Wide Band Energy Beamline using Si (111) Crystal Monochromators at BL22XU in SPring-8

Shobu, Takahisa; Tozawa, K.; Shiwaku, Hideaki; Konishi, Hisatoshi; Inami, Toshiya; Harami, T.; Мizuki, J.

doi:10.1063/1.2436207

Cited by 39 publications

(26 citation statements)

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“…Monochromatized X‐rays (37.7 keV at BL20XU, 35 keV at BL22XU, and 51 keV at BL04B1), which were tuned by Si (111) or Si (311) double‐crystal monochromators, were used (Shobu et al, ; Suzuki et al, ). The energies of the X‐rays were optimized from the sample size to obtain appropriate X‐ray absorption contrasts.…”

Section: Methodsmentioning

confidence: 99%

Pressure and Composition Effects on Sound Velocity and Density of Core‐Forming Liquids: Implication to Core Compositions of Terrestrial Planets

et al. 2019

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A compositional variety of planetary cores provides insight into their core/mantle evolution and chemistry in the early solar system. To infer core composition from geophysical data, a precise knowledge of elastic properties of core‐forming materials is of prime importance. Here, we measure the sound velocity and density of liquid Fe‐Ni‐S (17 and 30 at% S) and Fe‐Ni‐Si (29 and 38 at% Si) at high pressures and report the effects of pressure and composition on these properties. Our data show that the addition of sulfur to iron substantially reduces the sound velocity of the alloy and the bulk modulus in the conditions of this study, while adding silicon to iron increases its sound velocity but has almost no effect on the bulk modulus. Based on the obtained elastic properties combined with geodesy data, S or Si content in the core is estimated to 4.6 wt% S or 10.5 wt% Si for Mercury, 9.8 wt% S or 18.3 wt% Si for the Moon, and 32.4 wt% S or 30.3 wt% Si for Mars. In these core compositions, differences in sound velocity profiles between an Fe‐Ni‐S and Fe‐Ni‐Si core in Mercury are small, whereas for Mars and the Moon, the differences are substantially larger and could be detected by upcoming seismic sounding missions to those bodies.

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Section: Methodsmentioning

confidence: 99%

Pressure and Composition Effects on Sound Velocity and Density of Core‐Forming Liquids: Implication to Core Compositions of Terrestrial Planets

et al. 2019

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“…In situ X‐ray scattering experiments were carried out employing high‐energy X‐rays ( E = 69.8 KeV, λ = 0.1776 Å) at BL22XU in SPring‐8 (Hyogo, Japan) . The large imaging plate (IP) detector (RIGAKU R‐AXIS V pixel size: ~0.1 mm, Akishima, Tokyo, Japan) with the size of 400 × 400 mm 2 equipped on the diffractometer enabled us to obtain the X‐ray total scattering up to Q max ~20 Å −1 with 70 keV X‐rays .…”

Section: Methodsmentioning

confidence: 99%

Pair distribution function analysis of nanostructural deformation of calcium silicate hydrate under compressive stress

et al. 2017

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Despite enormous interest in calcium silicate hydrate (C-S-H), its detailed atomic structure and intrinsic deformation under an external load are lacking. This study demonstrates the nanostructural deformation process of C-S-H in tricalcium silicate (C 3 S) paste as a function of applied stress by interpreting atomic pair distribution function (PDF) based on in situ X-ray scattering. Three different strains in C 3 S paste under compression were compared using a strain gauge, Bragg peak shift, and the real space PDF. PDF refinement revealed that the C-S-H phase mostly contributed to PDF from 0 to 20 A whereas crystalline phases dominated that beyond 20 A. The short-range atomic strains exhibited two regions for C-S-H: I) plastic deformation (0-10 MPa) and II) linear elastic deformation (>10 MPa), whereas the long-range deformation beyond 20 A was similar to that of Ca(OH) 2 . Below 10 MPa, the short-range strain was caused by the densification of C-S-H induced by the removal of interlayer or gel-pore water. The strain is likely to be recovered when the removed water returns to C-S-H. K E Y W O R D Scalcium silicate hydrate, deformation, portland cement, X-ray methods

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“…The pressure in the sample chamber was monitored by measuring the fluorescence spectra [14] from ruby balls pressurized with the sample in the hydrogen medium. X-ray diffraction measurements were conducted at beamline BL22XU, SPring-8 [15,16]. The incident beam, monochromatic X-rays tuned to 25.06 keV (wave length λ = 0.4948Å), was collimated to 20 m × 20 m so that just the sample area was irradiated to obtain a high S/N ratio or high quality diffraction data.…”

Section: Methodsmentioning

confidence: 99%

Pressure-induced structural change from hexagonal to fcc metal lattice in scandium trihydride

Ohmura

Machida

Watanuki

et al. 2007

Journal of Alloys and Compounds

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Wide Band Energy Beamline using Si (111) Crystal Monochromators at BL22XU in SPring-8

Cited by 39 publications

References 0 publications

Pressure and Composition Effects on Sound Velocity and Density of Core‐Forming Liquids: Implication to Core Compositions of Terrestrial Planets

Pressure and Composition Effects on Sound Velocity and Density of Core‐Forming Liquids: Implication to Core Compositions of Terrestrial Planets

Pair distribution function analysis of nanostructural deformation of calcium silicate hydrate under compressive stress

Pressure-induced structural change from hexagonal to fcc metal lattice in scandium trihydride

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