2026-10-07T10:03:15Z https://api.figshare.com/v2/oai

oai:figshare.com:article/34023954 2026-09-29T13:25:46Z category_30175 item_type_12 month_year_09_2026

Helium Trapping in Mg–Silicates at Multi-Megabar Pressures Kang Yang (25137222) Structural properties of condensed matter high pressure physics Helium-bearing Mg-Silicates Machine learning potential Structural Properties <p dir="ltr">Helium retention under extreme compression is widely discussed, yet the microscopic</p><p dir="ltr">host phases and stabilization mechanisms remain unsettled. Mg-Si-O minerals form</p><p dir="ltr">the dominant condensed framework of rocky interiors across broad pressuretemperature</p><p dir="ltr">conditions and throughout planetary evolution, making Mg–silicates the</p><p dir="ltr">most relevant (and stringent) minerals in which to assess helium incorporation.</p><p dir="ltr">Meanwhile rare study focuses on the high-pressure behavior between Helium and</p><p dir="ltr">Mg-Silicates.</p><p dir="ltr">Here, we explore the ternary MgO-SiO2-He system and identify two</p><p dir="ltr">thermodynamically stable helium-bearing Mg silicates, Mg2SiO4He and Mg2SiO4He2,</p><p dir="ltr">over 250–930 GPa. We reveal a clear microscopic mechanism: pressure-driven</p><p dir="ltr">reorganization of post-perovskite-derived Mg-Si-O frameworks create interstitial</p><p dir="ltr">cavities that confine helium without chemical bonding.</p> 2026-09-29T13:25:46Z Text Preprint 10.6084/m9.figshare.34023954.v1 https://figshare.com/articles/preprint/Helium_Trapping_in_Mg_Silicates_at_Multi-Megabar_Pressures/34023954 CC BY 4.0