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Reactions of BaCO 3 , ZnO, Lu 2 O 3  and Al 2 O 3  mixtures at temperatures up to 1500 °C led to small and colourless rods of BaLuAlZn 3 O 7 . The new compound crystallizes with hexagonal symmetry, space group C 6v  4  -P6 3 mc, a = 6.273, c =10.161 Å, Z = 2. In spite of small differences in the oxygen content BaLuAlZn 3 O 7  is isotypic to Ba 2 Ln 2 Zn 8 O 13 . The crystal structure shows Zn 2+  with tetrahedral, Lu 3+  with octahedral and Ba 2+  with anticuboctahedral coordination by O 2- . It has been shown that parts of the [Zn 3 AlO 7 ] 5-  network are fragments of the ZnO structure. In consequence one oxygen atom is fourfold coordinated by zinc/aluminium. The space group of Ba 2 Ln 2 Zn 8 O 13  must be corrected to C 6v  4  -P6 3 mc.

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Zur Kenntnis eines Barium-Lanthanoid-Aluminat-Zinkats: BaLuAlZn 3 O 7  mit einem Anhang zu Ba 2 Er 2 Zn 8 O 13 /On a Barium Rare Earth Aluminate Zincate: BaLuAlZn 3 O 7  with a Note on Ba 2 Er 2 Zn 8 O 13