Super high resolution powder diffractometer at J-PARC

Torii, Shuki; Kamiyama, T.; Muroya, Takashi; Sato, Seiichi; Sagehashi, Hidenori; Kobayashi, Yoshihiro; Suzuki, J.; Nagai, Masataka; Muto, Shinzo; Oikawa, K.; Mori, Kouichi; Yonemura, Masao; Ishigaki, Tōru; Ikeda, Shu Ichi

doi:10.1107/s0108767308093628

Cited by 8 publications

(15 citation statements)

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“…4). This structure was obtained by the Rietveld refinement of the neutron-diffraction data measured in situ at 973 K with a super-high-resolution diffractometer, SuperHRPD 58,59 . The tetragonal structure of CsBi 2 Ti 2 NbO 10−δ consists of an oxide-ion conducting inner perovskite Bi-(Ti 0.804 Nb 0.196 )O 3−3δ/10 layer, two outer perovskite Bi-(Ti 0.598 Nb 0.402 )O 3−3δ/10 layers, and an insulating CsO 1−δ/10 rocksalt layer ( Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The absorption correction was performed through the empirical formula given by Rouse and Cooper 68 . High-temperature neutron-diffraction measurements were carried out in vacuum using a super-high-resolution time-of-flight neutron diffractometer (SuperHRPD) installed at the Materials and Life Science Experimental Facility of J-PARC, Japan 58,59 . The absorption correction was performed using the method given by Rouse and Cooper 68 .…”

Section: Discussionmentioning

confidence: 99%

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Oxide-ion conduction in the Dion–Jacobson phase CsBi2Ti2NbO10−δ

et al. 2020

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Oxide-ion conductors have found applications in various electrochemical devices, such as solid-oxide fuel cells, gas sensors, and separation membranes. Dion-Jacobson phases are known for their rich magnetic and electrical properties; however, there have been no reports on oxide-ion conduction in this family of materials. Here, for the first time to the best of our knowledge, we show the observation of fast oxygen anionic conducting behavior in CsBi 2-Ti 2 NbO 10−δ. The bulk ionic conductivity of this Dion-Jacobson phase is 8.9 × 10 −2 S cm −1 at 1073 K, a level that is higher than that of the conventional yttria-stabilized zirconia. The oxygen ion transport is attributable to the large anisotropic thermal motions of oxygen atoms, the presence of oxygen vacancies, and the formation of oxide-ion conducting layers in the crystal structure. The present finding of high oxide-ion conductivity in rare-earth-free CsBi 2 Ti 2 NbO 10−δ suggests the potential of Dion-Jacobson phases as a platform to identify superior oxide-ion conductors.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Oxide-ion conduction in the Dion–Jacobson phase CsBi2Ti2NbO10−δ

et al. 2020

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“…Research Complex (J-PARC), Japan, using Super High Resolution Powder Diffractometer (SuperHRPD) 57 . The measurement was done at room temperature for 24 hours.…”

Section: Characterization the Powder Neutron Diffraction Experiments mentioning

confidence: 99%

Electronic structure, thermodynamic stability and high-temperature sensing properties of Er-α-SiAlON ceramics

