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Title: The spin state of iron in minerals of Earth's lower mantle

Journal Article · · Geophysical Research Letters
 [1];  [2];  [3]
  1. Argonne National Lab. (ANL), Lemont, IL (United States)
  2. Univ. of Illinois at Urbana-Champaign, Urbana, IL (United States)
  3. Carnegie Institution of Washington, Washington, DC (United States)

Here, the spin state of Fe(II) and Fe(III) at temperatures and pressures typical for the Earth's lower mantle is discussed. We predict an extended high-spin to low-spin crossover region along the geotherm for Fe-dilute systems depending on crystal-field splitting, pairing energy, and cooperative interactions. In particular, spin transitions in ferromagnesium silicate perovskite and ferropericlase, the dominant lower mantle components, should occur in a wide temperature-pressure range. We also derive a gradual volume change associated with such transitions in the lower mantle. The gradual density changes and the wide spin crossover regions seem incompatible with lower mantle stratification resulting from a spin transition.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
898678
Journal Information:
Geophysical Research Letters, Vol. 32, Issue 12; ISSN 0094-8276
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 104 works
Citation information provided by
Web of Science

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Cited By (17)

Low‐Spin‐State Hematite with Superior Adsorption of Anionic Contaminations for Water Purification journal February 2020
Deformation of lower-mantle ferropericlase (Mg,Fe)O across the electronic spin transition journal April 2009
Single crystal growth, crystalline structure investigation and high-pressure behavior of impurity-free siderite (FeCO3) journal March 2018
Laboratory Electrical Conductivity Measurement of Mantle Minerals journal November 2009
Effects of Iron Spin Transition on the Structure and Stability of Large Primordial Reservoirs in Earth's Lower Mantle: Effects of iron spin transition journal June 2018
Lower Mantle Dynamics Perceived With 50 Years of Hindsight From Plate Tectonics journal December 2019
Spin transition of ferropericlase under shock compression journal July 2018
Quantum critical point and spin fluctuations in lower-mantle ferropericlase journal April 2013
Mechanism of magnetic moment collapse under pressure in ferropericlase journal June 2015
Investigation of iron spin crossover pressure in Fe-bearing MgO using hybrid functional journal March 2018
Electronic reconstruction of hexagonal FeS: a view from density functional dynamical mean-field theory journal March 2017
Magnetism in spin crossover systems: Short-range order and effects beyond the Heisenberg model journal October 2019
Cooperative phenomena in spin crossover systems journal October 2017
Evaluating the Role of Iron-Rich (Mg,Fe)O in Ultralow Velocity Zones journal December 2019
Compression of a multiphase mantle assemblage: Effects of undesirable stress and stress annealing on the iron spin state crossover in ferropericlase text January 2016
Cooperative Phenomena in Spin Crossover Systems text January 2016
Magnetism in spin crossover systems: short-range order and effects beyond the Heisenberg model text January 2019

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