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

By Aiqin Mao, Houzheng Xiang, Zhan-guo Zhang, K. Kuramoto, Haiyun Yu, S. Ran. Journal of Magnetism and Magnetic Materials, 2019

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Abstract 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 Neel 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.

Subfields: Aerospace Engineering, Mechanical Engineering

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