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論文

Transmission properties of a 4-MeV C$$^+$$ ion beam entering a narrow gap between two cylindrical glass surfaces

本橋 健次*; 齋藤 勇一; 宮脇 信正; 松尾 祐太郎*

Japanese Journal of Applied Physics, 52(7), p.076301_1 - 076301_6, 2013/07

 被引用回数:4 パーセンタイル:18.44(Physics, Applied)

The transmission properties of a 4-MeV C$$^+$$ ion beam entering a narrow gap between a pair of convex and concave glass rods facing each other are investigated in order to inspect the possibility to guide the ion beam with the tilting curved gap. The curvature of both rods was R = 155.70 mm, the gap was 1.2 mm. The entire setup can be tilted around the z-axis passing through the center of the gap at the entrance side. The tilt angle $$theta$$ was defined positive for clockwise rotation. The ion transmission of 42-59% obtained at a tilt angle $$theta$$ = 3$$^{circ}$$ was 20-30 times larger than the value of 2% estimated from the cross section of the narrow gap. About 10% of the ions transmitted even at $$theta$$ = 3.4$$^{circ}$$ in which almost no ions can pass through the gap without interacting with the cylindrical glass surfaces, according to the results of laser-transmission experiment. No significant loss in their initial energies was observed in the angular range of -3 $$leq$$ $$theta$$ $$leq$$ +3.4$$^{circ}$$. These results show an evidence of a guide effect of the carved gap to swift heavy ion beams.

論文

Formation process of perovskite-type hydride LiNiH$$_{3}$$; ${it In situ}$ synchrotron radiation X-ray diffraction study

佐藤 龍太郎*; 齋藤 寛之; 遠藤 成輝; 高木 成幸*; 松尾 元彰*; 青木 勝敏; 折茂 慎一*

Applied Physics Letters, 102(9), p.091901_1 - 091901_4, 2013/03

 被引用回数:23 パーセンタイル:73.58(Physics, Applied)

The formation process of perovskite-type hydride LiNiH$$_{3}$$ was investigated using ${it in situ}$ synchrotron X-ray diffraction measurements. A mixture of LiH and Ni was hydrogenated at 873 K and 3 GPa, and the structural changes associated with hydrogenation were observed. Time resolved diffraction profiles showed a three-step reaction: hydrogenation of Ni to NiH$$_{x}$$, formation of Li$$_{y}$$Ni$$_{1-y}$$H solid solution, and conversion to perovskite-type hydride LiNiH$$_{3}$$. The solid solution, which has never been reported, plays the role of the precursor in the perovskite formation and its presence is apparently critical for synthesizing perovskite-type hydrides.

論文

Density-functional study of perovskite-type hydride LiNiH$$_{3}$$ and its synthesis; Mechanism for formation of metallic perovskite

高木 成幸*; 齋藤 寛之; 遠藤 成輝; 佐藤 龍太郎*; 池庄司 民夫*; 松尾 元彰*; 三輪 和利*; 青木 勝敏; 折茂 慎一*

Physical Review B, 87(12), p.125134_1 - 125134_6, 2013/03

 被引用回数:12 パーセンタイル:53.67(Materials Science, Multidisciplinary)

A metallic perovskite-type hydride LiNiH$$_{3}$$ was synthesized based on first-principles prediction. We theoretically examined its electronic structure and found that half of the Ni-H derived antibonding states are occupied and that the modest thermodynamic stability depends on a delicate balance between (1) destabilization and (2) alleviation of compression frustration in corner-sharing octahedra, both of which arise from occupation of antibonding states. Through density-functional analyses of the electronic structure and lattice instability extending over Li$$T$$H$$_{3}$$ series ($$T$$ = Fe, Co, Ni, and Cu), we showed that the balance is in fact reflected in their thermodynamic stability.

論文

Formation of an Fe-H complex anion in YFe$$_{2}$$; Adjustment of imbalanced charge by additional Li as an electron donor

松尾 元彰*; 齋藤 寛之; 町田 晃彦; 佐藤 龍太郎*; 高木 成幸*; 三輪 和利*; 綿貫 徹; 片山 芳則; 青木 勝敏; 折茂 慎一*

RSC Advances (Internet), 3(4), p.1013 - 1016, 2013/01

 被引用回数:16 パーセンタイル:52.39(Chemistry, Multidisciplinary)

The novel complex hydride YLiFeH$$_{6}$$ with the Fe-H complex anion ([FeH$$_{6}$$]$$^{4-}$$) was synthesized by hydrogenation of YFe$$_{2}$$ together with additional Li. Li adjusts the original imbalanced charge between Y$$^{3+}$$ and [FeH$$_{6}$$]$$^{4-}$$ by donating an electron to convert into Li$$^{+}$$ during the hydrogenation, resulting in the formation of the well charge-balanced state of Y$$^{3+}$$Li$$^{+}$$[FeH$$_{6}$$]$$^{4-}$$.

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