Unveiling the effect of Ni on the formation and structure of Earth's inner core
Fuente:
arXiv
Gespeichert in:
| Hauptverfasser: | , , , , , , , |
|---|---|
| Format: | Preprint |
| Veröffentlicht: |
2023
|
| Schlagworte: | |
| Online-Zugang: | |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| _version_ | 1866911760662921216 |
|---|---|
| author | Sun, Yang Mendelev, Mikhail I. Zhang, Feng Liu, Xun Da, Bo Wang, Cai-Zhuang Wentzcovitch, Renata M. Ho, Kai-Ming |
| author_facet | Sun, Yang Mendelev, Mikhail I. Zhang, Feng Liu, Xun Da, Bo Wang, Cai-Zhuang Wentzcovitch, Renata M. Ho, Kai-Ming |
| contents | Ni is the second most abundant element in the Earth's core. Yet, its effects on the inner core's structure and formation process are usually disregarded because of its electronic and size similarity with Fe. Using ab initio molecular dynamics simulations, we find that the bcc phase can spontaneously crystallize in liquid Ni at temperatures above Fe's melting point at inner core pressures. The melting temperature of Ni is shown to be 700-800 K higher than that of Fe at 323-360 GPa. hcp, bcc, and liquid phase relation differ for Fe and Ni. Ni can be a bcc stabilizer for Fe at high temperatures and inner core pressures. A small amount of Ni can accelerate Fe's crystallization at core pressures. These results suggest Ni may substantially impact the structure and formation process of the solid inner core. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2308_04280 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Unveiling the effect of Ni on the formation and structure of Earth's inner core Sun, Yang Mendelev, Mikhail I. Zhang, Feng Liu, Xun Da, Bo Wang, Cai-Zhuang Wentzcovitch, Renata M. Ho, Kai-Ming Materials Science Geophysics Ni is the second most abundant element in the Earth's core. Yet, its effects on the inner core's structure and formation process are usually disregarded because of its electronic and size similarity with Fe. Using ab initio molecular dynamics simulations, we find that the bcc phase can spontaneously crystallize in liquid Ni at temperatures above Fe's melting point at inner core pressures. The melting temperature of Ni is shown to be 700-800 K higher than that of Fe at 323-360 GPa. hcp, bcc, and liquid phase relation differ for Fe and Ni. Ni can be a bcc stabilizer for Fe at high temperatures and inner core pressures. A small amount of Ni can accelerate Fe's crystallization at core pressures. These results suggest Ni may substantially impact the structure and formation process of the solid inner core. |
| title | Unveiling the effect of Ni on the formation and structure of Earth's inner core |
| topic | Materials Science Geophysics |
| url | https://arxiv.org/abs/2308.04280 |