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Journal Articles

Spontaneous formation of suboxidic coordination around Co in ferromagnetic rutile Ti$$_{0.95}$$Co$$_{0.05}$$O$$_2$$ film

Hu, W.*; Hayashi, Koichi*; Fukumura, Tomoteru*; Akagi, Kazuto*; Tsukada, Masaru*; Happo, Naohisa*; Hosokawa, Shinya*; Owada, Kenji; Takahashi, Masamitsu; Suzuki, Motohiro*; et al.

Applied Physics Letters, 106(22), p.222403_1 - 222403_5, 2015/06

 Times Cited Count:33 Percentile:82.92(Physics, Applied)

Journal Articles

Chloride complexation of Zr and Hf in HCl investigated by extended X-ray absorption fine structure spectroscopy; Toward characterization of chloride complexation of element 104, rutherfordium (Rf)

Haba, Hiromitsu*; Akiyama, Kazuhiko*; Tsukada, Kazuaki; Asai, Masato; Toyoshima, Atsushi; Yaita, Tsuyoshi; Hirata, Masaru; Sueki, Keisuke*; Nagame, Yuichiro

Bulletin of the Chemical Society of Japan, 82(6), p.698 - 703, 2009/06

 Times Cited Count:10 Percentile:41.76(Chemistry, Multidisciplinary)

Chloride complexation of the group-4 elements Zr and Hf in 8.0-11.9 M HCl is investigated by Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy to characterize chloro complexes of the transactinide element, rutherfordium (Rf). The complexes of Zr and Hf successively vary with the concentration of HCl from a hydrated complex [M(H$$_{2}$$O) $$_{8}$$]$$^{4+}$$ at 8.0 M to a hexachloro complex [MCl$$_{6}$$]$$^{2-}$$ at 11.9 M (M = Zr and Hf). The present structural changes of the Zr and Hf complexes well reflect the previously studied anion-exchange behavior of Zr and Hf in HCl. From both the EXAFS and anion-exchange results, we suggest that Rf forms the same complexes as those of Zr and Hf in HCl, and that the complexation strength of the hexachloro complexes of the group-4 elements, [MCl$$_{6}$$] $$^{2-}$$ (M = Zr, Hf, and Rf), is in the sequence of Rf $$>$$ Zr $$>$$ Hf.

Journal Articles

Preparation of highly stable ion exchange membranes by radiation-induced graft copolymerization of styrene and Bis(vinyl phenyl)ethane into crosslinked polytetrafluoroethylene films

Yamaki, Tetsuya; Tsukada, Junichi; Asano, Masaharu; Katakai, Ryoichi*; Yoshida, Masaru

Journal of Fuel Cell Science and Technology, 4(1), p.56 - 64, 2007/02

 Times Cited Count:21 Percentile:48.54(Electrochemistry)

PEFC applications will require that the ion exchange membranes have a high ion exchange capacity and reasonable chemical stability. We prepared novel ion exchange membranes by the radiation-induced graft copolymerization of styrene and bis(vinyl phenyl)ethane (BVPE) into crosslinked polytetrafluoroethylene (cPTFE) films and subsequent sulfonation and then investigated their stability in an oxidizing environment and water uptake. In contrast to divinylbenzene (DVB), the degree of grafting of styrene/BVPE increased in spite of high crosslinker concentrations in the reacting solution (up to 70 mol%). Complete sulfonation of the crosslinked graft chains resulted in the preparation of the membranes with a large ion exchange capacity reaching 2.5 meq/g, which exceeded the performance of Nafion. The BVPE-crosslinked membranes exhibited higher durability in a 3% aqueous solution of H$$_{2}$$O$$_{2}$$ at 60 $$^{circ}$$C and decreased water uptake compared to the non-crosslinked one. These undoubtedly mean a profound effect of BVPE on PEFC performances of the membranes.

Journal Articles

Chemical studies on rutherfordium (Rf) at JAERI

Nagame, Yuichiro; Tsukada, Kazuaki; Asai, Masato; Toyoshima, Atsushi; Akiyama, Kazuhiko; Ishii, Yasuo; Sato, Tetsuya; Hirata, Masaru; Nishinaka, Ichiro; Ichikawa, Shinichi; et al.

Radiochimica Acta, 93(9-10), p.519 - 526, 2005/00

 Times Cited Count:29 Percentile:88.24(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Fluoride complexation of element 104, rutherfordium

Haba, Hiromitsu*; Tsukada, Kazuaki; Asai, Masato; Toyoshima, Atsushi; Akiyama, Kazuhiko; Nishinaka, Ichiro; Hirata, Masaru; Yaita, Tsuyoshi; Ichikawa, Shinichi; Nagame, Yuichiro; et al.

