Abstract
The effects of the annealing and partial substitution of Y for La on the structural and electrochemical properties of La 1-xY xNi 3.55Mn o.4Al o.3Cr o.75 ( x = 0, 0.1 and 0.2) alloys were reported in the present work. The single-phased CaCu 5-type structure was retained after La was partially substituted by Y. However, the increase of Y content leads to decrease of the lattice parameters and the unit-cell volume. The annealed La o.9Y o.1Ni 3.55Mn o.4Al o.3Co o.75 alloys shows typical isometric microstructure, indicating that the composition segregation is improved by annealing. Y substitution for La in the alloys is effective to improve the electrochemical properties at both room temperature and high temperature. A critical substitution content of Y is found at x = 0.1.
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