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Single crystals of Ba 2 K 2 Te 2 O 9 (dibarium dipotassium nona-oxidoditellurate), (I), Ba 2 KNaTe 2 O 9 (dibarium potassium sodium nona-oxidoditellurate), (II), and Ba 2 CaTeO 6 (dibarium calcium hexa-oxidotellurate), (III), were obtained from KNO 3 /KI or KNO 3 /NaNO 3 flux syntheses in platinum crucibles for (I) and (II), or porcelain crucibles for (III). (I) and (II) are isotypic and are members of triple perovskites with general formula A  2  [12 co ]  A ' [12 co ]  B  2  [6 o ]  B ' [6 o ] O 9 . They crystallize in the 6 H -BaTiO 3 structure family in space-group type P 6 3 / mmc , with the A , A ', B and B ' sites being occupied by K, Ba, Te and a second Ba in (I), and in (II) by mixed-occupied (Ba/K), Ba, Te and Na sites, respectively. (III) adopts the A  2  [12 co ]  B'  [6 o ]  B''  [6 o ] O 6 double perovskite structure in space-group type Fm  m , with Ba, Ca and Te located on the A , B ' and B'' sites, respectively. The current refinement of (III) is based on single-crystal X-ray data. It confirms the previous refinement from X-ray powder diffraction data [Fu et al. (2008). J. Solid State Chem.  181 , 2523-2529], but with higher precision.

acta crystallographica. section e, crystallographic communications

Crystal structures of the triple perovskites Ba2K2Te2O9and Ba2KNaTe2O9, and redetermination of the double perovskite Ba2CaTeO6