Substitution effect of rare earth on hydrogenation for AB5-type alloys

被引：9

作者：

Endo, Daisuke ^{[1
]}

Akiba, Etsuo

机构：

[1] GSYUASA Corp, Kyoto 6018520, Japan

[2] AIST, Tsukuba, Ibaraki 3058565, Japan

来源：

MATERIALS TRANSACTIONS | 2006年 / 47卷 / 08期

关键词：

hydrogen storage alloy; rare earth; nickel-MH battery; lattice volume expansion; lattice strain;

D O I：

10.2320/matertrans.47.1914

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Substitution effects of rare earth elements for hydrogenation of MmNi(3.55)Co(0.75)Al(0.30)Mn(0.40) AB(5)-type alloys were investigated, where Mm consisted of La-Pr-Nd-M (M: Cc, Y, Gd, Tm and Lu), and the amount of La and M was adjusted to keep the lattice volume identical which leads to a similar equilibrium hydrogen pressure. The above alloys showed two-phase reaction during hydrogenation, and both the phases had the orthorhombic lattice with a space group of Cmmm after activation. The Ce containing alloy showed a higher equilibrium hydrogen pressure (0.12 MPa) than the others (0.07-0.10 MPa) at 298 K. In addition, this alloy showed the largest lattice volume expansion among the alloys investigated. However, lattice strain of the hydride phases calculated from line broadening in X-ray diffraction peaks showed to be less than 0.9% for all the alloys investigated.

引用

页码：1914 / 1917

页数：4

共 7 条

[1] Nano scale structure such as nano-size crystallites and defects can be found in conventional hydrogen absorbing alloys [J].