Role of B-site cation on the structure, magnetic and dielectric properties of nanosized La_0.7Sr_0.3Fe_1-xM_xO₃ (M = Mn; Co and x = 0, 0.5) perovskites

The easiness of preparation and tailored properties of perovskite nanoparticles rendered them an important class of materials in the last decade. In this work, La_0.7Sr_0.3Fe_1-xM_xO₃ (M = Mn, Co and x = 0, 0.5) orthoferrites were synthesized using combustion method and examined using X-ray diffraction. The orthorhombic structure was clearly obvious with Pbnm space group without the need of any thermal treatment. Field emission scanning electron microscopy (FESEM) accompanied by Energy-dispersive spectroscopy studies were also performed, evidencing the similarity of both nominal and chemical compositions for the studied orthoferrites. The thermal dependence of the dielectric properties was investigated (from room temperature to 698 K) in the frequency range (70 Hz-5 MHz). Magnetic properties were investigated at room temperature and discussed.