Abstract
Powder neutron diffraction studies have been performed for the compounds α-LaNi 5D x ( x = 0.1 and 0.4). In the P6/ mmm space group of the intermetallic LaNi 5, in the case of the “virgin” sample the deuterium atoms are found in the basal plane for the two compounds with strains localized in this plane but the deuterium atoms are displayed in all crystallographic directions for the “activated” sample. A geometrical model applied to these compounds revealed that in the basal plane only the 12n site can be occupied. Our structural determination did not exclude the occupancy of a second site but gave a lower occupancy than the 12n site.
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