title: Structural and electrochemical properties of annealed La1-xYxNi3.55Mno.4Alo.3Coo.75 hydrogen storage alloys.
abstract: The effects of the annealing and partial substitution of Y for La on the structural and electrochemical properties of La1-xYxNi3.55Mno.4Alo.3Cro.75 (x = 0, 0.1 and 0.2) alloys were reported in the present work. The single-phased CaCu5-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 Lao.9Yo.1Ni3.55Mno.4Alo.3Coo.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.
authors.affiliation: Engineering Research Center of Materials Behavior and Design, Ministry of Education of China, and School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
authors.forename: Yulei
authors.initials: Y
authors.lastname: Du
authors.forename: Wei
authors.initials: W
authors.lastname: Li
mesh_terms: D000497:Alloys / Q000737:chemistry*; D004563:Electrochemistry / Q000379:methods*; D006859:Hydrogen / Q000737:chemistry*; D013696:Temperature; D014961:X-Ray Diffraction
chemical_list: D000497:Alloys; D006859:Hydrogen