Structural Diversity of Sodium

Gregoryanz, Eugene; Lundegaard, L. F.; McMahon, M. I.; Guillaume, Christophe L.; Nelmes, R. J.; Mézouar, M.

doi:10.1126/science.1155715

Cited by 159 publications

(161 citation statements)

References 23 publications

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“…Single-crystal structural refinement is necessary [192] but successful examples of growth and preservation of several µm-size single crystals above 100 GPa are extremely rare [79,193]. With the developments of micro-beam technology using SR, the minimal size needed for single-crystal diffraction has been reduced to sub-µm.…”

Section: Hp Multiple Grain Xrdmentioning

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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Section: Hp Multiple Grain Xrdmentioning

confidence: 99%

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

2016

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“…Light elements in this regime tend to show structural diversity, [29][30][31] low-frequency vibrational modes 22,32 , and low melting temperatures. 30,31 This is the consequence of proton zero point energy becoming the important energy scale because of a decline of the intramolecular bonding (e.g., Refs. 22,31 ).…”

Section: (B)]mentioning

confidence: 99%

Bonding, structures, and band gap closure of hydrogen at high pressures

et al. 2013

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We have studied dense hydrogen and deuterium experimentally up to 320 GPa and using ab initio molecular dynamic (MD) simulations up to 370 GPa between 250 and 300 K. Raman and optical absorption spectra show significant anharmonic and quantum effects in mixed atomic and molecular dense phase IV of hydrogen. In agreement with these observations, ab initio MD simulations near 300 K show extremely large atomic motions, which include molecular rotations, hopping and even pair fluctuations suggesting that phase IV may not have a well-defined crystalline structure. The structurally diverse layers (molecular and graphene-like) are strongly coupled thus opening an indirect band gap; moreover, at 300 GPa we find fast synchronized intralayer structural fluctuations. At 370 GPa the mixed structure collapses to form a metallic molecular Cmca-4 phase, which exhibit a new interstitial valence charge bonding scheme.Comment: Main manuscript: 20 pages, 13 figure

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“…Mössbauer, infrared and Raman spectroscopy, as well as resistivity, X-ray diffraction and inelastic scattering measurements [1][2][3][4][5][6][7][8][9]. In particular, single-crystal X-ray diffraction of samples loaded in DACs provide the most reliable data to determine the equation of state and structural changes of materials at elevated pressures [9,10].…”

Section: Introductionmentioning

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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Structural Diversity of Sodium

Cited by 159 publications

References 23 publications

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

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

Bonding, structures, and band gap closure of hydrogen at high pressures

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

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