Facile synthesis and ferrimagnetic property of spinel (CoCrFeMnNi)3O4 high-entropy oxide nanocrystalline powder

• Published in: Journal of molecular structure Vol. 1194; pp. 11 - 18
• Main Authors: Mao, Aiqin, Quan, Feng, Xiang, Hou-Zheng, Zhang, Zhan-Guo, Kuramoto, Koji, Xia, Ai-Lin
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.10.2019
• Subjects: (CoCrFeMnNi)3O4; High-entropy oxide; Magnetic property; Nanocrystalline powder; Solution combustion synthesis; Magnetic property; Nanocrystalline powder; Solution combustion synthesis; (CoCrFeMnNi)3O4; High-entropy oxide
• ISSN: 0022-2860; 1872-8014
• DOI: 10.1016/j.molstruc.2019.05.073

(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. In this study, spinel (CoCrFeMnNi)3O4 high-entropy oxide nanocrystalline powder has been successfully synthesized, for the first time by a modified solution combustion synthesis method. Our work provides critical information on how to manipulate the microstructure of the (CoCrFeMnNi)3O4 ferrimagnetic materials to achieve tailored magnetic properties. [Display omitted] •The spinel (CoCrFeMnNi)3O4 nanocrystalline powder was successfully synthesized by SCS method.•Lattice distortion was found to decrease largely, and then increase slightly with the synthesis temperature.•The material exhibited ferrimagnetic behavior at room temperature.•The Hc changed with the lattice distortion.•The microstructure and ferrimagnetic property can be effectively tailored by synthesis temperature.