Pressure Dependence of the Liquidus and Solidus Temperatures in the Fe-P Binary System Determined by In Situ Ultrasonics: Implications to the Solidification of Fe-P Liquids in Planetary Cores

Chantel, Julien; Jing, Zhicheng; Xu, Man; Yu, Tony; Wang, Yanbin

doi:10.1029/2017JE005376

Title: Pressure Dependence of the Liquidus and Solidus Temperatures in the Fe-P Binary System Determined by In Situ Ultrasonics: Implications to the Solidification of Fe-P Liquids in Planetary Cores

Journal Article · Wed Apr 25 00:00:00 EDT 2018 · Journal of Geophysical Research. Planets

DOI:https://doi.org/10.1029/2017JE005376· OSTI ID:1452858

^[1];

^[2]; Xu, Man ^[2]; Yu, Tony ^[3];

^[3]

Case Western Reserve Univ., Cleveland, OH (United States); Univ. of Lille (France)
Case Western Reserve Univ., Cleveland, OH (United States)
Univ. of Chicago, IL (United States)

We have developed a new technique for determining the liquidus and eutectic (or solidus) temperatures of Fe–light element alloys at high pressures in a multianvil apparatus, by studying ultrasonic wave propagation through the sample. While the onset of melting is manifested by the loss of both compressional (P–) and shear (S–) wave signals due to the scattering of sound waves by partial melts, the completion of melting is confirmed by the reappearance of the P wave signal when the scattering due to residual crystals disappears. By applying this technique to the Fe–P binary system with three different phosphorus contents, we were able to constrain the Fe–rich portion of the phase diagram up to 7 GPa and 1,733 K. Our results show that for phosphorus–poor compositions, ranging from Fe–5wt%P to the eutectic composition, the liquidus temperature exhibits a weak negative pressure dependence (dT/dP = –10.4 K GPa^–1 for Fe–5wt%P). While for the phosphorus–richer compositions, including Fe–10wt%P and Fe3P, the liquidus temperature increases significantly with pressure (dT/dP = 71.3 and 62.5 K GPa^–1, respectively). Here, this indicates a shift of the eutectic composition to lower phosphorus contents with increasing pressure. Consequently, molten metallic cores of planetary bodies with phosphorus contents ranging from Fe–5wt%P to the eutectic composition would start crystallization from the top of the core and proceed downward. Whereas cores with phosphorus–richer compositions (Fe–10wt%P to Fe₃P) would undergo a bottom–up crystallization, resulting in a growing solid inner core.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE; National Aeronautics and Space Administration (NASA); National Science Foundation (NSF); National Aeronautics and Space Administration

Grant/Contract Number:: FG02‐94ER14466; AC02‐06CH11357; EAR‐1128799; NNX14AN01G; NNX15AH31G

OSTI ID:: 1452858

Journal Information:: Journal of Geophysical Research. Planets, Vol. 123, Issue 5; ISSN 2169-9097

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: ENGLISH

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Cited by: 10 works

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References (30)

