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| Autores principales: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| Materias: | |
| Acceso en línea: | https://arxiv.org/abs/2505.15397 |
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| author | Konopkova, Zuzana Edmund, Eric Ball, Orianna B Dewaele, Agnes Ginestet, Helene Husband, Rachel J Jaisle, Nicolas Strohm, Cornelius Anae, Madden S Antonangeli, Daniele Appel, Karen Baron, Marzena Boccato, Silvia Buakor, Khachiwan Chantel, Julien Cynn, Hyunchae Dwivedi, Anand P Ehm, Lars Glazyrin, Konstantin Graafsma, Heinz Koemets, Egor Laurus, Torsten Marquardt, Hauke Massani, Bernhard McHardy, James D McMahon, Malcolm I Prakapenka, Vitali Sztuk-Dambietz, Jolanta Tang, Minxue Xie, Tianqi Younes, Zena Zastrau, Ulf Goncharov, Alexander F Prescher, Clemens McWilliams, Ryan S Morard, Guillaume Merkel, Sebastien |
| author_facet | Konopkova, Zuzana Edmund, Eric Ball, Orianna B Dewaele, Agnes Ginestet, Helene Husband, Rachel J Jaisle, Nicolas Strohm, Cornelius Anae, Madden S Antonangeli, Daniele Appel, Karen Baron, Marzena Boccato, Silvia Buakor, Khachiwan Chantel, Julien Cynn, Hyunchae Dwivedi, Anand P Ehm, Lars Glazyrin, Konstantin Graafsma, Heinz Koemets, Egor Laurus, Torsten Marquardt, Hauke Massani, Bernhard McHardy, James D McMahon, Malcolm I Prakapenka, Vitali Sztuk-Dambietz, Jolanta Tang, Minxue Xie, Tianqi Younes, Zena Zastrau, Ulf Goncharov, Alexander F Prescher, Clemens McWilliams, Ryan S Morard, Guillaume Merkel, Sebastien |
| contents | The crystallographic structure of iron under extreme conditions is a key benchmark for cutting-edge experimental and numerical methods. Moreover, it plays a crucial role in understanding planetary cores, as it significantly influences the interpretation of observational data and, consequently, insights into their internal structure and dynamics. However, even the structure of pure solid iron under the Earth's core conditions remains uncertain, with the commonly expected hexagonal close-packed structure energetically competitive with various cubic lattices. In this study, iron was compressed in a diamond anvil cell to above 200 GPa, and dynamically probed near the melting point using MHz frequency X-ray pulses from the European X-ray Free Electron Laser. The emergence of an additional diffraction line at high temperatures suggests the formation of an entropically stabilized bcc structure. Rapid heating and cooling cycles captured intermediate phases, offering new insights into iron's phase transformation paths. The appearance of the bcc phase near melting at extreme pressures challenges current understanding of the iron phase diagram under Earth's core conditions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_15397 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Observation of Body-Centered Cubic Iron above 200 Gigapascals Konopkova, Zuzana Edmund, Eric Ball, Orianna B Dewaele, Agnes Ginestet, Helene Husband, Rachel J Jaisle, Nicolas Strohm, Cornelius Anae, Madden S Antonangeli, Daniele Appel, Karen Baron, Marzena Boccato, Silvia Buakor, Khachiwan Chantel, Julien Cynn, Hyunchae Dwivedi, Anand P Ehm, Lars Glazyrin, Konstantin Graafsma, Heinz Koemets, Egor Laurus, Torsten Marquardt, Hauke Massani, Bernhard McHardy, James D McMahon, Malcolm I Prakapenka, Vitali Sztuk-Dambietz, Jolanta Tang, Minxue Xie, Tianqi Younes, Zena Zastrau, Ulf Goncharov, Alexander F Prescher, Clemens McWilliams, Ryan S Morard, Guillaume Merkel, Sebastien Materials Science The crystallographic structure of iron under extreme conditions is a key benchmark for cutting-edge experimental and numerical methods. Moreover, it plays a crucial role in understanding planetary cores, as it significantly influences the interpretation of observational data and, consequently, insights into their internal structure and dynamics. However, even the structure of pure solid iron under the Earth's core conditions remains uncertain, with the commonly expected hexagonal close-packed structure energetically competitive with various cubic lattices. In this study, iron was compressed in a diamond anvil cell to above 200 GPa, and dynamically probed near the melting point using MHz frequency X-ray pulses from the European X-ray Free Electron Laser. The emergence of an additional diffraction line at high temperatures suggests the formation of an entropically stabilized bcc structure. Rapid heating and cooling cycles captured intermediate phases, offering new insights into iron's phase transformation paths. The appearance of the bcc phase near melting at extreme pressures challenges current understanding of the iron phase diagram under Earth's core conditions. |
| title | Observation of Body-Centered Cubic Iron above 200 Gigapascals |
| topic | Materials Science |
| url | https://arxiv.org/abs/2505.15397 |