DOI: 10.1002/2015GL064400
论文题名: Effects of the Fe3+ spin transition on the equation of state of bridgmanite
作者: Mao Z. ; Lin J.-F. ; Yang J. ; Inoue T. ; Prakapenka V.B.
刊名: Geophysical Research Letters
ISSN: 0094-9592
EISSN: 1944-9323
出版年: 2015
卷: 42, 期: 11 起始页码: 4335
结束页码: 4342
语种: 英语
英文关键词: bridgmanite
; bulk sound velocity
; density
; equation of state
; lower mantle
; spin transition
Scopus关键词: Acoustic wave velocity
; Aluminum
; Density (specific gravity)
; Elastic moduli
; X ray diffraction
; Bridgmanite
; Equation of state
; Isothermal bulk modulus
; Lower mantle
; Spin transition
; Ssbauer spectroscopies
; Synchrotron x ray diffraction
; Theoretical calculations
; Equations of state
英文摘要: We have investigated the equation of state of Fe-bearing bridgmanite, (Mg0.9 Fe0.1 )SiO3 , using synchrotron X-ray diffraction in diamond anvil cells up to 125 GPa and 300 K. Combined with previous synchrotron Mössbauer spectroscopy results, we have found that the occurrence of the low-spin Fe3+ in the octahedral sites (B site) of bridgmanite has produced a 0.5(±0.1)% reduction in the unit cell volume at 18-25 GPa and has increased the isothermal bulk modulus to 284(±4) GPa, consistent with recent theoretical calculations. Together with literature results, we note that the addition of Fe can cause an increase in the density, bulk modulus, and bulk sound velocity in both Al-free and Al-bearing bridgmanite at lower mantle pressures. The presence of Fe3+ in the B site of bridgmanite can further enhance this increase. The observed spin transition of B site Fe3+ in bridgmanite is thus important for understanding the density and velocity structures of the lower mantle. ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84934436918&doi=10.1002%2f2015GL064400&partnerID=40&md5=8a750349efb4e443dd0f9a3aa1f90c70
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9207
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 Geological Sciences, Jackson School of Geosciences, University of Texas at Austin, Austin, TX, United States
Recommended Citation:
Mao Z.,Lin J.-F.,Yang J.,et al. Effects of the Fe3+ spin transition on the equation of state of bridgmanite[J]. Geophysical Research Letters,2015-01-01,42(11).