Phase relations in the system Fe-FeSi at 21 GPa Kuwayama, Yasuhiro; Hirose, Kei American Mineralogist, Vol. 89, Issue 2-3 https://doi.org/10.2138/am-2004-2-303	journal	February 2004
Allabogdanite, (Fe,Ni) ₂ P, a new mineral from the Onello meteorite: The occurrence and crystal structure Britvin, Sergey N.; Rudashevsky, Nikolay S.; Krivovichev, Sergey V. American Mineralogist, Vol. 87, Issue 8-9 https://doi.org/10.2138/am-2002-8-924	journal	August 2002
Simultaneous structure and elastic wave velocity measurement of SiO ₂ glass at high pressures and high temperatures in a Paris-Edinburgh cell Kono, Yoshio; Park, Changyong; Sakamaki, Tatsuya Review of Scientific Instruments, Vol. 83, Issue 3 https://doi.org/10.1063/1.3698000	journal	March 2012
Melting and crystal structure of iron at high pressures and temperatures Shen, Guoyin; Mao, Ho-kwang; Hemley, Russell J. Geophysical Research Letters, Vol. 25, Issue 3 https://doi.org/10.1029/97GL03776	journal	February 1998
Unified analyses for P - V - T equation of state of MgO: A solution for pressure-scale problems in high P - T experiments Tange, Yoshinori; Nishihara, Yu; Tsuchiya, Taku Journal of Geophysical Research, Vol. 114, Issue B3 https://doi.org/10.1029/2008JB005813	journal	January 2009
Sulfur's impact on core evolution and magnetic field generation on Ganymede Hauck, Steven A.; Aurnou, Jonathan M.; Dombard, Andrew J. Journal of Geophysical Research, Vol. 111, Issue E9 https://doi.org/10.1029/2005JE002557	journal	January 2006
Sulfur in the Earth’s inner core Li, J.; Fei, Y.; Mao, H. K. Earth and Planetary Science Letters, Vol. 193, Issue 3-4 https://doi.org/10.1016/S0012-821X(01)00521-0	journal	December 2001
The Fe–C system at 5GPa and implications for Earth’s core Chabot, Nancy L.; Campbell, Andrew J.; McDonough, William F. Geochimica et Cosmochimica Acta, Vol. 72, Issue 16 https://doi.org/10.1016/j.gca.2008.06.006	journal	August 2008
The phase diagram of iron to 430 kbar Boehler, Reinhard Geophysical Research Letters, Vol. 13, Issue 11 https://doi.org/10.1029/GL013i011p01153	journal	November 1986
Finite Elastic Strain of Cubic Crystals Birch, Francis Physical Review, Vol. 71, Issue 11 https://doi.org/10.1103/PhysRev.71.809	journal	June 1947
Icosahedral coordination of phosphorus in the crystal structure of melliniite, a new phosphide mineral from the Northwest Africa 1054 acapulcoite Pratesi, G. American Mineralogist, Vol. 91, Issue 2-3 https://doi.org/10.2138/am.2006.2095	journal	February 2006
The Fe-rich liquidus in the Fe–FeS system from 1bar to 10GPa Buono, Antonio S.; Walker, David Geochimica et Cosmochimica Acta, Vol. 75, Issue 8 https://doi.org/10.1016/j.gca.2011.01.030	journal	April 2011
Temperature of Earth's core constrained from melting of Fe and Fe0.9Ni0.1 at high pressures Zhang, Dongzhou; Jackson, Jennifer M.; Zhao, Jiyong Earth and Planetary Science Letters, Vol. 447 https://doi.org/10.1016/j.epsl.2016.04.026	journal	August 2016
Experimental study and thermodynamic calculations of phase relations in the Fe–C system at high pressure Fei, Yingwei; Brosh, Eli Earth and Planetary Science Letters, Vol. 408 https://doi.org/10.1016/j.epsl.2014.09.044	journal	December 2014
Mars: A New Core-Crystallization Regime Stewart, A. J.; Schmidt, M. W.; van Westrenen, W. Science, Vol. 316, Issue 5829 https://doi.org/10.1126/science.1140549	journal	June 2007
Structure of eutectic Fe–FeS melts to pressures up to 17 GPa: Implications for planetary cores Morard, G.; Sanloup, C.; Fiquet, G. Earth and Planetary Science Letters, Vol. 263, Issue 1-2 https://doi.org/10.1016/j.epsl.2007.09.009	journal	November 2007
The large-volume high-pressure facility at GSECARS: A “Swiss-army-knife” approach to synchrotron-based experimental studies Wang, Yanbin; Rivers, Mark; Sutton, Steve Physics of the Earth and Planetary Interiors, Vol. 174, Issue 1-4 https://doi.org/10.1016/j.pepi.2008.06.017	journal	May 2009
