Ein neuer Bautyp der Oxohalogenoferrate: Ba3 Fe2 O5 Cl2 und Ba3 Fe2 O5 Br2

New Structure Type of the Two Oxohalogenoferrites: Ba₃Fe₂O₅Cl₂ and Ba₃Fe₂O₅Br₂ The hitherto unknown compounds Ba₃Fe₂O₅Cl₂ (A) and Ba₃Fe₂O₅Br₂ (B) are pre-pared and examined by single crystal techniques. (A) and (B) crystallizes in the cubic space group I2₁ 3-T⁵; (A) a = 9.9705(3) and (B) a = 10.0039(8) Å, Z = 4. The new structure consists of 10 corner-shared tetrahedra which are connected to a two-dimensional ring system. The differences to the previously investigated compound Sr₃Fe₂O₅Cl₂ are discussed.