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17 citations found for Watanuki,

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A diffractometer for powder samples of very small amount has been developed to collect high-quality diffraction patterns under extreme conditions. Performance, examples of application and practicability are presented.

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Acta Cryst. (2014). A70, C868
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Hydrogen has been considered as a promising alternative fuel for transportation, provided we can find a way to store a large amount of hydrogen in a compact way. The realization of such a storage system can be achieved by developing materials that can easily absorb, safely store, and rapidly release hydrogen repeatedly. However, there is currently no material to meet all the requirements for on board storage. Great efforts have been made to understand hydrogenation properties of currently available materials to look for a way to improve properties or to prepare new materials. However, investigating the structure of some of these materials is challenging since their hydrides are only available under hydrogen gas pressure. Furthermore, many novel materials with improved properties often show heavily disordered or nanoscale structural features which are difficult to characterize using conventional crystallographic technique alone (crystallographically challenged hydrogen storage materials). In order to investigate the structural change in crystallographically challenged hydrogen storage materials during hydrogenation or dehydrogenation processes we have developed in-situ hydrogen gas loading setup for synchrotron X-ray total scattering experiments at the Japan Atomic Energy Agency (JAEA) beamline of BL22XU [1] at SPring-8. Coupled to an area detector [1,2], this setup allows us to obtain the atomic pair distribution function (PDF) [3] of metal hydrides either in equilibrium or in non-equilibrium state with hydrogen. In this poster, we will introduce our in-situ setup and present some preliminary results on AB5-type intermetallic compounds and Pd nanoparticles.

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Acta Cryst A. (2016). A72, s159
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Acta Cryst. (2008). A64, C610
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Ta2NiSe5 has recently attracted interest as an excitonic insulator. In this paper, crystallographic parameters of three non-ambient phases are reported from across the PT phase diagram. A reversible pressure-induced structural transition above 3 GPa is associated with the coherent sliding of weakly coupled layers.


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Acta Cryst. (2005). A61, c375
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An in situ synchrotron X-ray total scattering setup has been developed that allows observation of the phase transformation in hydrogen storage materials upon hydrogenation. This setup can be used to study the change in average and local structures during hydrogen absorption–desorption reactions.

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Acta Cryst. (2014). A70, C99
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We are searching for intermediate-valence (IV) quasicrystals where IV ions are quasi-periodically arranged. Our previous study revealed that an icosahedral Au-Al-Yb quasicrystal forms an IV system [1]. X-ray absorption spectroscopy near the Yb L_3 edge indicated that the Yb ions in the quasicrystal assume a mean valence of 2.61, between a divalent state (4f^14, J = 0) and a trivalent one (4f^13, J = 7/2). Additionally we found that non-Fermi-liquid behaviour appears at low temperatures without doping, pressure, or field tuning. In this study we examined Au-M-Yb system, where M = Sn, Ge, and Ga. X-ray absorption spectroscopy measurements at SPring-8 (BL22XU) showed that each compounds forms IV system. The Yb valence values are respectively 2.27 for a Au-Sn-Yb 2/1 crystalline approximant, 2.24 for a Au-Ge-Yb 1/1 approximant, and 2.36 for a Au-Ga-Yb 1/1 approximant. By following the trend of Yb-based IV compounds, these valence values close to divalent suggest that the Yb 4f character in these compounds would be itinerant rather than localized one.

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Acta Cryst. (2002). A58, c179
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Acta Cryst. (2008). A64, C621
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The crystal structures of praseodymium silicide (5/4), Pr5Si4, and neodymium silicide (5/4), Nd5Si4, were redetermined at higher precision. These compounds are confirmed to have the tetra­gonal Zr5Si4-type structure (space group: P41212). The structure is built up by distorted body-centered cubes consisting of Pr(Nd) atoms, which are linked to each other by edge-sharing to form a three-dimensional framework. Silicon dimers are located within channels in this framework.

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The development of resonant inelastic X-ray scattering under high pressure is presented. The pressure evolution of momentum-resolved electronic excitations was obtained in single-crystalline Sr2.5Ca11.5Cu24O41.

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