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論文

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

https://doi.org/10.1063/1.4886219
 被引用回数：19 パーセンタイル：68.34(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.

論文

Synthesis and formation process of Al$$_{2}$$CuH$$_{x}$$; A New class of interstitial aluminum-based alloy hydride

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

APL Materials (Internet), 1(3), p.032113_1 - 032113_7, 2013/09

https://doi.org/10.1063/1.4821632
 被引用回数：12 パーセンタイル：51.84(Nanoscience & Nanotechnology)

Aluminum-based alloy hydride Al$$_{2}$$CuH$$_{x}$$ (x$$sim$$1) is synthesized by hydrogenating Al$$_{2}$$Cu alloy using high-temperature and high-pressure hydrogen atmosphere. Al$$_{8}$$Cu square antiprisms in Al$$_{2}$$Cu twist around the c axis of a tetragonal unit cell by hydrogenation. The twist enlarges the interstitial spaces for accommodating hydrogen atoms which align linearly parallel to the c axis in Al$$_{2}$$CuH$$_{x}$$. Thermodynamic stability of Al$$_{2}$$CuH$$_{x}$$ results from the balance of stabilization by H 1s and Al 3sp hybridization and destabilization owing to the Fermi-level lifting upon hydrogenation. The crystal and electronic structures of Al$$_{2}$$CuH$$_{x}$$ illustrate the formation of an interstitial hydride of aluminum-based alloy.

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