Abstract
High resolution time-of-flight neutron powder diffraction has been performed on the intermetallic compound YNi 10Si 2 of the ThMn 12 (space group I 4/ mmm) tetragonal structure at room temperature. Rietveld profile refinement of the powder pattern gave detailed structural parameters. The Si atoms are found to preferentially occupy the 8⨍ site with some small occupancies also for both the 8 i and 8 j sites. A minority impurity phase has been identified as that of the cubic NaZn 13-type structure (space group Fm 3c) . This present neutron diffraction investigation of metalloid substitution on the three transition metal sublattices in this structure type, as well as previous neutron studies, confirm that both atomic size and enthalpy effects are important in determination of preferential site ordering.
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