title: Body-centered cubic iron-nickel alloy in Earth's core.
abstract: Cosmochemical, geochemical, and geophysical studies provide evidence that Earth's core contains iron with substantial (5 to 15%) amounts of nickel. The iron-nickel alloy Fe(0.9)Ni(0.1) has been studied in situ by means of angle-dispersive x-ray diffraction in internally heated diamond anvil cells (DACs), and its resistance has been measured as a function of pressure and temperature. At pressures above 225 gigapascals and temperatures over 3400 kelvin, Fe(0.9)Ni(0.1) adopts a body-centered cubic structure. Our experimental and theoretical results not only support the interpretation of shockwave data on pure iron as showing a solid-solid phase transition above about 200 gigapascals, but also suggest that iron alloys with geochemically reasonable compositions (that is, with substantial nickel, sulfur, or silicon content) adopt the bcc structure in Earth's inner core.
authors.affiliation: Bayerisches Geoinstitut, Universität Bayreuth, D-95440 Bayreuth, Germany.
authors.forename: L
authors.initials: L
authors.lastname: Dubrovinsky
authors.forename: N
authors.initials: N
authors.lastname: Dubrovinskaia
authors.forename: O
authors.initials: O
authors.lastname: Narygina
authors.forename: I
authors.initials: I
authors.lastname: Kantor
authors.forename: A
authors.initials: A
authors.lastname: Kuznetzov
authors.forename: V B
authors.initials: VB
authors.lastname: Prakapenka
authors.forename: L
authors.initials: L
authors.lastname: Vitos
authors.forename: B
authors.initials: B
authors.lastname: Johansson
authors.forename: A S
authors.initials: AS
authors.lastname: Mikhaylushkin
authors.forename: S I
authors.initials: SI
authors.lastname: Simak
authors.forename: I A
authors.initials: IA
authors.lastname: Abrikosov