Mapping the thermal structure of solid-media pressure assemblies Watson, E.; Wark, D.; Price, J. Contributions to Mineralogy and Petrology, Vol. 142, Issue 6 https://doi.org/10.1007/s00410-001-0327-4	journal	January 2002
Non-ideal liquidus curve in the Fe-S system and Mercury's snowing core: MERCURY'S SNOWING CORE Chen, Bin; Li, Jie; Hauck, Steven A. Geophysical Research Letters, Vol. 35, Issue 7 https://doi.org/10.1029/2008GL033311	journal	April 2008
Crystal structure of meteoritic schreibersites: determination of absolute structure Skála, Roman; Císařová, Ivana Physics and Chemistry of Minerals, Vol. 31, Issue 10 https://doi.org/10.1007/s00269-004-0435-6	journal	February 2005
Sulfur and phosphorus in the Earth's core: The Fe-P-S system at 23 GPa: SULFUR AND PHOSPHORUS IN THE EARTH'S CORE Stewart, A. J.; Schmidt, M. W. Geophysical Research Letters, Vol. 34, Issue 13 https://doi.org/10.1029/2007GL030138	journal	July 2007
Bottom-up versus top-down solidification of the cores of small solar system bodies: Constraints on paradoxical cores Williams, Quentin Earth and Planetary Science Letters, Vol. 284, Issue 3-4 https://doi.org/10.1016/j.epsl.2009.05.019	journal	July 2009
Experimental investigation of the partitioning of phosphorus between metal and silicate phases: implications for the Earth, Moon and Eucrite Parent Body Newsom, Horton E.; Drake, Michael J. Geochimica et Cosmochimica Acta, Vol. 47, Issue 1 https://doi.org/10.1016/0016-7037(83)90093-5	journal	January 1983
High-Pressure Iron-Sulfur Compound, Fe3S2, and Melting Relations in the Fe-FeS System Fei, Y.; Bertka, C. M.; Finger, L. W. Science, Vol. 275, Issue 5306 https://doi.org/10.1126/science.275.5306.1621	journal	March 1997
Thermodynamic properties and phase equilibria in the Fe–P system Zaitsev, A. I.; Dobrokhotova, Zh. V.; Litvina, A. D. J. Chem. Soc., Faraday Trans., Vol. 91, Issue 4 https://doi.org/10.1039/FT9959100703	journal	January 1995
Melting diagrams of Fe-rich alloys determined from synchrotron in situ measurements in the 15–23GPa pressure range Andrault, D.; Bolfan-Casanova, N.; Ohtaka, O. Physics of the Earth and Planetary Interiors, Vol. 174, Issue 1-4 https://doi.org/10.1016/j.pepi.2008.09.020	journal	May 2009
Sound velocity of Fe–S liquids at high pressure: Implications for the Moon's molten outer core Jing, Zhicheng; Wang, Yanbin; Kono, Yoshio Earth and Planetary Science Letters, Vol. 396 https://doi.org/10.1016/j.epsl.2014.04.015	journal	June 2014
Assessment of temperature gradients in multianvil assemblies using spinel layer growth kinetics: TEMPERATURE GRADIENTS van Westrenen, Wim; Van Orman, James A.; Watson, Heather Geochemistry, Geophysics, Geosystems, Vol. 4, Issue 4 https://doi.org/10.1029/2002GC000474	journal	April 2003
The α−γ−ε triple point of iron investigated by high pressure–high temperature neutron scattering Klotz, S.; Le Godec, Y.; Strässle, Th. Applied Physics Letters, Vol. 93, Issue 9 https://doi.org/10.1063/1.2976128	journal	September 2008
Cell assemblies for reproducible multi-anvil experiments (the COMPRES assemblies) Leinenweber, K. D.; Tyburczy, J. A.; Sharp, T. G. American Mineralogist, Vol. 97, Issue 2-3 https://doi.org/10.2138/am.2012.3844	journal	January 2012

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Electrical Resistivity of Iron Phosphides at High‐Pressure and High‐Temperature Conditions With Implications for Lunar Core's Thermal Conductivity Yin, Yuan; Zhai, Kuan; Zhang, Baohua Journal of Geophysical Research: Solid Earth, Vol. 124, Issue 6 https://doi.org/10.1029/2018jb017157	journal	June 2019
High-Pressure Sound Velocity Measurements of Liquids Using In Situ Ultrasonic Techniques in a Multianvil Apparatus Jing, Zhicheng; Yu, Tony; Xu, Man Minerals, Vol. 10, Issue 2 https://doi.org/10.3390/min10020126	journal	January 2020

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Title: Pressure Dependence of the Liquidus and Solidus Temperatures in the Fe-P Binary System Determined by In Situ Ultrasonics: Implications to the Solidification of Fe-P Liquids in Planetary Cores

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