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DOI: 10.1002/2016GL069456
论文题名:
Thermal equation of state of hcp-iron: Constraint on the density deficit of Earth’s solid inner core
作者: Fei Y.; Murphy C.; Shibazaki Y.; Shahar A.; Huang H.
刊名: Geophysical Research Letters
ISSN: 0094-8927
EISSN: 1944-8658
出版年: 2016
卷: 43, 期:13
起始页码: 6837
结束页码: 6843
语种: 英语
英文关键词: core density ; equation of state ; iron
Scopus关键词: Acoustic wave velocity ; Equations of state of solids ; Iron ; Iron compounds ; Birch-Murnaghan equation of state ; Core densities ; Equation of state ; Hexagonal close-packed iron (hcp-Fe) ; High-pressure experiment ; Pressure derivatives ; Pressure transmitting media ; Thermal equation of state ; Equations of state ; adiabatic process ; bulk modulus ; density ; equation of state ; experimental study ; inner core ; iron ; pressure field ; thermodynamics
英文摘要: We conducted high-pressure experiments on hexagonal close packed iron (hcp-Fe) in MgO, NaCl, and Ne pressure-transmitting media and found general agreement among the experimental data at 300 K that yield the best fitted values of the bulk modulus K0 = 172.7(±1.4) GPa and its pressure derivative K0′ = 4.79(±0.05) for hcp-Fe, using the third-order Birch-Murnaghan equation of state. Using the derived thermal pressures for hcp-Fe up to 100 GPa and 1800 K and previous shockwave Hugoniot data, we developed a thermal equation of state of hcp-Fe. The thermal equation of state of hcp-Fe is further used to calculate the densities of iron along adiabatic geotherms to define the density deficit of the inner core, which serves as the basis for developing quantitative composition models of the Earth’s inner core. We determine the density deficit at the inner core boundary to be 3.6%, assuming an inner core boundary temperature of 6000 K. ©2016. American Geophysical Union. All Rights Reserved.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84978116087&doi=10.1002%2f2016GL069456&partnerID=40&md5=0bd368213efce4e2f21fa3320e28ea45
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9890
Appears in Collections:科学计划与规划
气候变化与战略

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作者单位: Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC, United States

Recommended Citation:
Fei Y.,Murphy C.,Shibazaki Y.,et al. Thermal equation of state of hcp-iron: Constraint on the density deficit of Earth’s solid inner core[J]. Geophysical Research Letters,2016-01-01,43(13).
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