Synthesis and Functional Properties of La2FeCrO6 Based Nanostructures

Abstract

Ordered double perovskite La2FeCrO6 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. La2FeCrO6 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 d5(Fe3+)–d3(Cr3+) systems. The AFM behavior is caused by the super-exchange interaction between [Fe3+(d5)–O–Cr3+(d3)], according to the Kanamori–Goodenough (KG) rule. This behavior is induced by the pdπ hybridization between the eg orbital of the transition metal and the pσ orbital of the oxygen, while the one induced by the pdσ hybridization is FM. The number of excited-state configurations mediated by the pdπ hybridization in the Fe–Cr pair is greater than that mediated by pdσ hybridization. Pb(II) heavy metal ions are used in adsorption studies. The electrostatic nature of the bonding between Pb(II) and the La2FeCrO6 nano ferrite sample is thought to be the main cause of the observed high sorption of La2FeCrO6 to a Pb(II) ion. La2FeCrO6 has a favorable morphology, which bodes well for its prospective applications in Li-ion batteries, water purification, and gas sensors.

Reduced A–B super exchange interaction in zirconium doped cobalt ferrite due to laser irradiation

“…The magnetic hysteresis (MH) loop was conducted at room temperature (RT) for both non-radiated and irradiated samples, as shown in figure 7. The coupling among Fe 3+ (3d 5 ) and Fe 2+ (3d 6 ) unpaired electrons in their spin states via the O −2 ions' p orbitals gives rise to a ferromagnetic alignment [48,49]. All samples exhibited similar hysteresis curves with varying heights and widths, indicating that magnetization becomes saturated when a field of 15 kOe is applied for non-radiated samples.…”

Designing bi-functional Ag-CoGd0.025Er0.05Fe1.925O4 nanoarchitecture via green method

“…The law of approach to saturation (LAS) is utilized to estimate the M s value. The expression of magnetization as a function of the applied magnetic field (H) for high H value is provided by [58,59]:…”

Comparative study of the structural, magnetic and electrical properties of cuprous delafossites CuBO2(B = Zn, Mn and Er) prepared using the flash auto-combustion technique

“…The XRD analysis confirms the formation of CuZnO 2 NPs with a trigonal (hexagonal axes) crystal structure and R-3m eigen-symmetry. The crystallite size (D) of CuZnO 2 was estimated using the conventional Scherrer equation [33], which relies on the average of the three most intense peaks.…”