2008 Volume 49 Issue 10 Pages 2229-2232
The effects of the partial substitution of Y for La in La1−xYxNi3.55Mn0.4Al0.3Co0.75 (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.