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High-pressure-high-temperature study of benzene; Refined crystal structure and new phase diagram up to 8 GPa and 923 K

Chanyshev, A. D.*; Litasov, K. D.*; Rashchenko, S.*; 佐野 亜沙美; 鍵 裕之*; 服部 高典; Shatskiy, A. F.*; Dymshits, A. M.*; Sharygin, I. S.*; 肥後 祐司*

Crystal Growth & Design, 18(5), p.3016 - 3026, 2018/05

 被引用回数:8 パーセンタイル:16.1(Chemistry, Multidisciplinary)



Hydrogenation of $$L$$1$$_{2}$$-type AlNi$$_{3}$$ alloy at high pressure and temperature

遠藤 成輝*; 齋藤 寛之; 町田 晃彦; 片山 芳則

Journal of Alloys and Compounds, 645(Suppl.1), p.S61 - S63, 2015/10

 被引用回数:0 パーセンタイル:100(Chemistry, Physical)

We investigated the hydrogenation of the $$L$$1$$_{2}$$-type AlNi$$_{3}$$ alloy at 3 GPa and 500$$^{circ}$$C using in situ synchrotron radiation X-ray diffraction measurements. An isotropic lattice expansion was observed to have occurred owing to the hydrogenation, and a novel hydride (AlNi$$_{3}$$H$$_{x}$$) was formed. Because of such isotropic lattice expansion, the hydrogen-occupied sites were the body-center sites of the $$L$$1$$_{2}$$ structure (P$$m$$-3$$m$$). In this case, the hydrogen content was calculated to be $$x$$ = 1.0, which is consistent with the experimental results. The AlNi$$_{3}$$H$$_{x}$$ hydride was stable under ambient conditions.


Hydrogenation of a TiFe-based alloy at high pressures and temperatures

遠藤 成輝*; 斉田 愛子*; 中村 優美子*; 齋藤 寛之; 町田 晃彦

International Journal of Hydrogen Energy, 40(8), p.3283 - 3287, 2015/03

 被引用回数:10 パーセンタイル:63.58(Chemistry, Physical)

We investigated the hydrogenation of a ternary TiFe$$_{0.8}$$Mn$$_{0.2}$$ alloy under high pressure (up to 6.5 GPa) and at high temperature (up to 600 $$^{circ}$$C) by in situ synchrotron radiation X-ray diffraction measurements. A chemical order-disorder phase transition and the formation of body-centered cubic (BCC) hydride were observed. The phase-transition temperature was 400 $$^{circ}$$C, which is 200 $$^{circ}$$C lower than that of a binary TiFe alloy. A disproportionation reaction, which was observed for the binary TiFe alloy, did not occur at this temperature. The BCC hydride existed stably, and new hydrides were not formed after the BCC hydride became a single phase. Since the unit cell volume of the BCC hydride was almost equal to that of the hydride, TiFe$$_{0.8}$$Mn$$_{0.2}$$H$$_{1.8}$$, under the same pressure-temperature conditions, the hydrogen content of the former was roughly estimated as the same as that of the latter (hydrogen to metal atom ratio = 0.9).


Phase diagram of the Eu-H system at high temperatures and high hydrogen pressures

齋藤 寛之; 町田 晃彦; 松岡 岳洋*; 青木 勝敏*

Solid State Communications, 205, p.24 - 27, 2015/03

 被引用回数:4 パーセンタイル:73.73(Physics, Condensed Matter)

The phase boundary between the hydrogen rich phases EuH$$_{it{x}}$$-III and EuH$$_{it{x}}$$-IV is determined by X-ray diffraction and infrared absorption measurements. Phase IV is characterized as a high temperature phase of phase III over an investigated pressure range of 4 - 10 GPa. The transition temperature exhibits a maximum value of 550 K at 7 GPa, where the slope of the boundary switches from positive to negative.


