A new technique for angle-dispersive powder diffraction using an energy-dispersive setup and synchrotron radiation

Wang, Yanbin; Uchida, Takeyuki; Dreele, R. Von; Rivers, Mark L.; Nishiyama, Norimasa; Funakoshi, Kengo; Nozawa, Akifumi; Kaneko, Hiroshi

doi:10.1107/s0021889804022502

Cited by 48 publications

(35 citation statements)

References 15 publications

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“…Energy‐dispersive X‐ray diffraction using a CAESAR‐type diffractometer (Wang et al, ) was used to determine the sample pressure and verify the sample state. We use the pressure–volume–temperature equation of state of MgO to determine the sample pressure and the accuracy of pressure determination is estimated to be ~0.5 GPa.…”

Section: Methodsmentioning

confidence: 99%

Thermal Conductivity of FeS and Its Implications for Mercury's Long‐Sustaining Magnetic Field

et al. 2019

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The MESSENGER mission revealed that Mercury's magnetic field might have operated since 3.7–3.9 Ga. While the intrinsic magnetism suggests an active dynamo within Mercury's core, the mechanism that is responsible for sustaining the dynamo for prolonged period of time remains unknown. Here we investigated the electrical conductivity of Fe‐S alloys at pressure of 8 GPa and temperatures up to 1,700 K. We show that the electrical conductivity of Fe‐S alloys at 1,500 K is about 103 S/m, 2 orders of magnitude lower than the previously assumed value for dynamo calculations. The thermal conductivity was estimated using the Wiedemann‐Franz law. The total thermal conductivity of FeS is estimated to be ~4 Wm/K at the Mercurian core‐mantle boundary conditions. The low thermal conductivity suggests that a thermally driven dynamo operating on Mercury is more likely than expected. If coupled with chemical buoyancy sources, it is possible to sustain an intrinsic dynamo during time scales compatible with the MESSENGER observations.

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Section: Methodsmentioning

confidence: 99%

Thermal Conductivity of FeS and Its Implications for Mercury's Long‐Sustaining Magnetic Field

et al. 2019

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“…(1) Angle dispersive powder diffraction with polychromatic x-ray source [CAESER (Ref. 25)]: the accurate and wide angular accessibility of the present device enables us to achieve more precise structure refinement for a crystalline phase at high-pressure and temperature. (2) High-pressure x-ray microtomography.…”

Section: Future Workmentioning

confidence: 99%

High-pressure x-ray diffraction studies on the structure of liquid silicate using a Paris–Edinburgh type large volume press

Yamada

Wang

Inoue

et al. 2011

Review of Scientific Instruments

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An experimental setup for high-pressure liquid structure studies with synchrotron x-ray diffraction using the Paris-Edinburgh press has been installed at station 16-BM-B (HPCAT) of the Advanced Photon Source, Argonne National Laboratory. By collecting energy-dispersive data with a synchrotron white beam at various 2θ angles, the present device allows us to obtain the structure factor, S(Q), over a wide range of Q ( = 4πsinθ∕λ) owing to the excellent angular accessibility up to 37° in 2θ and high energy photons well beyond 100 keV. We have successfully collected XRD data on silicate (albite, NaAlSi(3)O(8)) liquids with Q up to ∼22 Å(-1) and pressure up to 5.3 GPa and temperature 1873 K, and obtained the radial distribution function, G(r), with a reasonable resolution. The T-O bond length (where T = Al, Si), which is a fundamental measure of local structure for aluminous silicate consisting of SiO(n) and AlO(n) polyhedra (tetrahedra at 1 atm condition), was found to be slightly shortened to 1.626 Å compared to that of glass at 1 atm. The T-O-T bound angle, which is the linkage of the above polyhedra, is the most responsible for densification. The T-O-T peak in G(r) splits into two peaks, suggesting a differentiation of the bond angle at high-pressure. The present technical development demonstrates that the Paris-Edinburgh press is suitable for studies of silicate liquids under high-pressure conditions.

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“…Consequently, EDXRD may not provide reliable intensity measurements, making it difficult to obtain crystal structure information such as bonding characteristics and atomic positions. A technique has been developed for large volume presses by employing both ADXRD and EDXRD concepts [175]. By scanning an energy-calibrated multichannel solid state detector, a large number of EDXRD patterns are obtained at pre-determined angular step-size.…”

Section: Hp Energy Dispersive 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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A new technique for angle-dispersive powder diffraction using an energy-dispersive setup and synchrotron radiation

Cited by 48 publications

References 15 publications

Thermal Conductivity of FeS and Its Implications for Mercury's Long‐Sustaining Magnetic Field

Thermal Conductivity of FeS and Its Implications for Mercury's Long‐Sustaining Magnetic Field

High-pressure x-ray diffraction studies on the structure of liquid silicate using a Paris–Edinburgh type large volume press

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

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