Effects of Y Substitution for La on the Microstructure and Electrochemical Properties of LaNi_3.55Mn_0.4Al_0.3Co_0.75 Hydrogen Storage Alloys

抄録

The effects of the partial substitution of Y for La in La_1−xY_xNi_3.55Mn_0.4Al_0.3Co_0.75 (x=0, 0.1 and 0.2) alloys were reported in this paper. The single-phase CaCu₅-type structure is retained after La is partially substituted by Y. However, the increase of Y content leads to decrease of the lattice parameters and unit-cell volume. Y substitution for La in the alloys is effective to improve the electrochemical properties at room temperature and high temperature. A critical substitution content of Y is found at x=0.1.