Li$$_{4}$$FeH$$_{6}$$; Iron-containing complex hydride with high gravimetric hydrogen density

齋藤 寛之; 高木 成幸*; 松尾 元彰*; 飯島 祐樹*; 遠藤 成輝*; 青木 勝敏*; 折茂 慎一*

APL Materials (Internet), 2(7), p.076103_1 - 076103_7, 2014/07

 被引用回数:15 パーセンタイル:35.4(Nanoscience & Nanotechnology)

Li$$_{4}$$FeH$$_{6}$$, which has the highest gravimetric hydrogen density of iron-containing complex hydrides reported so far, is synthesized by hydrogenation of a powder mixture of iron and LiH above 6.1 GPa at 900 $$^{circ}$$C. ${it In situ}$ synchrotron radiation X-ray diffraction measurements reveal that while kinetics require high temperature and thus high pressure for the synthesis, Li$$_{4}$$FeH$$_{6}$$ is expected to be thermodynamically stable slightly below room temperature at ambient pressure; further synthetic studies to suppress the kinetic effects may enable us to synthesize Li$$_{4}$$FeH$$_{6}$$ at moderate pressures. Li$$_{4}$$FeH$$_{6}$$ can be recovered at ambient conditions where Li$$_{4}$$FeH$$_{6}$$ is metastable.


Single crystal growth of gallium nitride by slow-cooling of its congruent melt under high pressure

齋藤 寛之; 内海 渉; 金子 洋*; 桐山 幸治*; 青木 勝敏

State-of-the-Art Program on Compound Semiconductors XLI and Nitride and Wide Bandgap Semiconductors for Sensors, Photonics, and Electronics V, p.587 - 592, 2004/10



Synthesis of Al$$_{x}$$Ga$$_{1-x}$$N alloy by solid-phase reaction under high pressure

齋藤 寛之; 内海 渉; 金子 洋*; 青木 勝敏

Japanese Journal of Applied Physics, Part 2, 43(7B), p.L981 - L983, 2004/07

 被引用回数:4 パーセンタイル:78.82(Physics, Applied)

バルクのAl$$_{x}$$Ga$$_{1-x}$$N半導体合金をすべての組成領域にわたり高温高圧下で固相反応によって合成した。その場X線回折実験により6GPa, 800$$^{circ}$$Cの条件で合金化が開始することを観察した。回収試料のSEM観察及び粉末X線回折実験から、Ga原子とAl原子の均一な分布と、組成に対する格子定数の連続的な変化を確認したが、これはAlNとGaNの固溶体が任意組成で形成されていることを示している。


In situ X-ray observations of the decomposition of brucite and the graphite-diamond conversion in aqueous fluid at high pressure and temperature

岡田 卓; 内海 渉; 金子 洋*; 山片 正明*; 下村 理

Physics and Chemistry of Minerals, 29(7), p.439 - 445, 2002/08

 被引用回数:13 パーセンタイル:51.22(Materials Science, Multidisciplinary)



高性能燃料被覆管材質の研究; 平成11~12年度(フェーズ1)報告書(共同研究)

木内 清; 井岡 郁夫; 橘 勝美; 鈴木 富男; 深谷 清*; 猪原 康人*; 神原 正三; 黒田 雄二*; 宮本 智司*; 小倉 一知*

JAERI-Research 2002-008, 63 Pages, 2002/03




Corrosion of aluminum in high pressure steam at temperatures above and below 320$$^{circ}$$C

近藤 達男; 圷 長; 川崎 正之

Trans.Jpn.Inst.Met., 3(2), p.110 - 118, 1962/00



Aluminum-based interstitial hydride, Al$$_{2}$$CuH$$_{x}$$

齋藤 寛之; 高木 成幸*; 遠藤 成輝*; 町田 晃彦; 青木 勝敏; 折茂 慎一*; 片山 芳則

no journal, , 

Aluminum-based interstitial hydride has not been reported so far, whereas complex aluminum hydrides have been synthesized and investigated. In the present study, we demonstrate the formation of Al$$_{2}$$CuH$$_{x}$$ interstitial hydride by a hydrogenation reaction of Al$$_{2}$$Cu alloy under high pressure and high temperature.

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