Solution combustion synthesis and magnetic property of rock-salt (Co0.2Cu0.2Mg0.2Ni0.2Zn0.2)O high-entropy oxide nanocrystalline powder

• Published in: Journal of magnetism and magnetic materials Vol. 484; pp. 245 - 252
• Main Authors: Mao, Aiqin, Xiang, Hou-Zheng, Zhang, Zhan-Guo, Kuramoto, Koji, Yu, Haiyun, Ran, Songlin
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.08.2019; Elsevier BV
• Subjects: (Co0.2Cu0.2Mg0.2Ni0.2Zn0.2)O; Antiferromagnetism; Combustion synthesis; Crystals; Entropy; High-entropy oxide; Magnetic properties; Nanocrystalline powder; Nanocrystals; Organic chemistry; Solution combustion synthesis; Antiferromagnetism; (Co0.2Cu0.2Mg0.2Ni0.2Zn0.2)O; Nanocrystalline powder; Solution combustion synthesis; High-entropy oxide
• ISSN: 0304-8853; 1873-4766
• DOI: 10.1016/j.jmmm.2019.04.023

•The (Co0.2Cu0.2Mg0.2Ni0.2Zn0.2)O nanocrystalline powder was synthesizes by SCS method.•Synthesis temperature of single-phase rock-salt structure was above 1123 K.•The material exhibits long-range antiferromagnetic behavior below TN.•The material shows lower TN. A facile solution combustion synthesis method was successfully applied to synthesize single rock-salt structural (Co0.2Cu0.2Mg0.2Ni0.2Zn0.2)O high-entropy oxide (HEO) nanocrystalline powder with chemical homogeneity. The XRD patterns with Rietveld refinement reveal the formation of single-phase rock-salt structure occurs only at the synthesis temperatures ≥ 1123 K, and the average nanocrystalline size is about 43 nm. Moreover, two series of experiments confirm the effect of configurational entropy on phase stabilization. Furthermore, the as-synthesized single-phase (Co0.2Cu0.2Mg0.2Ni0.2Zn0.2)O nanocrystalline powder exhibits long-range antiferromagnetic behavior below Néel temperature (TN = 106 K), which can be well understood by the super-exchange interactions in the rock-salt HEO. The powder also shows lower TN due to the significant amount of nonmagnetic ions suppressing the antiferromagnetic order.