Effect of sr substitution on structural, ferroelectric and magnetic properties of la1-xsrxfeo3 perovskite oxides

Abstract

Effect of Sr substitution on structural, magnetic and electrical properties of LaFeO3 perovskite oxides has been studied. Using the selected Sr doping content (x) from 0.0 to 1.0, perovskite La1-xSrxFeO3 nanopowder was synthesized by sol-gel auto-combustion method, followed by calcination at 900 °C for 2 h. The synthesized powder was pressed into disks at room temperature and then the disk samples were sintered at 1200 °C for 12 h to obtain a single-phase compound formation and uniaxial compaction. The influence of Sr doping on the phase formation, morphology, ferroelectric and magnetic properties was investigated. The phase formation of the sample changes from orthorhombic at low Sr doping through rhombohedral to cubic for Sr-rich sample as the stoichiometry approached SrFeO3. The grains of La1-xSrxFeO3 ceramics revealed an irregular polyhedron shape. SEM-EDS mapping analysis also exhibited the uniform distribution of all elements. The direct energy gap (Eg) was found to decrease with increasing amounts of Sr doping. Moreover, the La0.6Sr0.4FeO3 ceramic exhibited ferromagnetic behavior with saturated magnetization (Ms) of 0.305 emu/g at room temperature.