Über hexagonale Perowskite mit Kationenfehlstellen. XXIX. Die Struktur von Ba4ScReW□O12 – zur Funktion von oktaedrischen Kationenfehlstellen in Perowskitstapelvarianten

On Hexagonal Perovskites with Cationic Vacancies. XXIX. Structure of Ba₄ScReW□O₁₂ On the Function of Octahedral Cationic Vacancies in Perovskite Stacking Polytypes The hexagonal perovskite stacking polytype Ba₄ScReW□O₁₂ crystallizes in a rhombohedral 12 L structure (space group R3 m; sequence (hhcc)₃). The refined, intensity related R′ value is 6.6%. The octahedral net consists of blocks of three face connected octahedra with a central vacancy, in the two outer positions the rhenium and tungsten atoms are located; this units are linked via common corners by single octahedra, occupied with scandium.