Helium-Iron Compounds at Terapascal Pressures.
Authors
Monserrat, Bartomeu
Martinez-Canales, Miguel
Needs, Richard J
Pickard, Chris J
Change log
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.
Publication Date
2018-07-06
Online Publication Date
2018-07-03
Acceptance Date
2018-06-01
Keywords
cond-mat.mtrl-sci, cond-mat.mtrl-sci, astro-ph.EP
Journal Title
Phys Rev Lett
Journal ISSN
0031-9007
1079-7114
1079-7114
Volume Title
121
Publisher
American Physical Society (APS)
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)
Engineering and Physical Sciences Research Council (EP/F032773/1)
Engineering and Physical Sciences Research Council (EP/P022596/1)