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The title compound (lanthanum dodecazinc), LaZn 12.37 (1) , is confirmed to be a nonstoichiometric (zinc-deficient) modification of the NaZn 13  structure type, in which one Zn atom (Wyckoff site 8 b , site symmetry  m) has a fractional site occupancy of 0.372 (11). The other Zn atom (96 i ,  m ) and the La atom (8 a , 432) are fully occupied. The coordination polyhedra of the Zn atoms are distorted icosa­hedra, whereas the La atoms are surrounded by 24 Zn atoms, forming pseudo-Frank–Kasper polyhedra. Electronic structure calculations indicate that Zn—Zn bonding is much stronger than La—Zn bonding.

LaZn12.37 (1), a zinc-deficient variant of the NaZn13structure type

LaZn_{12.37 (1)}, a zinc-deficient variant of the NaZn₁₃structure type