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Journal Articles

Anisotropic thermal lattice expansion and crystallographic structure of strontium aluminide within Al-10Sr alloy as measured by in-situ neutron diffraction

Liss, K.-D.*; Harjo, S.; Kawasaki, Takuro; Aizawa, Kazuya; Xu, P. G.

Journal of Alloys and Compounds, 869, p.159232_1 - 159232_9, 2021/07

 Times Cited Count:2 Percentile:55.11(Chemistry, Physical)

Journal Articles

Crystal structure and magnetic properties of new ternary uranium compound U$$_3$$TiBi$$_9$$

Motoyama, Gaku*; Haga, Yoshinori; Yamaguchi, Akira*; Kawasaki, Ikuto*; Sumiyama, Akihiko*; Yamamura, Tomoo*

Progress in Nuclear Science and Technology (Internet), 5, p.157 - 160, 2018/11

Journal Articles

Local structure analysis of ZrN, and Dy$$_{0.5}$$Zy$$_{0.5}$$N surrogate materials for fast reactor nitride fuel

Yoneda, Yasuhiro; Tsuji, Takuya; Matsumura, Daiju; Okamoto, Yoshihiro; Takaki, Seiya; Takano, Masahide

Transactions of the Materials Research Society of Japan, 42(2), p.23 - 26, 2017/04

ZnN is a possible candidate for the diluent material for nitride fuels containing transuranium elements. Pellets of inert matrix material ZrN, and surrogate nitride fuel material Dy$$_{0.5}$$Zr$$_{0.5}$$N, are fabricated for the purpose of investigating the crystal structure. Lattice parameters of Dy$$_{1-x}$$Zr$$_x$$N followed the Vegard's low, in spite of the large lattice mismatch ($$sim$$ 7%) between DyN and ZrN. Local structure analysis was performed by X-ray absorption fine structure (XAFS) and atomic pair-distribution function (PDF) methods. The Zr-N nearest neighbor bond distance changed as changing the Dy composition. The complex local structure of DyN and ZrN is related to the preferable effects of ZrN.

Journal Articles

Deuteron ordering in ice containing impurities; A Neutron diffraction study

Fukazawa, Hiroshi; Hoshikawa, Akinori; Yamauchi, Hiroki; Yamaguchi, Yasuo*; Igawa, Naoki; Ishii, Yoshinobu

Physica B; Condensed Matter, 385-386(1), p.113 - 115, 2006/11

 Times Cited Count:3 Percentile:18.57(Physics, Condensed Matter)

We measured neutron diffraction of powdered samples of ice containing impurities (e.g., potassium deuteroxide, sodium deuteroxide) to analyze the formation of ice XI, a deuterium-ordered phase of ice, from ice Ih, a disordered phase. We found that the diffraction profiles changed with time for several days at 62-70 K, which are below the transition temperature $$T$$$$_{rm c}$$ = 76 K. From the Rietveld analysis of the diffraction profiles, we determined the change of the structural parameters with the phase transition. The structural analysis provides direct evidence for the existence of deuteron-ordered arrangements in ice containing impurities below $$T$$$$_{rm c}$$. On the basis of the Rietveld analysis, we obtained the mass fraction ($$f$$) of ice XI as functions of time and temperature. We report a structural observation for the nucleation and growth of ice XI under various conditions (such as temperature variations and impurity effects), which leads to understand whether or not f reaches unity at an infinite annealing time.

Journal Articles

A Neutron crystallographic analysis of a rubredoxin mutant at 1.6 ${AA}$ resolution

Chatake, Toshiyuki*; Kurihara, Kazuo; Tanaka, Ichiro*; Tsyba, I.*; Bau, R.*; Jenney, F. E. Jr.*; Adams, M. W. W.*; Niimura, Nobuo

Acta Crystallographica Section D, 60(8), p.1364 - 1373, 2004/08

 Times Cited Count:33 Percentile:89.05(Biochemical Research Methods)

A neutron diffraction study has been carried out at 1.6 ${AA}$ resolution on a mutant rubredoxin from ${it Pyrococcus furiosus}$ using the BIX-3 single-crystal diffractometer at the JRR-3 reactor of JAERI. In order to study the unusual thermostability of rubredoxin from ${it P. furiosus}$, the hydrogen-bonding patterns were compared between the native and a 'triple-mutant' variant where three residues were changed so that they are identical to those in a mesophilic rubredoxin. In the present study, some minor changes were found between the wild-type and mutant proteins in the hydrogen-bonding patterns of the Trp3/Tyr3 region. The H/D-exchange ratios in the protein were also studied. The results suggest that the backbone amide bonds near the four Cys residues of the FeS$$_{4}$$ redox center are most resistant to H/D exchange. In addition, the 1.6 ${AA}$ resolution of the present neutron structure determination has revealed a more detailed picture than previously available of some portions of the water structure, including ordered and disordered O-D bonds.

