Abstract
The crystal and magnetic structures of layered perovskites TbBaCo2−xFexO5+γ (0.08⩽x⩽0.24) were studied by neutron powder diffraction. Increasing iron concentration up to the x values higher than 0.10 leads to the orthorhombic→tetragonal phase transition resulting from the transformation of 2×1×1-type superstructure, formed due to ordering of extra oxygen incorporated into the vacant sites in [TbOγ] layers, into 3×3×1 superlattice. The concentration ranges, where the orthorhombic and tetragonal lattices exist, are separated with a narrow two-phase domain. For the tetragonal phases with 3×3×1 superstructure (space group P4/mmm), the Co/Fe ions are antiferromagnetically coupled, forming G-type spin-ordered configuration. The Co3+ cations located in square-pyramidal sites adopt intermediate spin state, whilst a relatively small magnetic moment of Co3+ ions in the octahedral sublattice indicates that a minor fraction of cobalt is in the low-spin state.
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