Temperature-dependent physicochemical properties of magnesium ferrites (MgFe 2 O 4 )

Physical and electrochemical properties of magnesium ferrite (MgFe 2 O 4 ) with respect to calcination temperature were investigated. XRD results revealed the increasing degree of crystallinity at different annealing temperatures. SEM images explored the spherical morphology of particles. High intense principal photoluminescence peak situated at 532 nm revealed spinel ferrite system assigned to 3d 5 → 3d 4 4s transitions of Fe 3+ ions. Infrared metal–oxygen vibration observed at 580 and 441 cm −1 revealed tetrahedral and octahedral sites of ferrite system. The product showed highest specific capacitance of 119.50 F/g at scan rate 5 mV/s for the sample annealed at 500 °C and the specific capacitance noticeably decreased for increasing calcination temperature. The calcination temperature played a central role on structural, morphological, optical, and electrochemical properties of MgFe 2 O 4 .