Journal Articles

Neutron crystallographic study on rubredoxin from ${it Pyrococcus furiosus}$ by BIX-3, a single-crystal diffractometer for biomacromolecules

Kurihara, Kazuo; Tanaka, Ichiro*; Chatake, Toshiyuki*; Adams, M. W. W.*; Jenney, F. E. Jr.*; Moiseeva, N.*; Bau, R.*; Niimura, Nobuo

Proceedings of the National Academy of Sciences of the United States of America, 101(31), p.11215 - 11220, 2004/08

 Times Cited Count:47 Percentile:61.94(Multidisciplinary Sciences)

The structure of a rubredoxin (Rd) from ${it Pyrococcus furiosus}$, an organism that grows optimally at 100 $$^{circ}$$C, was determined using the neutron single-crystal diffractometer for biological macromolecules (BIX-3) at the JRR-3 reactor of JAERI. Data were collected at room temperature up to a resolution of 1.5 ${AA}$, and the completeness of the data set was 81.9 %. The model contains 306 H atoms and 50 D atoms. A total of 37 hydration water molecules were identified. The model has been refined to final agreement factors of ${it R}$ = 18.6 % and ${it R}$$$_{free}$$ = 21.7 %. Several orientations of the O-D bonds of side chains, whose assignments from X-ray data were previously ambiguous, were clearly visible in the neutron structure. While most backbone N-H bonds had undergone some degree of H/D exchange throughout the molecule, five H atom positions still had distinctly negative (H) peaks. The neutron Fourier maps clearly showed the details of an extensive set of H bonds involving the ND$$_{3}$$$$^{+}$$ terminus that may contribute to the unusual thermostability of this molecule.

Journal Articles

High performance neutron diffractometer for biomacromolecules

Niimura, Nobuo; Kurihara, Kazuo; Tanaka, Ichiro

Kagaku, 59(2), p.46 - 47, 2004/02

no abstracts in English

Journal Articles

Replication of individual snow crystals for their subsequent chemical analysis using micro-PIXE

Kasahara, Mikio*; Ma, C.-J.*; Okumura, Motonori*; Kojima, Takuji; Hakoda, Teruyuki; Sakai, Takuro; Arakawa, Kazuo

JAERI-Review 2003-033, TIARA Annual Report 2002, p.270 - 272, 2003/11

A snow crystal scavenges earozol particles and trasfer various elements in atomosphere through heterogenious nucleation. The snow has many complicated crystal shapes which results in difficulty in comparison of its environmental purification function directly with that of raindrops. The replica of individual snow crystal grain was prepared by their immobilization on the collodion film. The replica samples were analized by micro-PIXE at JAERI and PIXE st Kyoto university. The following results are obtained: (1) Size(circumscribed diameter) of individual snow crystal are in the range of 0.12-2.5mm, (2)snow crystal grows from hexagnal plate to dendritic sectored plate, (3) major elements captured by a snow crystal are Si,S,K,Ca,Fe,S, (4)there is relation between snow crystal size and captured-element masses. The result leads us to presume the chemical inner-structure and the elemental mixing state in/on single snow crystal.

Journal Articles

Correlation of crystal structures with electric field gradients in the fluorite- and pyrochlore-type compounds in the Gd$$_{2}$$O$$_{3}$$-ZrO$$_{2}$$ system

Wang, J.*; Otobe, Haruyoshi; Nakamura, Akio; Takeda, Masuo*

Journal of Solid State Chemistry, 176(1), p.105 - 110, 2003/11

 Times Cited Count:13 Percentile:43.44(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Crystal distortion and magnetic structure of $$gamma$$-MnPt alloys

Hori, Tomiei*; Tsuchiya, Yoshinori; Shiraishi, H.*; Ishii, Yoshinobu; Hojo, Kiichi

Applied Physics A, 74(Suppl.1), p.S743 - S745, 2002/12

 Times Cited Count:3 Percentile:16.63(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

High-quality epitaxial TiO$$_{2}$$ thin films grown on $$alpha$$-Al$$_{2}$$O$$_{3}$$ substrates by pulsed laser deposition

