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Journal Articles

Magnetic, thermal, and neutron diffraction studies of a coordination polymer; bis(glycolato)cobalt(II)

Nakane, Tomohiro*; Yoneyama, Shota*; Kodama, Takeshi*; Kikuchi, Koichi*; Nakao, Akiko*; Ohara, Takashi; Higashinaka, Ryuji*; Matsuda, Tatsuma*; Aoki, Yuji*; Fujita, Wataru*

Dalton Transactions (Internet), 48(1), p.333 - 338, 2019/01

 Times Cited Count:2 Percentile:11.62(Chemistry, Inorganic & Nuclear)

Journal Articles

Local disorder in proton conductor BaSn$$_{0.5}$$In$$_{0.5}$$O$$_{2.75}$$ analyzed by neutron diffraction/ atomic pair distribution function

Igawa, Naoki; Kodama, Katsuaki; Taguchi, Tomitsugu*; Yoshida, Yukihiko*; Matsukawa, Takeshi*; Hoshikawa, Akinori*; Ishigaki, Toru*

Transactions of the Materials Research Society of Japan, 43(6), p.329 - 332, 2018/12

For the understanding of the crystal structural effect on the electrical properties, the local disorder in BaSn$$_{0.5}$$In$$_{0.5}$$O$$_{2.75}$$ which is one of the excellent proton conductors for solid oxide fuel cells was estimated by using the Atomic Pair Distribution Function (PDF) analysis method with the neutron diffraction. The local structure is almost the same as the average structure which was estimated by the Rietveld analysis using the cubic crystal structure (space group, $${it Pm}$$$$overline{3}$$$${it m}$$) in the atomic distance range of ${it r}$ $$>$$ 6${AA}$. The PDF profile was fitted better using the tetragonal crystal structure with the space group of ${it P}$4/${it mmm}$ than those with $${it Pm}$$$$overline{3}$$$${it m}$$ in the range ${it r}$ $$<$$ 6${AA}$. Those results indicate the presence of the local disorder in the lattice. In this work, the relationship between the average and local structures of BaSn$$_{0.5}$$In$$_{0.5}$$O$$_{2.75}$$ will be discussed.

Journal Articles

3D visualization of XFEL beam focusing properties using LiF crystal X-ray detector

Pikuz, T.*; Faenov, A.*; Matsuoka, Takeshi*; Matsuyama, Satoshi*; Yamauchi, Kazuto*; Ozaki, Narimasa*; Albertazzi, B.*; Inubushi, Yuichi*; Yabashi, Makina*; Tono, Kensuke*; et al.

Scientific Reports (Internet), 5, p.17713_1 - 17713_10, 2015/12

 Times Cited Count:36 Percentile:88.1(Multidisciplinary Sciences)

Journal Articles

2D neutron diffraction imaging on an ammonite

Shamoto, Shinichi; Kodama, Katsuaki; Imaki, Tadashi*; Nakatani, Takeshi; Oshita, Hidetoshi*; Kaneko, Naokatsu*; Masuko, Kenji*; Sakamoto, Kensaku; Yamaguchi, Kenji; Suzuya, Kentaro; et al.

JPS Conference Proceedings (Internet), 1, p.014011_1 - 014011_5, 2014/03

2D neutron diffraction imaging of an ammonite fossil was carried out at high-intensity total diffractometer NOVA in J-PARC. Observed diffraction profiles consist of calcite, siderite and amorphous structures.

