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X-ray diffraction and Mössbauer spectroscopy study of fcc iron hydride FeH at high pressures and implications for the composition of the Earth's core

Title data

Narygina, Olga ; Dubrovinsky, Leonid ; McCammon, Catherine ; Kurnosov, Alexander ; Kantor, Innokenty ; Prakapenka, Vitali B. ; Dubrovinskaia, Natalia:
X-ray diffraction and Mössbauer spectroscopy study of fcc iron hydride FeH at high pressures and implications for the composition of the Earth's core.
In: Earth and Planetary Science Letters. Vol. 307 (2011) Issue 3–4 . - 409 - 414.
ISSN 0012-821X
DOI: https://doi.org/10.1016/j.epsl.2011.05.015

Official URL: Volltext

Project information

Project financing: Deutsche Forschungsgemeinschaft
Eurocores EuroMinSci Programme

Abstract in another language

The phase fcc FeHx (x ~ 1) was synthesized at pressures over 30 {GPa} and temperatures over 1600(50) K. At room temperature this iron hydride is stable at pressures from 19(1) {GPa} up to at least 68(2) {GPa} (the highest pressure achieved in this study). A fit of the {PV} data collected for fcc FeHx at room temperature gives the following parameters for the equation of state: {V0} = 53.8(3) Å3, {K0} = 99(5) GPa, K′ = 11.7(5). Using this data the amount of H required to match the density of the Earth's core was estimated to be 0.5–1 wt. hydrogen in the outer core and 0.08–0.16 wt. hydrogen in the inner core. Our results also suggest that hydrogen and carbon do not occur together in the Earth's core.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Mössbauer spectroscopy
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences > Chair Crystallography
Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences > Professur Materialphysik und Technologie bei extremen Bedingungen > Professur Materialphysik und Technologie bei extremen Bedingungen - Univ.-Prof. Dr. Natalia Doubrovinckaia
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences
Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences > Professur Materialphysik und Technologie bei extremen Bedingungen
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 30 Jul 2015 08:14
Last Modified: 30 Jul 2015 08:14
URI: https://eref.uni-bayreuth.de/id/eprint/17426