmer, R, Speziale, S, Spiekermann, G, Strohm, C, Sturtevant, BT, Velisavljevic, N, Wilke, M, Yoo, C-S
Format:	Journal article
Language:	English
Published:	American Chemical Society 2021

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Summary:	<p>The ultrafast synthesis of ε-Fe<sub>3</sub>N<sub>1+<em>x</em></sub> in a diamond-anvil cell (DAC) from Fe and N<sub>2</sub> 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 <em>in situ</em> transformation of α- to γ-iron. Ultimately, the Fe and N<sub>2</sub> reacted uniformly throughout the beam path to form Fe<sub>3</sub>N<sub>1.33</sub>, 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 the time-dependence of reactions under high-pressure conditions.</p>