globalchange  > 气候减缓与适应
DOI: 10.1029/2017JE005376
Scopus记录号: 2-s2.0-85048358945
论文题名:
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
作者: Chantel J.; Jing Z.; Xu M.; Yu T.; Wang Y.
刊名: Journal of Geophysical Research: Planets
ISSN: 21699097
出版年: 2018
卷: 123, 期:5
起始页码: 1113
结束页码: 1124
语种: 英语
英文关键词: Fe-P phase diagrams ; high pressure ; solidification of planetary cores ; ultrasonic measurements ; X-ray diffraction
Scopus关键词: core (planetary) ; high pressure ; solidification ; ultrasonics ; X-ray diffraction
英文摘要: 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). 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. ©2018. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113970
Appears in Collections:气候减缓与适应

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作者单位: Department of Earth, Environmental, and Planetary Sciences, Case Western Reserve University, Cleveland, OH, United States; Now at UMET, Unité Matériaux Et Transformations, Bâtiment C6, University of Lille, Lille, France; Center for Advanced Radiation Sources, The University of Chicago, Chicago, IL, United States

Recommended Citation:
Chantel J.,Jing Z.,Xu M.,et al. 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[J]. Journal of Geophysical Research: Planets,2018-01-01,123(5)
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