Synthese und Kristallstruktur von Ba4,5Ca1,5La2Fe4O15, Ba5CaEu2Fe4O15 und Ba5CaNd2Co4O15

Synthesis and Crystal Structure of Ba_4.5Ca_1.5La₂Fe₄O₁₅, Ba₅CaEu₂Fe₄O₁₅ and Ba₅CaNd₂Co₄O₁₅ The compounds (I) Ba_4.5Ca_1.5La₂Fe₄O₁₅, (II) Ba₅CaEu₂Fe₄O₁₅ and (III) Ba₅CaNd₂Co₄O₁₅ were prepared and investigated by single crystal X-Ray technique. They belong to the Ba₆Nd₂Al₄O₁₅ typ, space group C? P6₃mc, (I): a = 11.677, c = 6.959 Å; (II): a = 11.570, c = 6.892 Å; (III): a = 11.604, c = 6.839 Å, Z = 2. The crystal chemistry of these substances will be discussed.