TY - JOUR
T1 - Hydriding properties of (Mg1-xMx)Ni2 C15-type laves phase alloys
AU - Terashita, Naoyoshi
AU - Akiba, Etsuo
PY - 2006/8/1
Y1 - 2006/8/1
N2 - Mg-based Laves phase alloys (Mg0.7M0.3)Ni 2, where M elements were Ca, La, Ce, Pr, Nd and Gd were successfully developed. The alloys can be synthesized by a conventional induction melting and annealing method from intermetallic compounds MgNi2 and MNi 2 as a source of Mg, Ni and M elements. The crystal structures of the major phases of annealed (Mg0.7M0.3)Ni2 alloys were C15-type for M = Ca and C15b-type for M = La, Ce, Pr, Nd and Gd Laves structures, respectively. In the alloys except M = Ce, hydrogenation and dehydrogenation reversibly occurred. The maximum hydrogen contents of the alloys are 1.2-1.6 mass% (H/M:0.6-0.8) under hydrogen pressure of 5 MPa at 243-273 K. As the results of measurements of p-c isotherms, in the case of the M = Pr and Nd, two step plateaus were clearly observed. After a few hydrogenation/ dehydrogenation cycles, the alloys kept C15-type or C15 b-type Laves structures without hydrogen-induced amorphization. disproportionation and decomposition.
AB - Mg-based Laves phase alloys (Mg0.7M0.3)Ni 2, where M elements were Ca, La, Ce, Pr, Nd and Gd were successfully developed. The alloys can be synthesized by a conventional induction melting and annealing method from intermetallic compounds MgNi2 and MNi 2 as a source of Mg, Ni and M elements. The crystal structures of the major phases of annealed (Mg0.7M0.3)Ni2 alloys were C15-type for M = Ca and C15b-type for M = La, Ce, Pr, Nd and Gd Laves structures, respectively. In the alloys except M = Ce, hydrogenation and dehydrogenation reversibly occurred. The maximum hydrogen contents of the alloys are 1.2-1.6 mass% (H/M:0.6-0.8) under hydrogen pressure of 5 MPa at 243-273 K. As the results of measurements of p-c isotherms, in the case of the M = Pr and Nd, two step plateaus were clearly observed. After a few hydrogenation/ dehydrogenation cycles, the alloys kept C15-type or C15 b-type Laves structures without hydrogen-induced amorphization. disproportionation and decomposition.
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U2 - 10.2320/matertrans.47.1890
DO - 10.2320/matertrans.47.1890
M3 - Article
AN - SCOPUS:33749587057
VL - 47
SP - 1890
EP - 1893
JO - Materials Transactions
JF - Materials Transactions
SN - 0916-1821
IS - 8
ER -