Cation Distributions and Magnetic Properties of Ferrispinel MgFeMnO₄

Abstract

The crystal structure and magnetic properties of the cubic spinel MgFeMnO 4 were studied by using a series of in-house techniques along with large-scale neutron diffraction and muon spin rotation spectroscopy in the temperature range between 1.5 and 500 K. The detailed crystal structure is successfully refined by using a cubic spinel structure described by the space group Fd 3̅ m . Cations within tetrahedral A and octahedral B sites of the spinel were found to be in a disordered state. The extracted fractional site occupancies confirm the presence of antisite defects, which are of importance for the electrochemical performance of MgFeMnO 4 and related battery materials. Neutron diffraction and muon spin spectroscopy reveal a ferrimagnetic order below T C = 394.2 K, having a collinear spin arrangement with antiparallel spins at the A and B sites, respectively. Our findings provide new and improved understanding of the fundamental properties of the ferrispinel materials and of their potential applications within future spintronics and battery devices.

Unveiling the impact of Ni2+/Y3+ co-substitution on the structural, dielectric, and impedance properties of multiferroic spinel ferrite for hydroelectric cell application

“…This was because the substitution of Y 3+ ions in place of Fe 3+ ions will disturb the spin cycloid arrangement of the spinel ferrite and thus the ferromagnetic nature gets changed, and so the value of M s increased spontaneously when the concentration of nickel was vigorously increased to 15%. 48 The magnetic behavior of the inverse spinel CFO was dominated by the high spin Fe 3+ ions at tetrahedral sites rather than the Ni 2+ at the octahedral sites, which in turn produced a higher magnetic moment as opposed to that of the octahedral sites. 49,50 The Rietveld refinement cationic distribution, as tabulated in Table 3, showed that the YCFO5 sample displayed the lowest Fe 3+ content in the tetrahedra sites.…”