Journal of the American Chemical Society, 126(16), p.5219 - 5224, 2004/04

 Times Cited Count:42 Percentile:73.39(Chemistry, Multidisciplinary)

Fluoride complexation of element 104, rutherfordium (Rf), produced in the $$^{248}$$Cm($$^{18}$$O,5n)$$^{261}$$Rf reaction has been studied by anion-exchange chromatography on an atom-at-a-time scale. The anion-exchangechromatographic behavior of Rf was investigated in 1.9-13.9 M hydrofluoric acid together with those of the group-4 elements Zr and Hf produced in the $$^{18}$$O-induced reactions on Ge and Gd targets, respectively. It was found that the adsorption behavior of Rf on anion-exchange resin is quite different from those of Zr and Hf, suggesting the influence of relativistic effect on the fluoride complexation of Rf.

Journal Articles

Chemical studies of the heaviest elements

Nagame, Yuichiro; Haba, Hiromitsu*; Tsukada, Kazuaki; Asai, Masato; Toyoshima, Atsushi; Goto, Shinichi*; Akiyama, Kazuhiko; Kaneko, Tetsuya; Sakama, Minoru*; Hirata, Masaru; et al.

Nuclear Physics A, 734, p.124 - 135, 2004/04

 Times Cited Count:11 Percentile:58.28(Physics, Nuclear)

no abstracts in English

Journal Articles

Transactinide nuclear chemistry at JAERI

Nagame, Yuichiro; Haba, Hiromitsu; Tsukada, Kazuaki; Asai, Masato; Akiyama, Kazuhiko; Hirata, Masaru; Nishinaka, Ichiro; Ichikawa, Shinichi; Nakahara, Hiromichi; Goto, Shinichi*; et al.

Czechoslovak Journal of Physics, 53, p.A299 - A304, 2003/00

 Times Cited Count:7 Percentile:47.65(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Anion-exchange behavior of Rf in HCl and HNO$$_{3}$$ solutions

Haba, Hiromitsu; Tsukada, Kazuaki; Asai, Masato; Goto, Shinichi*; Toyoshima, Atsushi; Nishinaka, Ichiro; Akiyama, Kazuhiko; Hirata, Masaru; Ichikawa, Shinichi; Nagame, Yuichiro; et al.

Journal of Nuclear and Radiochemical Sciences, 3(1), p.143 - 146, 2002/06

We have investigated the sorption behavior of element 104 rutherfordium (Rf) on an anion exchange resin from HCl and HNO$$_{3}$$ solutions. In the HCl experiments, the distribution coefficients of Rf increase with an increase of HCl concentration from 7.0 M to 11.5 M, indicating that anionic species such as [Rf(OH)Cl$$_{5}$$]$$^{2-}$$ or [RfCl$$_{6}$$]$$^{2-}$$ are formed. This sorption behavior of Rf is typical of the group-4 elements Zr and Hf, and is quite different from that of the pseudo-homologue Th. It is also noted that the distribution coefficients decrease in the order Rf, Zr, Hf at 9.0 M HCl, which is consistent with the expected order of ionic radii. On the other hand, Rf appears to behave like Zr and Hf in 8 M HNO$$_{3}$$ not like Pu and Th.

Journal Articles

Startup of transactinide chemistry in JAERI

Haba, Hiromitsu; Tsukada, Kazuaki; Asai, Masato; Nishinaka, Ichiro; Sakama, Minoru*; Goto, Shinichi*; Hirata, Masaru; Ichikawa, Shinichi; Nagame, Yuichiro; Kaneko, Tetsuya*; et al.

Radiochimica Acta, 89(11-12), p.733 - 736, 2002/02

 Times Cited Count:14 Percentile:70.96(Chemistry, Inorganic & Nuclear)

no abstracts in English

JAEA Reports

Design of water feeding system for IASCC irradiation tests at JMTR

Kanno, Masaru; Nabeya, Hideaki; Mori, Yuichiro*; Matsui, Yoshinori; Tobita, Masahiro*; Ide, Hiroshi; Itabashi, Yukio; Komori, Yoshihiro; Tsukada, Takashi; Tsuji, Hirokazu

JAERI-Tech 2001-080, 57 Pages, 2001/12

JAERI-Tech-2001-080.pdf:2.34MB

no abstracts in English

Oral presentation

Formation of anionic chloride complex of Rutherfordium (Rf)

Tsukada, Kazuaki; Toyoshima, Atsushi; Haba, Hiromitsu*; Asai, Masato; Akiyama, Kazuhiko*; Ishii, Yasuo; Tome, Hayato*; Nishinaka, Ichiro; Sato, Tetsuya; Ichikawa, Takatoshi; et al.

no journal, , 

no abstracts in English

Oral presentation

Preparation of highly durable polyelectrolyte membranes based on Bis(vinyl phenyl)ethane-crosslinked graft polymers

Yamaki, Tetsuya; Tsukada, Junichi; Asano, Masaharu; Katakai, Ryoichi*; Yoshida, Masaru

no journal, , 

no abstracts in English

Oral presentation

Aqueous chemistry of the transactinide element, Rutherfordium (Rf)

Nagame, Yuichiro; Asai, Masato; Haba, Hiromitsu*; Hirata, Masaru; Ishii, Yasuo; Nishinaka, Ichiro; Toyoshima, Atsushi; Tsukada, Kazuaki

no journal, , 

no abstracts in English

13 (Records 1-13 displayed on this page)
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