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Single crystals of Ln4[Al 12 O 24 ](Pb 4 O 4 ) 2  (Ln = Nd, Sm) have been prepared by flux techniques. The compounds crystallize with cubic symmetry, space group Oh-Pn3̄m, a Nd  = 9.514(1), a Sm  = 9.481(1) Å, Z = 1. The crystal structure is characterized by a [Al 12 O 24 ] 12-  framework. Four of the eight six-membered rings of AlO 4 -tetrahedra per sodalite cage are centered by Ln 3+  ions. The cages of the resulting electrically neutral network are filled with [Pb 4 O 4 ] ±0  heterocubane units. Oxygen of the heterocubane units completes the coordination spheres of the rare earth ions to hexagonal bipyramids.

zeitschrift für naturforschung b

Elektroneutrale Pb 4 O 4  -Heterokubaneinheiten in den Aluminatsodalithen Ln 4 [Al 12 O 24 ](Pb 4 O 4 ) 2  (Ln = Nd, Sm) / Electrically Neutral Pb 4 O 4  Heterocubane Units in Aluminate Sodalites Ln 4 [Al 12 O 24 ](Pb 4 O 4 ) 2  (Ln = Nd, Sm)