DOI: 10.1002/2016GL069836
论文题名: High-spin Fe2+ and Fe3+ in single-crystal aluminous bridgmanite in the lower mantle
作者: Lin J.-F. ; Mao Z. ; Yang J. ; Liu J. ; Xiao Y. ; Chow P. ; Okuchi T.
刊名: Geophysical Research Letters
ISSN: 0094-8918
EISSN: 1944-8649
出版年: 2016
卷: 43, 期: 13 起始页码: 6952
结束页码: 6959
语种: 英语
英文关键词: bridgmanite
; high pressure
; lower mantle
; mineral physics
; spin and valence states
; spin transition
Scopus关键词: Silicon wafers
; Single crystals
; Bridgmanite
; High pressure
; Lower mantle
; Mineral physics
; Spin transition
; Valence state
; Aluminum
; annealing
; high pressure
; iron
; lower mantle
; Mossbauer spectroscopy
; phase transition
; physics
; silicate mineral
; substitution
英文摘要: Spin and valence states of iron in single-crystal bridgmanite (Mg0.89Fe0.12Al0.11Si0.89O3) are investigated using X-ray emission and Mössbauer spectroscopies with laser annealing up to 115 GPa. The results show that Fe predominantly substitutes for Mg2+ in the pseudo-dodecahedral A site, in which 80% of the iron is Fe3+ that enters the lattice via the charge-coupled substitution with Al3+ in the octahedral B site. The total spin momentum and hyperfine parameters indicate that these ions remain in the high-spin state with Fe2+ having extremely high quadrupole splitting due to lattice distortion. (Al,Fe)-bearing bridgmanite is expected to contain mostly high-spin, A-site Fe3+, together with a smaller amount of A-site Fe2+, that remains stable throughout the region. Even though the spin transition of B-site Fe3+ in bridgmanite was reported to cause changes in its elasticity at high pressures, (Fe,Al)-bearing bridgmanite with predominantly A-site Fe will not exhibit elastic anomalies associated with the spin transition. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84978517868&doi=10.1002%2f2016GL069836&partnerID=40&md5=0756e1e000e1ffa25dc3375e1be1195d
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9881
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:
Lin J.-F.,Mao Z.,Yang J.,et al. High-spin Fe2+ and Fe3+ in single-crystal aluminous bridgmanite in the lower mantle[J]. Geophysical Research Letters,2016-01-01,43(13).