Ferromagnetic state of nanostructured BiFe 2 O 4.5 is in contrast with its bulk counterparts. Temperature dependent magnetization studies implied anti-ferromagnetic interactions for BiMn 2 O 5, frustrated magnet for BiFeMnO 5 and ferromagnetic behaviour for BiFe 2 O 4.5. Isothermal magnetization plots (at 5 K) show increase in coercivity (H c) from x = 0 to x = 2. These values appear to be larger than that reported for bulk. From optical studies, it has been found that the observed energy band gap values are strongly related to 3d electron numbers. Transmission electron microscopic images confirm that the average particle size of all the materials are in nano domain range with different morphologies. The observed structural changes via tuning of B-site (x = 0–2) played an important role in overall magnetic properties. Noticeable expansion in unit cell parameters has been found from BiMn 2 O 5 (x = 0) to BiFe 2 O 4.5 (x = 2). X-ray diffraction data (XRD) revealed orthorhombic phase with Pbam space group. Nanostructures of complex oxides have been designed to study their structural, optical and magnetic behaviour.
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