Abstract
(CoCrFeMnNi)3O4 high-entropy oxide nanocrystalline powder with chemical and microstructure homogeneity has been successfully synthesized, for the first time by a modified solution combustion synthesis method at synthesis temperature above 623 K. The XRD patterns with Rietveld refinement reveal the formation of spinel crystal structure with Fd-3m space group. The crystallite size increases from 5.3 to 43.8 nm, the lattice constant decreases from 8.354 to 8.287 Å, whereas the lattice distortion initially decreases and then increases slightly with the increase of synthesis temperature. Magnetic studies indicate all synthesized nanocrystalline powders exhibit a typical ferrimagnetic behavior at room temperature. The values of saturation magnetization and coercivity of synthesized (CoCrFeMnNi)3O4 are in the range of 4.85–15.98 emu/g and 176.55-21.39 Oe, respectively. Crystallinity, crystalline size, lattice constant and lattice distortion are the determining factors of how the microstructure will get controllable, and results in variations of magnetic properties.
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