Helium-Iron Compounds at Terapascal Pressures.
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Publication Date
2018-07-06Journal Title
Phys Rev Lett
ISSN
0031-9007
Publisher
American Physical Society (APS)
Volume
121
Issue
1
Pages
015301
Language
eng
Type
Article
Physical Medium
Print
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Monserrat Sanchez, B., Martinez-Canales, M., Needs, R., & Pickard, C. (2018). Helium-Iron Compounds at Terapascal Pressures.. Phys Rev Lett, 121 (1), 015301. https://doi.org/10.1103/PhysRevLett.121.015301
Abstract
We investigate the binary phase diagram of helium and iron using first-principles calculations. We find that helium, which is a noble gas and inert at ambient conditions, forms stable crystalline compounds with iron at terapascal pressures. A FeHe compound becomes stable above 4 TPa, and a FeHe_{2} compound above 12 TPa. Melting is investigated using molecular dynamics simulations, and a superionic phase with sublattice melting of the helium atoms is predicted. We discuss the implications of our predicted helium-iron phase diagram for interiors of giant (exo)planets and white dwarf stars.
Sponsorship
Engineering and Physical Sciences Research Council (EP/P034616/1)
Engineering and Physical Sciences Research Council (EP/F032773/1)
Engineering and Physical Sciences Research Council (EP/P022596/1)
Identifiers
External DOI: https://doi.org/10.1103/PhysRevLett.121.015301
This record's URL: https://www.repository.cam.ac.uk/handle/1810/283368
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