Thermal expansion of liquid Fe-S alloy at ...
Document type :
Article dans une revue scientifique: Article original
Permalink :
Title :
Thermal expansion of liquid Fe-S alloy at high pressure
Author(s) :
Xu, F. [Auteur]
Morard, G. [Auteur]
Guignot, N. [Auteur]
Rivoldini, A. [Auteur]
Manthilake, G. [Auteur]
Chantel, Julien [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Unité Matériaux et Transformations (UMET) - UMR 8207
Xie, L. [Auteur]
Yoneda, A. [Auteur]
King, A. [Auteur]
Boulard, E. [Auteur]
Pandolfi, S. [Auteur]
Ryerson, F.J. [Auteur]
Antonangeli, D. [Auteur]
Morard, G. [Auteur]
Guignot, N. [Auteur]
Rivoldini, A. [Auteur]
Manthilake, G. [Auteur]
Chantel, Julien [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Unité Matériaux et Transformations (UMET) - UMR 8207
Xie, L. [Auteur]
Yoneda, A. [Auteur]
King, A. [Auteur]
Boulard, E. [Auteur]
Pandolfi, S. [Auteur]
Ryerson, F.J. [Auteur]
Antonangeli, D. [Auteur]
Journal title :
Earth and Planetary Science Letters
Volume number :
563
Pages :
116884
Publisher :
Elsevier BV
Publication date :
2021-06-01
ISSN :
0012-821X
English keyword(s) :
liquid iron-sulfur alloys
density
thermal expansion
high pressure and temperature
telluric planetary cores
crystallization regime
density
thermal expansion
high pressure and temperature
telluric planetary cores
crystallization regime
HAL domain(s) :
Chimie/Matériaux
Physique [physics]/Matière Condensée [cond-mat]/Science des matériaux [cond-mat.mtrl-sci]
Physique [physics]/Physique [physics]/Géophysique [physics.geo-ph]
Physique [physics]/Astrophysique [astro-ph]
Planète et Univers [physics]/Astrophysique [astro-ph]
Planète et Univers [physics]/Sciences de la Terre
Physique [physics]/Matière Condensée [cond-mat]/Science des matériaux [cond-mat.mtrl-sci]
Physique [physics]/Physique [physics]/Géophysique [physics.geo-ph]
Physique [physics]/Astrophysique [astro-ph]
Planète et Univers [physics]/Astrophysique [astro-ph]
Planète et Univers [physics]/Sciences de la Terre
English abstract : [en]
Local structure and density of liquid Fe-S alloys at high pressure have been determined in situ by combined angle and energy dispersive X-ray diffraction experiments in a multi-anvil apparatus, covering a large temperature ...
Show more >Local structure and density of liquid Fe-S alloys at high pressure have been determined in situ by combined angle and energy dispersive X-ray diffraction experiments in a multi-anvil apparatus, covering a large temperature and compositional range. Precise density measurements collected for increasing temperature allowed us to directly derive the thermal expansion coefficients for liquid Fe-S alloys as a function of composition. In turn, thermal expansion has been used to refine thermodynamic models and to address the crystallization regime of telluric planetary cores by comparing the adiabatic temperature gradient and the slope of the liquidus in the Fe-FeS system. For Fe-S cores of asteroids and small planetesimals, top-down solidification is the dominant scenario as the compositional domain for which the slope of the liquidus is greater than the adiabatic gradient is limited to a narrow portion on the Fe-rich side. However, bottom-up growth of the inner core is expected for S-poor cases, with this compositional domain expanding to more S-rich compositions with increasing pressure (size of the planetary body). In particular, bottom-up crystallization cannot be excluded for the Moon and Ganymede.Show less >
Show more >Local structure and density of liquid Fe-S alloys at high pressure have been determined in situ by combined angle and energy dispersive X-ray diffraction experiments in a multi-anvil apparatus, covering a large temperature and compositional range. Precise density measurements collected for increasing temperature allowed us to directly derive the thermal expansion coefficients for liquid Fe-S alloys as a function of composition. In turn, thermal expansion has been used to refine thermodynamic models and to address the crystallization regime of telluric planetary cores by comparing the adiabatic temperature gradient and the slope of the liquidus in the Fe-FeS system. For Fe-S cores of asteroids and small planetesimals, top-down solidification is the dominant scenario as the compositional domain for which the slope of the liquidus is greater than the adiabatic gradient is limited to a narrow portion on the Fe-rich side. However, bottom-up growth of the inner core is expected for S-poor cases, with this compositional domain expanding to more S-rich compositions with increasing pressure (size of the planetary body). In particular, bottom-up crystallization cannot be excluded for the Moon and Ganymede.Show less >
Language :
Anglais
Peer reviewed article :
Oui
Audience :
Internationale
Popular science :
Non
ANR Project :
Administrative institution(s) :
Université de Lille
CNRS
INRA
ENSCL
CNRS
INRA
ENSCL
Collections :
Research team(s) :
Matériaux Terrestres et Planétaires
Submission date :
2021-05-07T10:13:47Z
2021-05-17T15:06:59Z
2021-05-17T15:06:59Z