Formation of Iron-Helium Compounds under High Pressure
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arXiv
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| Auteurs principaux: | , , , , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866912112633184256 |
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| author | Takezawa, Haruki Hsu, Han Hirose, Kei Sakai, Fumiya Fu, Suyu Gomi, Hitoshi Miwa, Shiro Sakamoto, Naoya |
| author_facet | Takezawa, Haruki Hsu, Han Hirose, Kei Sakai, Fumiya Fu, Suyu Gomi, Hitoshi Miwa, Shiro Sakamoto, Naoya |
| contents | We report the formations of fcc and distorted hcp iron-helium compounds with x in FeHex up to 0.13 and 0.48, respectively, based on experiments at 5-54 GPa and ~1000-2820 K. Upon releasing pressure under room temperature, these fcc and distorted hcp FeHex were still observed by XRD and SIMS measurements. Our first-principles calculations indicate that fcc and hcp FeHex, with helium atoms occupying the tetrahedral and trigonal-planar interstitial sites (instead of the octahedral sites), are dynamically stable throughout 0-50 GPa. These results support that the Earth's core can be a large reservoir of primordial 3He. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_11810 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Formation of Iron-Helium Compounds under High Pressure Takezawa, Haruki Hsu, Han Hirose, Kei Sakai, Fumiya Fu, Suyu Gomi, Hitoshi Miwa, Shiro Sakamoto, Naoya Materials Science Other Condensed Matter We report the formations of fcc and distorted hcp iron-helium compounds with x in FeHex up to 0.13 and 0.48, respectively, based on experiments at 5-54 GPa and ~1000-2820 K. Upon releasing pressure under room temperature, these fcc and distorted hcp FeHex were still observed by XRD and SIMS measurements. Our first-principles calculations indicate that fcc and hcp FeHex, with helium atoms occupying the tetrahedral and trigonal-planar interstitial sites (instead of the octahedral sites), are dynamically stable throughout 0-50 GPa. These results support that the Earth's core can be a large reservoir of primordial 3He. |
| title | Formation of Iron-Helium Compounds under High Pressure |
| topic | Materials Science Other Condensed Matter |
| url | https://arxiv.org/abs/2405.11810 |