DOI: 10.1002/2015GL064496
论文题名: Stability and compressibility of a new iron-nitride β-Fe<inf>7</inf>N<inf>3</inf> to core pressures
作者: Minobe S. ; Nakajima Y. ; Hirose K. ; Ohishi Y.
刊名: Geophysical Research Letters
ISSN: 0094-9523
EISSN: 1944-9254
出版年: 2015
卷: 42, 期: 13 起始页码: 5206
结束页码: 5211
语种: 英语
英文关键词: core
; high pressure
; iron nitride
; nitrogen
; phase transition
Scopus关键词: Acoustic wave velocity
; Diamond deposits
; Experimental mineralogy
; High pressure engineering
; Iron
; Nitrides
; Nitrogen
; Phase transitions
; Shear flow
; Shear waves
; Wave propagation
; X ray diffraction
; Core
; Earth's inner cores
; High pressure
; Intermediate compound
; Iron nitrides
; Laser-heated diamond anvil cells
; Shear wave velocity
; Synchrotron x ray diffraction
; Iron compounds
; alloy
; compressibility
; Earth
; elastic property
; high pressure
; inner core
; iron
; phase transition
; S-wave
; volume
; X-ray diffraction
英文摘要: We have examined the phase relations in the iron-rich portion of the Fe-N binary system up to 150GPa and 2720K in a laser-heated diamond anvil cell. Synchrotron X-ray diffraction measurements revealed the formation of a new phase (β-Fe7 N3 ) above 41GPa and ∼1000K. The β phase is structurally identical or very close to Fe7 C3 and the most iron-rich Fe-N intermediate compound at its stability field. We also measured the volume of β-Fe7 N3 to 132GPa and found its elastic property very similar to that of Fe7 C3 . Recently, it has been proposed that the density and sound velocities, in particular, shear wave velocity, in the Earth's inner core are reconciled with Fe7 C3 , but such properties could be explained by β-Fe7 N3 equally well. It is therefore possible that the inner core consists of Fe7 (C,N)3 , which is found as diamond inclusions and likely stable under inner core conditions. Key Points High P-T exp. show a novel phase transition in the most Fe-rich iron nitride A new Fe7 N3 phase is very similar in structure and elastic property to Fe7 C3 The Earth's inner core may consist of the new Fe7 N3 or Fe7 (C,N)3 phase. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84938198764&doi=10.1002%2f2015GL064496&partnerID=40&md5=e1de3a80c1cca61e8c9e8e73e19b79a1
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9138
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: Department of Earth and Planetary Sciences, Tokyo Institute of Technology, Tokyo, Japan
Recommended Citation:
Minobe S.,Nakajima Y.,Hirose K.,et al. Stability and compressibility of a new iron-nitride β-Fe<inf>7</inf>N<inf>3</inf> to core pressures[J]. Geophysical Research Letters,2015-01-01,42(13).