Electronic and magnetic structures of the postperovskite-type Fe
            <sub>2</sub>
            O
            <sub>3</sub>
            and implications for planetary magnetic records and deep interiors

Shim, Sang‐Heon; Bengtson, Amelia; Morgan, Dane; Sturhahn, W.; Catalli, K.; Zhao, Jiyong; Lerche, M.; Prakapenka, Vitali B.

doi:10.1073/pnas.0808549106

Cited by 65 publications

(57 citation statements)

References 40 publications

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“…Monitoring the spin states of iron oxy-hydroxides as a function of pressure gives insight into the relationship between electronic spin transitions and structural transitions -which has previously been studied in other key iron-bearing mantle minerals, including silicate perovskites (e.g., Badro et al, 2004;Li et al, 2004;Shim et al, 2009) and ferropericlase (e.g., Lin et al, 2007;Marquardt et al, 2009). Here we have combined XES and XRD experimental data and theoretical calculations providing evidence for a spin transition in Fe 3+ of ε-FeOOH that is preceded by a second order phase transition, whose main characteristic is given by the presence of symmetric hydrogen bonds.…”

Section: Resultsmentioning

confidence: 99%

Symmetrization driven spin transition in ε-FeOOH at high pressure

Gleason

Quiroga²,

Suzuki

et al. 2013

Earth and Planetary Science Letters

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Section: Resultsmentioning

confidence: 99%

Symmetrization driven spin transition in ε-FeOOH at high pressure

Gleason

Quiroga²,

Suzuki

et al. 2013

Earth and Planetary Science Letters

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“…The NFS hyperfine signals are very sensitive to internal magnetic fields, electric field gradients, and isomer shifts [303][304][305], and has been used to study HP behavior of materials at megabar pressures, such as magnetic collapse [172,243,306], site occupancy [244,307], and valence and spin state [308][309][310][311]. Fast NFS experiments have been performed to determine the HP melting temperatures of iron [312], by measuring the LambMössbauer factor which describes the probability of recoilless absorption.…”

Section: Hp Nuclear Forward Scatteringmentioning

confidence: 99%

High-pressure studies with x-rays using diamond anvil cells

2016

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Pressure profoundly alters all states of matter. The symbiotic development of ultrahighpressure diamond anvil cells, to compress samples to sustainable multi-megabar pressures; and synchrotron x-ray techniques, to probe materials' properties in situ, has enabled the exploration of rich high-pressure (HP) science. In this article, we first introduce the essential concept of diamond anvil cell technology, together with recent developments and its integration with other extreme environments. We then provide an overview of the latest developments in HP synchrotron techniques, their applications, and current problems, followed by a discussion of HP scientific studies using x-rays in the key multidisciplinary fields. These HP studies include: HP x-ray emission spectroscopy, which provides information on the filled electronic states of HP samples; HP x-ray Raman spectroscopy, which probes the HP chemical bonding changes of light elements; HP electronic inelastic x-ray scattering spectroscopy, which accesses high energy electronic phenomena, including electronic band structure, Fermi surface, excitons, plasmons, and their dispersions; HP resonant inelastic x-ray scattering spectroscopy, which probes shallow core excitations, multiplet structures, and spin-resolved electronic structure; HP nuclear resonant x-ray spectroscopy, which provides phonon densities of state and time-resolved Mössbauer information; HP x-ray imaging, which provides information on hierarchical structures, dynamic processes, and internal strains; HP x-ray diffraction, which determines the fundamental structures and densities of single-crystal, polycrystalline, nanocrystalline, and non-crystalline materials; and HP radial x-ray diffraction, which yields deviatoric, elastic and rheological information. Integrating these tools with hydrostatic or uniaxial pressure media, laser and resistive heating, and cryogenic cooling, has enabled investigations of the structural, vibrational, electronic, and magnetic properties of materials over a wide range of pressure-temperature conditions.

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“…Two structural models have been proposed [24][25][26] -that of the high pressure Rh 2 O 3 -II-type structure (space group Pbna, #60) and the orthorhombic perovskite-type structure (space group Pbnm, #62). While the Mössbauer spectroscopic data seem to support the Rh 2 O 3 -II-type structure, the powder diffraction data collected by different groups at different synchrotron facilities over the last several decades were not able to unambiguously assign the structural type (see references in [24][25][26]). We compressed a single crystal of hematite Fe 2 O 3 in a DAC loaded with Ne as the pressure-transmitting medium to 25.6(5) GPa and collected the X-ray diffraction data in 40 • ω-scans with a 0.5 • step.…”

Section: Structure Of a High Pressure Fe 2 O 3 Polymorphmentioning

confidence: 99%

“…Due to its significance in the solid state and mineral physics, the high pressure behavior of Fe 2 O 3 has been intensively investigated (see [25][26][27] and references therein). On compression at ambient temperature above 50 GPa, it undergoes a sluggish structural phase transition [24][25][26] into a phase with an orthorhombic symmetry. The same phase has been reported [25] to appear upon heating above about 30 GPa.…”

Section: Structure Of a High Pressure Fe 2 O 3 Polymorphmentioning

confidence: 99%

Single-crystal X-ray diffraction at megabar pressures and temperatures of thousands of degrees

Dubrovinsky

Boffa-Ballaran

Glazyrin

et al. 2010

High Pressure Research

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The most reliable information about crystal structures and their response to changes in pressure and temperature is obtained from single-crystal diffraction experiments. We have developed a methodology to perform single-crystal X-ray diffraction experiments in laser-heated diamond anvil cells and demonstrate that structural refinements and accurate measurements of the thermal equation of state of metals, oxides and silicates from single-crystal intensity data are possible in pressures ranging up to megabars and temperatures of thousands of degrees. A new methodology was applied to solve the in situ high pressure, high temperature structure of iron oxide and study structural variations of iron and aluminum bearing silicate perovskite at conditions of the Earth's lower mantle.

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Electronic and magnetic structures of the postperovskite-type Fe ₂ O ₃ and implications for planetary magnetic records and deep interiors

Cited by 65 publications

References 40 publications

Symmetrization driven spin transition in ε-FeOOH at high pressure

Symmetrization driven spin transition in ε-FeOOH at high pressure

High-pressure studies with x-rays using diamond anvil cells

Single-crystal X-ray diffraction at megabar pressures and temperatures of thousands of degrees

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Electronic and magnetic structures of the postperovskite-type Fe 2 O 3 and implications for planetary magnetic records and deep interiors

Cited by 65 publications

References 40 publications

Symmetrization driven spin transition in ε-FeOOH at high pressure

Symmetrization driven spin transition in ε-FeOOH at high pressure

High-pressure studies with x-rays using diamond anvil cells

Single-crystal X-ray diffraction at megabar pressures and temperatures of thousands of degrees

Contact Info

Product

Resources

About

Electronic and magnetic structures of the postperovskite-type Fe ₂ O ₃ and implications for planetary magnetic records and deep interiors