Abstract
The crystal structure of the compound LaFe 10.9Al 2.1 and its ternary nitride have been studied by time-of-flight neutron diffraction at room temperature. It has been confirmed that LaFe 10.9Al 2.1 crystallises in the cubic NaZn 13 type structure. The 8b site in this crystal structure is exclusively occupied by Fe atoms while the 96i site is occupied by Fe and Al atoms. Charging with nitrogen gas results in an increase of the lattice constant from a=11.6281(1) Å to a=11.9532(2) Å, corresponding to an increase in unit cell volume of 8.64%. The N atoms in the nitride occupy exclusively the 24d interstitial hole site. The influence of nitrogen uptake on the type of magnetic ordering is discussed.
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