Kshetri

Kamiyama

Torii

et al. 2020

Sci Rep

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α-SiAlon ceramics have been in use as engineering ceramics in the most arduous industrial environments such as molten metal handling, cutting tools, gas turbine engines, extrusion molds, thermocouple sheaths, protective cover for high-temperature sensors, etc., owing to their outstanding mechanical, thermal and chemical stability. taking advantage of the intrinsic properties of α-SiAlons, we investigate, in this paper, the possibility of using the er-doped α-SiAlon (er-α-SiAlon) ceramic as a high-temperature sensing material via its unique near-infrared to visible upconversion property. We first use neutron diffraction and density functional theory calculations to study the electronic structure and thermodynamic stability of er-α-SiAlon. it is found that the interstitial doping of er stabilizes the α-SiAlON structure via chemical bonds with O-atoms with N:O ratio of 5:2 in the sevenfold coordination sites of the er 3+ ion. temperature-dependent upconversion emissions are then studied under 980 and 793 nm excitations over a temperature range of 298-1373 K and the fluorescence intensity ratio (fiR) technique has been employed to investigate the temperature sensing behavior. temperature-dependent Raman behavior is also investigated. We demonstrate that using er-α-SiAlon as a sensing material, the limit of temperature measurement via the fiR technique can be pushed well beyond 1200 K. SiAlON ceramics are high-performance refractory ceramics which are manufactured by combining raw materials silicon nitride, alumina, aluminum nitride along with the oxide of rare earth elements. The SiAlON ceramics exist in two basic forms; each form is isostructural with one of the two common forms of Si 3 N 4. In α-SiAlON, Si in the tetrahedral structure in Si 3 N 4 is replaced by Al with limited substitution of N by O. Valancy requirements are satisfied by modifying cations occupying the interstitial holes at (1/3, 2/3, z) and (2/3, 1/3, ½ + z) per unit cell of the α-Si 3 N 4 1. In this way cations of yttrium (Y), calcium (Ca), lithium (Li), neodymium (Nd), Erbium (Er), etc., for example, can be incorporated into the structure. Consequently, α-SiAlON has the general formula M x v+ Si 12−m−n Al m+n O n N 16−n where x = m/v and M is the metal cation 1. The interstitial dissolution of the M ion stabilizes the α-SiAlON structure and the cations M are coordinated by seven (N, O) atom sites 2,3. α-SiAlON ceramics are widely used for high-temperature and high-endurance applications owing to their ability to withstand high structural loads and their excellent thermal and chemical stability 4,5. Taking advantage of their superior mechanical, thermal and chemical stabilities, these materials have also been investigated recently for the possibility of functional applications such as downshifting phosphor materials for solid-state lighting 6. In another aspect of investigating the functional properties of these ceramics, we recently reported efficient near-infrared to visible frequency upconversion in lanthanides (Ln 3+)-doped α-SiAlON ceramics ...

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“…A collimator was additionally placed between the monochromator and the crystal to reduce vertical beam divergence. 10 B rubber sheets were used to absorb neutron background. The experiment started with a measurement of the secondary beam with the standard HEiDi detector, a 3 He counter tube with a pressure of 5 bar, a 4 mm Alumina entrance window and an active length of 170 mm (Eurisys 73NH17/5X).…”

Section: Measurementsmentioning

confidence: 99%

“…The combined neutron imaging and neutron diffraction beamline IMAT, currently under construction at the ISIS facility [14], and the POLDI diffractometer operational at the Swiss spallation source SINQ at PSI [42,43,45], are examples of instruments that will be populated with scintillator modules combining the latest achievements in the field of photosensors or signal readout. WISH (ISIS), NOMAD (SNS), TAIKAN and SuperHRPD (J-PARC) are examples of diffractometers operated with hundreds of 3 He-filled position-sensitive tubes surrounding the sample [8,10,46,47,48]. Tubes with diameters of 25, 12.5 or 8 mm and lengths of 1 m or less are mounted in panels of eight or ten, which can be arranged in several ways with respect to the scattering plane.…”

Section: Introductionmentioning

confidence: 99%

Neutron detectors for the ESS diffractometers

et al. 2017

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The ambitious instrument suite for the future European Spallation Source whose civil construction started recently in Lund, Sweden, demands a set of diverse and challenging requirements for the neutron detectors. For instance, the unprecedented high flux expected on the samples to be investigated in neutron diffraction or reflectometry experiments requires detectors that can handle high counting rates, while the investigation of sub-millimeter protein crystals will only be possible with large-area detectors that can achieve a position resolution as low as 200 µm. This has motivated an extensive research and development campaign to advance the state-of-the-art detector and to find new technologies that can reach maturity by the time the ESS will operate at full potential. This paper presents the key detector requirements for three of the Time-of-Flight (TOF) diffraction instrument concepts selected by the Scientific Advisory Committee to advance into the phase of preliminary engineering design. We discuss the detector technologies commonly employed at the existing similar instruments and their major challenges for ESS. The detector technologies selected by the instrument teams to collect the diffraction patterns are also presented. Analytical calculations, Monte-Carlo simulations, and real experimental data are used to develop a generic method to estimate the event rate in the diffraction detectors. We apply this method to make predictions for the future diffraction instruments, and thus provide additional information that can help the instrument teams with the optimisation of the detector designs.

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Super high resolution powder diffractometer at J-PARC

Abstract: A large-scale, high-efficiency and low-cost platform for structural genomics studies". Acta Crystallogr D Biol Crystallogr. (2006) 62 (8):843-51

Cited by 8 publications

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Oxide-ion conduction in the Dion–Jacobson phase CsBi2Ti2NbO10−δ

Oxide-ion conduction in the Dion–Jacobson phase CsBi2Ti2NbO10−δ

Electronic structure, thermodynamic stability and high-temperature sensing properties of Er-α-SiAlON ceramics

Neutron detectors for the ESS diffractometers

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