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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:19 パーセンタイル:68.34(Nanoscience & Nanotechnology)LiFeH
, 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
C.
synchrotron radiation X-ray diffraction measurements reveal that while kinetics require high temperature and thus high pressure for the synthesis, Li
FeH
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
FeH
at moderate pressures. Li
FeH
can be recovered at ambient conditions where Li
FeH
is metastable.
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
被引用回数:12 パーセンタイル:51.84(Nanoscience & Nanotechnology)Aluminum-based alloy hydride AlCuH
(x
1) is synthesized by hydrogenating Al
Cu alloy using high-temperature and high-pressure hydrogen atmosphere. Al
Cu square antiprisms in Al
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
CuH
. Thermodynamic stability of Al
CuH
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
CuH
illustrate the formation of an interstitial hydride of aluminum-based alloy.