Microwave assisted synthesis and characterization of Fe3+-O-Fe3+ sublattice magnetic moment influencing ferromagnetism exhibited erbium orthoferrite sublattice (ErFeO3) perovskite nanopowders

•ErFeO3 nanocrystallite formation in the orthorhombic phase is achieved via microwave assisted technique.•The lattice parameters are obtained by performing Rietveld refinement phase matching through Fullprof analysis.•Stretching vibration of Er-O occurring in the synthesized orthorhombic phase is confirmed by observing the peaks at 414 and 420 cm−1 in the FTIR spectrum.•The formation of bond angle of Fe3+-O-Fe3+ sublattices (140.5782° and 147.6881°) and remnant magnetization (0.0794 emu/g) are confirmed the weak ferromagnetic property of ErFeO3.