Abstract
The title compounds have been synthesized by a citrate technique followed by thermal treatments in air (BiFe 0.5Mn 1.5O 5) or under high oxygen pressure conditions (BiFeMnO 5), and characterized by X-ray diffraction (XRD), neutron powder diffraction (NPD) and magnetization measurements. The crystal structures have been refined from NPD data in the space group Pbam at 295 K. These phases are isostructural with RMn 2O 5 oxides ( R=rare earths) and contain infinite chains of Mn 4+O 6 octahedra sharing edges, linked together by (Fe,Mn) 3+O 5 pyramids and BiO 8 units. These units are strongly distorted with respect to those observed in other RFeMnO 5 compounds, due to the presence of the electronic lone pair on Bi 3+. It is noteworthy the certain level of antisite disorder exhibited in both samples, where the octahedral positions are partially occupied by Fe cations, and vice versa. BiFe x Mn 2− x O 5 ( x=0.5, 1.0) are short-range magnetically ordered below 20 K for x=0.5 and at 40 K for x=1.0. The main magnetic interactions seem to be antiferromagnetic (AFM); however, the presence of a small hysteresis in the magnetization cycles indicates the presence of some weak ferromagnetic (FM) interactions.
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