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New alloys of LaMgNi (Ni/(La+Mg)=3~4) system absorb and desorb hydrogen at room temperature, and the hydrogen capacity is higher than conventional AB5type alloys. The crystal structures of La0.7Mg0.3Ni2.5Co0.5 (alloy T1) and La0.75Mg0.25 Ni3.0Co0.5 (alloy T2) were investigated using ICP, SEMEDX and XRD. We found that the alloy T1 consisted of Ce2Ni7type La3Mg(Ni, Co)14 and PuNi3type La2Mg(Ni, Co)9 phases and that the alloy T2 consisted of Ce2Ni7type La3Mg(Ni, Co)14 and Pr5 Co19type La4Mg(Ni, Co)19 phases. These alloys system has layered structure and shows polytypism that is originated from difference in stacking of some [CaCu5]type layers and one [MgZn2]type layer along caxis. Crystal structure of La3Mg(Ni, Co)14 is hexagonal 2HCe2Ni7type, a=0.5052(1) nm, c=2.4245(3) nm. La2Mg(Ni, Co)9 is trigonal 3RPuNi3type, a=0.5062 (1) nm, c=2.4500(2) nm. La4Mg(Ni, Co)19 is 2HPr5Co19type, a=0.5042(2) nm, c=3.2232(5) nm. In these all structure, La La distance in the [CaCu5] layer was 0.38~0.40 nm but that in the [MgZn2] layer was 0.32 nm. It was also found that Mg occupied the La site in the [MgZn2] layer. Selective occupation of Mg at the La site in the [MgZn2] layer makes the alloy stable in repeated reaction cycles with hydrogen. This alloy system has formed an agent group is described by the general formula Lan+1MgNi5n+4 where n=0, 1, 2, 3, 4

Crystal Structure of Hydrogen Storage Alloys, La-Mg-Nix (x=3-4) System