Journal Articles

Fast heating of cylindrically imploded plasmas by petawatt laser light

Nakamura, Hirotaka*; Sentoku, Yasuhiko*; Matsuoka, Takeshi*; Kondo, Kiminori; Nakatsutsumi, Motoaki*; Norimatsu, Takayoshi*; Shiraga, Hiroyuki*; Tanaka, Kazuo*; Kodama, Ryosuke*

Physical Review Letters, 100(16), p.165001_1 - 165001_4, 2008/04

 Times Cited Count:15 Percentile:64.43(Physics, Multidisciplinary)

We produced cylindrically imploded plasmas, which have the same density-radius product of the imploded plasma $$rho$$R with the compressed core in the fast ignition experiment and demonstrated efficient fast heating of cylindrically imploded plasmas with an ultraintense laser light. The coupling efficiency from the laser to the imploded column was 14%-21%, implying strong collimation of energetic electrons over a distance of 300 micron of the plasma. Particle-in-cell simulation shows confinement of the energetic electrons by self-generated magnetic and electrostatic fields excited along the imploded plasmas, and the efficient fast heating in the compressed region.

Journal Articles

Association of Am with humic substances isolated from river waters with different water quality

Nagao, Seiya*; Fujitake, Nobuhide*; Kodama, Hideki*; Matsunaga, Takeshi; Yamazawa, Hiromi

Journal of Radioanalytical and Nuclear Chemistry, 255(3), p.459 - 464, 2003/03

 Times Cited Count:7 Percentile:45.84(Chemistry, Analytical)

no abstracts in English

Journal Articles

Study of metallofullerenes encapsulating actinides

Akiyama, Kazuhiko; Sueki, Keisuke*; Tsukada, Kazuaki; Yaita, Tsuyoshi; Miyake, Yoko*; Haba, Hiromitsu*; Asai, Masato; Kodama, Takeshi*; Kikuchi, Koichi*; Otsuki, Tsutomu*; et al.

Journal of Nuclear and Radiochemical Sciences, 3(1), p.151 - 154, 2002/06

The oxidation state of actinide elements encapsulated in fullerenes is studied. HPLC elution behavior of actinide-fullerenes is classified into two groups; the elution behavior of the first group, encapsulating U, Np, and Am, is similar to that of the light lanthanide-fullerenes, such as La, Ce, Pr, and Nd, while the behavior of the second group, encapsulating Th and Pa, is quite different from that of any lanthanide-fullerenes. The chemical species in the main HPLC elution peak of each group were identified as M@C82 and M@C84 (M = metal atom) from the mass of the U and Th fullerenes, respectively. The oxidation states of the U and Th atoms in the fullerenes were deduced to be 3+ and 4+, respectively, from the UV/vis/NIR absorption and XANES spectroscopy.

Journal Articles

Isolation and characterization of light actinide metallofullerenes

Akiyama, Kazuhiko; Zhao, Y.*; Sueki, Keisuke*; Tsukada, Kazuaki; Haba, Hiromitsu; Nagame, Yuichiro; Kodama, Takeshi*; Suzuki, Shinzo*; Otsuki, Tsutomu*; Sakaguchi, Masahiko*; et al.

Journal of the American Chemical Society, 123(1), p.181 - 182, 2001/01

 Times Cited Count:64 Percentile:84.95(Chemistry, Multidisciplinary)

no abstracts in English

Oral presentation

A Complemental use of SANS and SAXS for the analysis of multi-component hierarchical structure

Yamaguchi, Daisuke; Noda, Yohei; Koizumi, Satoshi; Hasegawa, Yoshio*; Hishinuma, Yukio*; Suzuki, Masashi*; Kodama, Hiroto*; Onuma, Masato*; Oba, Yojiro*; Yuasa, Takeshi*; et al.

no journal, , 

Nowadays industrial materials tend to include a variety of additives and to be a composite of them to satisfy a high request for intelligent function and durability. Elucidation of such a multi-component and hierarchical structure is really a tough work but indispensable to learn the fundamentals of relation between the structure and property and to attain a reasonable improvement of those materials. Combined use of small-angle neutron scattering (SANS) and small-angle X-ray scattering (SAXS) often gives a good clue to decompose the total scattering of the organic/inorganic composite into the partial scattering from a particular component. Two examples will be demonstrated here for extracting the structural information from the composite specimen via this method; one is the distribution of the dopant nitrogen atoms in the porous photocatalyst and the other is the dispersion state of fillers in the rubber matrix.

