Das schwarze Ba3FeIr2O9−x kristallisiert im hexagonalen BaTiO3‐Typ (Sequenz (hcc)2; a = 5,740 Å; c = 14,24 Å) und besitzt metallische Leitfähigkeit. Die mittlere Oxydationsstufe von Eisen und Iridium liegt bei +3,7; damit lautet die Zusammensetzung Ba3FeIr2O8,5□0,5.
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