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Title: Compression of a multiphase mantle assemblage: Effects of undesirable stress and stress annealing on the iron spin state crossover in ferropericlase: Stresses and HS-LS Crossover in (Mg,Fe)O

Journal Article · · Journal of Geophysical Research. Solid Earth
DOI:https://doi.org/10.1002/2015JB012321· OSTI ID:1379196
 [1];  [2];  [3];  [4]
  1. Yale Univ., New Haven, CT (United States). Dept. of Geology and Geophysics; Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany). German Electron Synchrotron DESY in the Helmholtz Association
  2. Univ. of Bayreuth (Germany). Geo Inst.
  3. Carnegie Inst. of Washington, Argonne, IL (United States). Geophysical Lab.
  4. Yale Univ., New Haven, CT (United States). Dept. of Geology and Geophysics

Using synchrotron-based X-ray diffraction, we explore characteristic signatures for nonhydrostaticstresses and their effect on the spin state crossover of ferrous iron in (Mg, Fe)O ferropericlase (Fp) uponcompression in a two-phase mixture which includes an Al- and Fe-bearing bridgmanite (Bm). Here, we observe aninfluence of nonhydrostatic stresses on the spin state crossover starting pressure and width. The undesirablestresses discussed here include uniaxial deviatoric stress evolving in the diamond anvil cell and effects ofintergrain interaction. And while the former leads to a pressure overestimation, the latter one lowers the pressure ofthe onset for the high-spin to low-spin electronic transition in Fe2+ in ferropericlase (Mg, Fe)O with respect tohydrostatic conditions.

Research Organization:
Carnegie Inst. of Science, Washington, DC (United States). Geophysical Lab.
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
Grant/Contract Number:
NA0002006; NA0001974; FG02-99ER45775; AC02-06CH11357; FG02-94ER14466; EAR-0955824
OSTI ID:
1379196
Journal Information:
Journal of Geophysical Research. Solid Earth, Vol. 121, Issue 5; ISSN 2169-9313
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 15 works
Citation information provided by
Web of Science

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Cited By (3)

A Novel High‐Pressure Tin Oxynitride Sn 2 N 2 O journal January 2020
Viscosity jump in the lower mantle inferred from melting curves of ferropericlase journal December 2017
A Novel High‐Pressure Tin Oxynitride $Sn_{2}N_{2}O$ text January 2019

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