Crystal Structures and B-site Cation Valences of A-site Layered Perovskites GdBa(Fe_0.5Mn_0.5)₂O_x (x = 5, 6)

Abstract

An A-site layered perovskite GdBa(Fe_0.5Mn_0.5)₂O₅ was synthesized and the crystal structure was analyzed. The oxygen vacancies were located in the Gd layers and the valence states of the B-site cations with pyramidal oxygen coordination were Fe³⁺ and Mn²⁺. Low-temperature topotactic reaction made the compound a fully oxygenated perovskite GdBa(Fe_0.5Mn_0.5)₂O₆ with keeping the cation arrangements. By the oxidation only the valence of Mn increased from 2+ to 4+, while that of Fe remains at 3+.