Abstract
While there have been reports on the magnetic properties of three- and five-element high-entropy oxide spinels containing Mn, Fe, Co, and Ni, along with other metals, four-element equiatomic cubic spinels based on these metals have not been reported. Therefore, Herein, we report the detailed microstructure and magnetic properties of a novel equiatomic (MnFeCoNi)3O4 (MFCN) compound synthesized using a simple sol-gel auto-combustion method. The results were compared with that of (MnFeCo)3O4 (MFC). Structural analyses confirmed the formations of pure spinel structure for both MFC and MFCN, with notable lattice parameters. Surface morphology analysis revealed a porous structure with a nearly uniform elemental distribution, which plays a vital role in physical properties. Magnetic characterization demonstrated saturation magnetization values of 66 to 41 emu/g for MFC and 58.5 to 36.3 emu/g for MFCN as the temperature increased from 2 to 370 K, with high coercivity values of 3200 Oe and 2500 Oe at 2 K, respectively. These magnetic properties are significantly higher than those observed in quaternary and five-component high-entropy oxides. Furthermore, 57Fe Mössbauer spectra revealed a combination of sextet and superparamagnetic doublet in both MFC and MFCN compounds with the predominant sextet. The intriguing microstructures and magnetic properties of these spinels indicate their potential for various applications.
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