Magnesium oxide-water compounds at megabar pressure and implications on planetary interiors.
Magnesium oxide-water compounds at megabar pressure and implications on planetary interiors.
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DOI:
10.1038/s41467-023-36802-8
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发表时间:
2023-03-01
影响因子:
16.6
通讯作者:
Sun, Jian
中科院分区:
文献类型:
--
作者:
Pan, Shuning;Huang, Tianheng;Vazan, Allona;Liang, Zhixin;Liu, Cong;Wang, Junjie;Pickard, Chris J.;Wang, Hui-Tian;Xing, Dingyu;Sun, Jian
Magnesium Oxide (MgO) and water (H2O) are abundant in the interior of planets. Their properties, and in particular their interaction, significantly affect the planet interior structure and thermal evolution. Here, using crystal structure predictions and ab initio molecular dynamics simulations, we find that MgO and H2O can react again at ultrahigh pressure, although Mg(OH)2 decomposes at low pressure. The reemergent MgO-H2O compounds are: Mg2O3H2 above 400 GPa, MgO3H4 above 600 GPa, and MgO4H6 in the pressure range of 270–600 GPa. Importantly, MgO4H6 contains 57.3 wt % of water, which is a much higher water content than any reported hydrous mineral. Our results suggest that a substantial amount of water can be stored in MgO rock in the deep interiors of Earth to Neptune mass planets. Based on molecular dynamics simulations we show that these three compounds exhibit superionic behavior at the pressure-temperature conditions as in the interiors of Uranus and Neptune. Moreover, the water-rich compound MgO4H6 could be stable inside the early Earth and therefore may serve as a possible early Earth water reservoir. Our findings, in the poorly explored megabar pressure regime, provide constraints for interior and evolution models of wet planets in our solar system and beyond. Magnesium Oxide and water are abundant in the interior of planets. Here, the authors predict three new MgO-H2O compounds: Mg2O3H2, MgO3H4 and MgO4H6, and they exhibit superionic behavior in planetary interior conditions.
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