<i>In situ</i>x-ray diffraction of fast compressed iron: Analysis of strains and stress under non-hydrostatic pressure

Konôpková, Zuzana; Rothkirch, André; Singh, Anil K.; Speziale, S.; Liermann, Hanns‐Peter

doi:10.1103/physrevb.91.144101

Cited by 27 publications

(19 citation statements)

References 38 publications

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“…Thus, in order to get reliable EOS parameters for multiphase materials, special attention must be paid in order to reveal their true compressional behavior. While our study is not the first in highlighting the manifestation of nonhydrostatic conditions or the effect of pressure medium deviation from hydrostaticity [ Marquardt et al ., ; Dorfman et al ., ; Anzellini et al ., ; Konôpková et al ., ], to the best of our knowledge, we are the first to highlight substantial complications in the case of multiphase materials (e.g., with phases welded one to another and/or with significant differences in elastic properties).…”

Section: Resultsmentioning

confidence: 91%

Compression of a multiphase mantle assemblage: Effects of undesirable stress and stress annealing on the iron spin state crossover in ferropericlase

et al. 2016

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Using synchrotron‐based X‐ray diffraction, we explore characteristic signatures for nonhydrostatic stresses and their effect on the spin state crossover of ferrous iron in (Mg, Fe)O ferropericlase (Fp) upon compression in a two‐phase mixture which includes an Al‐ and Fe‐bearing bridgmanite (Bm). We observe an influence of nonhydrostatic stresses on the spin state crossover starting pressure and width. The undesirable stresses discussed here include uniaxial deviatoric stress evolving in the diamond anvil cell and effects of intergrain interaction. While the former leads to a pressure overestimation, the latter one lowers the pressure of the onset for the high‐spin to low‐spin electronic transition in Fe2+ in ferropericlase (Mg, Fe)O with respect to hydrostatic conditions.

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Section: Resultsmentioning

confidence: 91%

Compression of a multiphase mantle assemblage: Effects of undesirable stress and stress annealing on the iron spin state crossover in ferropericlase

et al. 2016

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“…The experimental data were surveyed using the P02 Processing Tool (Konopkova et al. ; Rothkirch, personal communication). This software provided an online tool to quickly process and plot the one‐dimensional diffraction patterns as a function of frame number and, thus, time to create two‐ and three‐dimensional contour plots.…”

Section: Experimental Methodsmentioning

confidence: 99%

High‐pressure phase transitions of α‐quartz under nonhydrostatic dynamic conditions: A reconnaissance study at PETRA III

Carl

Mansfeld

Liermann³

et al. 2017

Meteorit & Planetary Scien

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Hypervelocity collisions of solid bodies occur frequently in the solar system and affect rocks by shock waves and dynamic loading. A range of shock metamorphic effects and high‐pressure polymorphs in rock‐forming minerals are known from meteorites and terrestrial impact craters. Here, we investigate the formation of high‐pressure polymorphs of α‐quartz under dynamic and nonhydrostatic conditions and compare these disequilibrium states with those predicted by phase diagrams derived from static experiments under equilibrium conditions. We create highly dynamic conditions utilizing a mDAC and study the phase transformations in α‐quartz in situ by synchrotron powder X‐ray diffraction. Phase transitions of α‐quartz are studied at pressures up to 66.1 and different loading rates. At compression rates between 0.14 and 1.96 GPa s−1, experiments reveal that α‐quartz is amorphized and partially converted to stishovite between 20.7 GPa and 28.0 GPa. Therefore, coesite is not formed as would be expected from equilibrium conditions. With the increasing compression rate, a slight increase in the transition pressure occurs. The experiments show that dynamic compression causes an instantaneous formation of structures consisting only of SiO6 octahedra rather than the rearrangement of the SiO4 tetrahedra to form a coesite. Although shock compression rates are orders of magnitude faster, a similar mechanism could operate in impact events.

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“…Phase transformation pathways are strongly influenced by the time dependence of the driving mechanism (compression, thermal transfer, strain, irradiation, etc.). This rapid compression and decompression capability allows studies of the nucleation of phase transitions, phase growth, and metastable phases at various compression rates [104,106,110,111]. In particular, this capability covers the region of compression rates between static techniques (DACs and LVPs) and dynamic shock-driven devices (gas guns, explosive, magnetic pulse compression, and laser shock), a region that has been sparsely explored.…”

Section: Rapid Compression and Decompressionmentioning

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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In situx-ray diffraction of fast compressed iron: Analysis of strains and stress under non-hydrostatic pressure

Cited by 27 publications

References 38 publications

Compression of a multiphase mantle assemblage: Effects of undesirable stress and stress annealing on the iron spin state crossover in ferropericlase

Compression of a multiphase mantle assemblage: Effects of undesirable stress and stress annealing on the iron spin state crossover in ferropericlase

High‐pressure phase transitions of α‐quartz under nonhydrostatic dynamic conditions: A reconnaissance study at PETRA III

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

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