Abstract
Hydrogen absorption (HA) capacity of Sm(CobalFe x Cu0.053Zr0.02)7.84 ( $x=0.2$ , 0.3, 0.4, 0.5) as-cast alloys was improved through increasing Fe content and its mechanism was symmetrically analyzed. X-ray diffraction analysis indicates that the main phase of all as-cast alloys was 1:7 phase. Due to lower electronegativity of Fe than that of Co, activation energy of chemical adsorption for 1:7 phase was reduced with increasing Fe content. Due to larger atomic radius of Fe than that of Co, lattice parameters and lattice gaps of 1:7 phases were enlarged with increasing Fe content, and diffusion barrier of H atoms was lowered resulting from increasing lattice parameters and sizes of lattice gaps. These all strengthened the HA capacity of 1:7 phase. Two principles are mentioned to provide theoretical guidance for strengthening HA capacity by adding other elements.
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