Abstract
The high-pressure structural and electronic behavior of α-, β-, and g-FeOOH were studied in situ using a combination of synchrotron X ray diffraction (XRD) and X ray emission spectroscopy (XES). We monitored α-FeOOH by XES as a function of pressure up to 85 GPa and observed an electronic spin transition that began at approximately 50 GPa, which is consistent with previous results. In the γ-FeOOH sample, we see the initiation of a spin transition at 35 GPa that remains incomplete up to 65 GPa. β-FeOOH does not show any indication of a spin transition up to 65 GPa. Analysis of the high-pressure XRD data shows that neither β-FeOOH nor γ-FeOOH transform to new crystal structures, and both amorphize above 20 GPa. Comparing our EOS results for the b and g phases with recently published data on the a and e phases, we found that β-FeOOH exhibits distinct behavior from the other three polymorphs, as it is significantly less compressible and does not undergo a spin transition. A systematic examination of these iron hydroxide polymorphs as a function of pressure can provide insight into the relationship between electronic spin transitions and structural transitions in these OH- and Fe3+-bearing phases that may have implications on our understanding of the water content and oxidation state of the mantle.
Acknowledgments
M.M. Reagan, A.E. Gleason, and W.L. Mao are supported by the NSF Geophysics Program (EAR-1446969). We thank Paul Chow (APS), Alastair MacDowell (ALS), and Jinyuan Yan (ALS) for their assistance with the synchrotron experiments, and Jinfu Shu (Geophysical Lab) for help with sample loading. Portions of this work were performed at beamline 12.2.2 of ALS, LBNL. ALS is supported by the Director, Office of Science, Office of Basic Energy Sciences (BES), of the U.S. Department of Energy (DOE) under Contract No. DE-AC02-05CH11231. Portions of this work were also performed at HPCAT (Sector 16), APS, ANL. HPCAT operations are supported by DOE-NNSA under Award No. DE-NA0001974 and DOE-BES under Award No. DE-FG02-99ER45775, with partial instrumentation funding by NSF. APS is a DOE-BES User Facility operated for the DOE Office of Science by ANL under Contract No. DE-AC02-06CH11357.
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Artikel in diesem Heft
- Invited Centennial Article
- On the nature and significance of rarity in mineralogy
- Special collection: mechanisms, rates, and timescales of geochemical transport processes in the crust and mantle
- Zircon saturation and Zr diffusion in rhyolitic melts, and zircon growth geospeedometer
- Review
- On silica-rich granitoids and their eruptive equivalents
- Special collection: advances in ultrahigh-pressure metamorphism
- Discovery of in situ super-reducing, ultrahigh-pressure phases in the Luobusa ophiolitic chromitites, Tibet: new insights into the deep upper mantle and mantle transition zone
- Special collection: from magmas to ore deposits
- Uraninite from the Olympic Dam IOCG-U-Ag deposit: linking textural and compositional variation to temporal evolution
- Special collection: from magmas to ore deposits
- A story of olivine from the McIvor Hill complex (Tasmania, Australia): Clues to the origin of the Avebury metasomatic Ni sulfide deposit
- Special collection: perspectives on origins and evolution of crustal magmas
- The origin of extensive Neoarchean high-silica batholiths and the nature of intrusive complements to silicic ignimbrites: Insights from the Wyoming batholith, U.S.A.
- Special collection: perspectives on origins and evolution of crustal magmas
- From the Hadean to the Himalaya: 4.4 Ga of felsic terrestrial magmatism
- Spinels renaissance: the past, present, and future of those ubiquitous minerals and materials
- Compositional effects on the solubility of minor and trace elements in oxide spinel minerals: insights from crystal-crystal partition coefficients in chromite exsolution
- Spinels renaissance: the past, present, and future of those ubiquitous minerals and materials
- An X-ray magnetic circular dichroism (XMCD) study of Fe ordering in a synthetic MgAl2O4-Fe3O4 (spinel-magnetite) solid-solution series: Implications for magnetic properties and cation site ordering
- Research Article
- High concentrations of manganese and sulfur in deposits on Murray Ridge, Endeavour Crater, Mars
- Research Article
- A Cr3+ luminescence study of spodumene at high pressures: effects of site geometry, a phase transition, and a level-crossing
- Research Article
- Phase transitions between high- and low-temperature orthopyroxene in the Mg2Si2O6-Fe2Si2O6 system
- Research Article
- High-temperature and high-pressure behavior of carbonates in the ternary diagram CaCO3-MgCO3-FeCO3
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- Constraints on the solid solubility of Hg, Tl, and Cd in arsenian pyrite
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- Ni-phyllosilicates (garnierites) from the Falcondo Ni-laterite deposit (Dominican Republic): mineralogy, nanotextures, and formation mechanisms by HRTEM and AEM
- Research Article
- Cu diffusion in a basaltic melt
- Research Article
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- New Mineral Names
- New Mineral Names