Oral presentation

Measurement and analysis of radiolytically generated hydrogen from HALW, 1; Measurement and evaluation of the hydrogen concentration in the vessel off-gas

Tomiyama, Masahiro; Yasuda, Takeshi; Tsutagi, Koichi; Yoshino, Yasuyuki; Shirato, Yoji; Nakamura, Yoshinobu; Kinuhata, Hiroshi*; Kodama, Takashi*; Nakano, Masanao*; Tamauchi, Yoshikazu*; et al.

no journal, , 

no abstracts in English

Oral presentation

Measurement and analysis of radiolytically generated hydrogen from HALW, 2; Comparison of measured hydrogen concentration and its estimation

Kinuhata, Hiroshi*; Kodama, Takashi*; Nakano, Masanao*; Tamauchi, Yoshikazu*; Matsuoka, Shingo*; Tomiyama, Masahiro; Yasuda, Takeshi; Tsutagi, Koichi; Yoshino, Yasuyuki; Shirato, Yoji; et al.

no journal, , 

no abstracts in English

Oral presentation

2D neutron diffraction imaging on an ammonite

Shamoto, Shinichi; Kodama, Katsuaki; Imaki, Tadashi*; Nakatani, Takeshi; Oshita, Hidetoshi*; Kaneko, Naokatsu*; Masuko, Kenji*; Sakamoto, Kensaku; Yamaguchi, Kenji; Suzuya, Kentaro; et al.

no journal, , 

2D neutron diffraction imaging of an ammonite fossil was carried out at high-intensity total diffractometer NOVA in J-PARC. Observed diffraction profiles consist of calcite, siderite and amorphous structures. Most of part in the ammonite is calcite. The calcite image shows air chambers divided by septa in the spiral shell. Siderite is observed only in the body chamber. Amorphous structure is observed in both the protoconch and the inner whorls.

Oral presentation

Neutron diffraction imaging at NOVA (J-PARC), HRPD, RESA, and TNRF (JRR-3)

Shamoto, Shinichi; Imaki, Tadashi*; Oshita, Hidetoshi*; Nakatani, Takeshi; Kodama, Katsuaki; Kaneko, Naokatsu*; Suzuki, Hiroshi; Iikura, Hiroshi; Moriai, Atsushi; Matsubayashi, Masahito; et al.

no journal, , 

Neutron diffraction imaging for a SUS430 plate embedded in a copper block sample has been tested at the high-intensity total diffractometer NOVA in J-PARC, the High-Resolution Powder Diffractometer HRPD and the diffractometer for Residual Stress Analysis RESA in JRR-3. The results are also compared with that measured at the Thermal Neutron Radiography Facility TNRF in JRR-3.

Oral presentation

Average and local structures of BaSn$$_{0.5}$$In$$_{0.5}$$O$$_{2.75}$$ as electrolyte for solid oxide fuel cell analyzed by neutron diffraction

Igawa, Naoki; Kodama, Katsuaki; Taguchi, Tomitsugu*; Yoshida, Yukihiko*; Matsukawa, Takeshi*; Hoshikawa, Akinori*; Ishigaki, Toru*

no journal, , 

The average and local structures of BaSn$$_{0.5}$$In$$_{0.5}$$O$$_{2.75}$$ which is one of the excellent solid electrolytes for solid oxide fuel cells were analyzed by using the Rietveld method and the Atomic Pair Distribution Function (PDF) analysis method with the neutron diffraction to research the crystal structural effect on the electrical properties. PDF profile which was obtained from the neutron diffraction data of BaSn$$_{0.5}$$In$$_{0.5}$$O$$_{2.75}$$ was fitted by using the crystal structure with the space group, ${it Pm}$-3${it m}$ which corresponds with the average structure, and the fitting relatively good reproduces the observed data. In this work, the relationship between the average and local structures of hydrogen doped and undoped BaSn$$_{0.5}$$In$$_{0.5}$$O$$_{2.75}$$ will be discussed.

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