TY - JOUR
T1 - Hydriding properties and crystal structure of NaCl-type mono-hydrides formed from Ti-V-Mn BCC solid solutions
AU - Nakamura, Yumiko
AU - Akiba, Etsuo
PY - 2002/10/28
Y1 - 2002/10/28
N2 - Hydriding properties and crystal structure of NaCl-type mono-hydrides of TixVyMn3.0-x-y (0.8≤x≤1.2, 1.0≤y≤1.3) BCC solid solutions were investigated. This system had two plateaus in the P-C isotherm between 0.001 and 5.0 MPa at 353 K. They correspond to two-phase regions: a solid solution and mono-hydride region; and a mono-hydride and di-hydride region. Absorption and desorption pressures of both plateaus changed almost linearly with the unit cell volume of the as-cast alloys. The slopes of the linear relations for the first plateau (solid solution-mono-hydride) were similar to those reported for AB5 compounds, while the slopes for the second plateau (mono-hydride-di-hydride) were several times larger than those for the first plateau. The NaCl-type mono-hydrides studied had either a pseudo-cubic FCC or an FCC structure with an axial ratio (c′/a′)=0.91-1.0. The ratio (c′/a′) depended on alloy composition. Mn-rich samples formed mono-hydrides with a cubic structure ((c′/a′)=1.0) and increasing Ti fraction decreased (c′/a′).
AB - Hydriding properties and crystal structure of NaCl-type mono-hydrides of TixVyMn3.0-x-y (0.8≤x≤1.2, 1.0≤y≤1.3) BCC solid solutions were investigated. This system had two plateaus in the P-C isotherm between 0.001 and 5.0 MPa at 353 K. They correspond to two-phase regions: a solid solution and mono-hydride region; and a mono-hydride and di-hydride region. Absorption and desorption pressures of both plateaus changed almost linearly with the unit cell volume of the as-cast alloys. The slopes of the linear relations for the first plateau (solid solution-mono-hydride) were similar to those reported for AB5 compounds, while the slopes for the second plateau (mono-hydride-di-hydride) were several times larger than those for the first plateau. The NaCl-type mono-hydrides studied had either a pseudo-cubic FCC or an FCC structure with an axial ratio (c′/a′)=0.91-1.0. The ratio (c′/a′) depended on alloy composition. Mn-rich samples formed mono-hydrides with a cubic structure ((c′/a′)=1.0) and increasing Ti fraction decreased (c′/a′).
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U2 - 10.1016/S0925-8388(02)00434-6
DO - 10.1016/S0925-8388(02)00434-6
M3 - Article
AN - SCOPUS:0037190932
SN - 0925-8388
VL - 345
SP - 175
EP - 182
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
IS - 1-2
ER -