200 吨/平方米以上观察到体心立方铁
材料科学
2025-05-22 v1
摘要
铁的晶体结构在极端条件下的结构是尖端实验和数值方法的关键基准。此外，它在理解行星核心方面起着关键作用，因为它显著影响对观测数据解释的理解，从而导致对其内部结构和动力学的见解。然而，即使在地球核心条件下的纯固态铁结构仍不确定，常被认为的是六方单斜结构在能量上与各种立方晶格竞争。本研究将铁在金刚石单晶压到 200 GPa 以上，使用来自欧洲 X 射线自由电子激光的 MHz 频率 X 射线脉冲进行接近熔点的动态探测。高温下出现额外的衍射线，表明 bcc 结构的形成。快速的加热和冷却循环捕获了中间相，为铁的相变路径提供了新的见解。在极端压力下的熔点附近出现 bcc 相，挑战了对地球核心条件下铁相图的当前理解。
引用
@article{arxiv.2505.15397,
title = {Observation of Body-Centered Cubic Iron above 200 Gigapascals},
author = {Zuzana Konopkova and Eric Edmund and Orianna B Ball and Agnes Dewaele and Helene Ginestet and Rachel J Husband and Nicolas Jaisle and Cornelius Strohm and Madden S Anae and Daniele Antonangeli and Karen Appel and Marzena Baron and Silvia Boccato and Khachiwan Buakor and Julien Chantel and Hyunchae Cynn and Anand P Dwivedi and Lars Ehm and Konstantin Glazyrin and Heinz Graafsma and Egor Koemets and Torsten Laurus and Hauke Marquardt and Bernhard Massani and James D McHardy and Malcolm I McMahon and Vitali Prakapenka and Jolanta Sztuk-Dambietz and Minxue Tang and Tianqi Xie and Zena Younes and Ulf Zastrau and Alexander F Goncharov and Clemens Prescher and Ryan S McWilliams and Guillaume Morard and Sebastien Merkel},
journal= {arXiv preprint arXiv:2505.15397},
year = {2025}
}