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Single crystals of the two alkali metal zinc oxidotellurates(IV), Rb 2 Zn(TeO 3 )(CO 3 )·H 2 O and Na 2 Zn 2 Te 4 O 11 , were obtained by reactions of mixtures of ZnO, TeO 2 , Rb 2 CO 3  (molar ratios 2:3:6) and ZnO, TeO 2 , Na 2 CO 3  (molar ratios 2:3:10), respectively, with small amounts of water as a mineralizer. Both compounds crystallize as order-disorder (OD) structures of layers and feature a high stacking fault probability. The crystal structure of Rb 2 Zn(TeO 3 )(CO 3 )·H 2 O is composed of layers extending parallel to (100). The structure is composed of two kinds of non-polar OD layers consisting of trigonal-pyramidal [TeO 3 ] 2− , tetrahedral [ZnO 4 ] 6− , Rb1 + , and CO 3  2− , H 2 O, Rb2 + , respectively. Different centrings of the layer groups lead to an ambiguity in the stacking arrangement. The crystal structure of Na 2 Zn 2 Te 4 O 11  is built from layers extending parallel to (001). Trigonal-pyramidal [TeO 3 ] 2−  and bisphenoidal [TeO 4 ] 4−  polyhedra form [Te 4 O 11 ] 6−  groups, which are connected by longer Te–O-contacts to form  1  ∞ [Te 8 O 22 ] 12−  double chains oriented along either [100] or [010]. These chains form non-polar layers, which appear alternatingly in two orientations related by a fourfold rotoinversion. The Zn 2+  and Na +  cations are located at the layer interface. The stacking ambiguity is due to different lattices of adjacent layers.

Order-disorder (OD) structures of Rb 2 Zn(TeO 3 )(CO 3 )·H 2 O and Na 2 Zn 2 Te 4 O 11