Synthesis and Functional Properties of La2FeCrO6 Based Nanostructures
Ebtesam E. Ateia, D. Gawad, Mohamed Mosry, M. M. Arman
Abstract
Abstract Ordered double perovskite La 2 FeCrO 6 nanoparticles (NPs) were synthesized via the citrate auto-combustion technique. The prepared sample was characterized by X-ray diffraction (XRD), energy dispersive X-ray analysis (EDAX), and Raman spectroscopy, which confirmed the double perovskite structure of the studied sample. XRD illustrated that the investigated sample has an orthorhombic structure with an average crystallite size of 25.3 nm. La 2 FeCrO 6 NPs exhibit a porous structure and spongy morphology, as determined through analyses using Brunauer–Emmett–Teller (BET) specific surface area and field emission scanning electron microscopy (FESEM). The studied sample exhibits anti-ferromagnetic (AFM) behavior with weak ferromagnetic (FM) components, as an example of d 5 (Fe 3+ )–d 3 (Cr 3+ ) systems. The AFM behavior is caused by the super-exchange interaction between [Fe 3+ (d 5 )–O–Cr 3+ (d 3 )], according to the Kanamori–Goodenough (KG) rule. This behavior is induced by the pd π hybridization between the e g orbital of the transition metal and the p σ orbital of the oxygen, while the one induced by the pd σ hybridization is FM. The number of excited-state configurations mediated by the pd π hybridization in the Fe–Cr pair is greater than that mediated by pd σ hybridization. Pb(II) heavy metal ions are used in adsorption studies. The electrostatic nature of the bonding between Pb(II) and the La 2 FeCrO 6 nano ferrite sample is thought to be the main cause of the observed high sorption of La 2 FeCrO 6 to a Pb(II) ion. La 2 FeCrO 6 has a favorable morphology, which bodes well for its prospective applications in Li-ion batteries, water purification, and gas sensors.