Abstract
The LaCo1−xFexO3 compounds have been investigated by means of neutron powder diffraction(NPD), x-ray powder diffraction (XPD) and magnetization measurements.The NPD and XPD patterns were successfully refined as rhombohedral(x≤0.5) andorthorhombic (x≥0.6). The temperature-induced transition from the rhombohedral phase into theorthorhombic one is characterized by a two-phase crystal structure state.Magnetization and neutron powder measurements have revealed that compounds withx<0.4 exhibit a paramagnetic-like behaviour, whereas forx≥0.4 samplesa weak ferromagnetic component was observed. The NPD patterns were successfully refined by admittinga Gz spatial orientation of the antiferromagnetic vector. The magnetic properties of theLaCo1−xFexO3 samples can be explained assuming a low spin state of theCo3+ ions, whereas antiferromagnetism is caused by magnetic interactions between theFe3+ ions. Based on the obtained data the combined crystal and magnetic phase diagram hasbeen constructed.
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