Shinohara, Ryuji*; Yamaki, Tetsuya; Yamamoto, Shunya; Ito, Hisayoshi; Asai, Keisuke*

Journal of Materials Science Letters, 21(12), p.967 - 969, 2002/06

 Times Cited Count:9 Percentile:37.73(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Preparation of epitaxial TiO$$_{2}$$ films by PLD for photocatalyst applications

Yamaki, Tetsuya; Sumita, Taishi; Yamamoto, Shunya; Miyashita, Atsumi

Journal of Crystal Growth, 237-239(Part1), p.574 - 579, 2002/04

Pulsed laser deposition (PLD) with a KrF excimer laser was used to prepare epitaxial TiO$$_{2}$$ films on a (0001) sapphire substrate. The crystalline structure and surface morphology of the films were then investigated as a function of the laser power density in the PLD. X-ray diffraction and Raman spectroscopy results showed that the films were composed of the (100) oriented rutile phase with a small amount of the (001) oriented anatase. The anatase-to-rutile ratio in such phase-mixed films was controlled by the laser power; the ratio increased as the power density decreased. From atomic force microscopy observations, the film deposited at the lowest power was found to have a rough surface consisting of coarse grains. This film exhibited the best photocatalytic performance during the decomposition of the organic dyes possibly due to the maximum relative content of anatase and the large surface area.

Journal Articles

Microstructural evolution during creep of Ni-base solid solution alloys and in-situ observation at high temperature

; *; Kikuchi, Kenji; ; Miura, Takayuki*

Proc. of 4th Int. Conf. on Recrystallization and Related Phenomena (REX'99), p.283 - 288, 1999/00

no abstracts in English

Journal Articles

Local structure of (U,Zr)Pd$$_{3}$$ by EXAFS

Akabori, Mitsuo; Ogawa, Toru; Ito, Akinori; Motohashi, Haruhiko; Shiwaku, Hideaki

Journal of Alloys and Compounds, 271-273, p.363 - 366, 1998/00

 Times Cited Count:2 Percentile:28.63(Chemistry, Physical)

no abstracts in English

Journal Articles

Crystal chemistry of NpNi$$_{5}$$ compound

Akabori, Mitsuo; R.G.Haire*; J.K.Gibson*; Okamoto, Yoshihiro; Ogawa, Toru

Journal of Alloys and Compounds, 257, p.268 - 272, 1997/00

 Times Cited Count:2 Percentile:29.77(Chemistry, Physical)

no abstracts in English

Journal Articles

Lattice stability and structure of $$delta$$-UZr$$_{2}$$ at elevated temperatures

Akabori, Mitsuo; Ogawa, Toru; Ito, Akinori; Morii, Yukio

Journal of Physics; Condensed Matter, 7, p.8249 - 8257, 1995/00

 Times Cited Count:37 Percentile:86.43(Physics, Condensed Matter)

no abstracts in English

Journal Articles

Crystallographic study on the phase transition of $$alpha$$-U$$_{2}$$N$$_{3}$$

Serizawa, Hiroyuki; Fukuda, Kosaku; Ishii, Yoshinobu; Morii, Yukio; *

Journal of Nuclear Materials, 208, p.128 - 134, 1994/00

 Times Cited Count:16 Percentile:79.14(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Intensity ratio of lyman-$$alpha$$ fine-structure components of Ti XXII in the JT-60 tokamak plasma

Kubo, Hirotaka; Sakasai, Akira; Koide, Yoshihiko; Sugie, Tatsuo

Physical Review A, 46(12), p.7877 - 7881, 1992/12

 Times Cited Count:10 Percentile:54.71(Optics)

no abstracts in English

Journal Articles

Crystallographic study on the phase transition of $$alpha$$-U$$_{2}$$N$$_{3}$$

Serizawa, Hiroyuki; Fukuda, Kosaku; *

Transactions of the American Nuclear Society, 66, p.196 - 197, 1992/11

no abstracts in English

Journal Articles

Refinement of the crystal structure of [N(CH$$_{3}$$)$$_{4}$$]$$_{2}$$ZnBr$$_{4}$$ in connection with its phase transition

*; *; Geshi, Kazuo

Journal of the Physical Society of Japan, 57(12), p.4219 - 4224, 1988/12

 Times Cited Count:41 Percentile:86.9(Physics, Multidisciplinary)

no abstracts in English

35 (Records 1-20 displayed on this page)