Hwang Huijeong, Kim Taehyun, Cynn Hyunchae, Vogt Thomas, Husband Rachel J, Appel Karen, Baehtz Carsten, Ball Orianna B, Baron Marzena A, Briggs Richard, Bykov Maxim, Bykova Elena, Cerantola Valerio, Chantel Julien, Coleman Amy L, Dattlebaum Dana, Dresselhaus-Marais Leora E, Eggert Jon H, Ehm Lars, Evans William J, Fiquet Guillaume, Frost Mungo, Glazyrin Konstantin, Goncharov Alexander F, Jenei Zsolt, Kim Jaeyong, Konôpková Zuzana, Mainberger Jona, Makita Mikako, Marquardt Hauke, McBride Emma E, McHardy James D, Merkel Sébastien, Morard Guillaume, O'Bannon Earl F, Otzen Christoph, Pace Edward J, Pelka Alexander, Pépin Charles M, Pigott Jeffrey S, Prakapenka Vitali B, Prescher Clemens, Redmer Ronald, Speziale Sergio, Spiekermann Georg, Strohm Cornelius, Sturtevant Blake T, Velisavljevic Nenad, Wilke Max, Yoo Choong-Shik, Zastrau Ulf, Liermann Hanns-Peter, McMahon Malcolm I, McWilliams R Stewart, Lee Yongjae
Earth System Sciences, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea.
Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, United States.
J Phys Chem Lett. 2021 Apr 1;12(12):3246-3252. doi: 10.1021/acs.jpclett.1c00150. Epub 2021 Mar 25.
The ultrafast synthesis of ε-FeN in a diamond-anvil cell (DAC) from Fe and N 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 transformation of α- to γ-iron. Ultimately, the Fe and N reacted uniformly throughout the beam path to form FeN, 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.
利用X射线自由电子激光（XFEL）的连续曝光，观察到在金刚石对顶砧（DAC）中，铁（Fe）和氮（N）在压力下超快合成ε-FeN。当5 GPa的样品受到间隔443 ns的脉冲序列照射时，通过α-铁到γ-铁的转变证实，延迟时间处估计的样品温度高于1400 K。最终，从其已确定的状态方程（EOS）推断，Fe和N在整个光束路径中均匀反应形成FeN。因此，我们证明了XFEL中强烈X射线曝光提供的活化能可以与源时间结构相结合，从而能够探索高压条件下反应的时间依赖性。
