Facile synthesis and ferrimagnetic property of spinel (CoCrFeMnNi)3O4 high-entropy oxide nanocrystalline powder
Facile synthesis and ferrimagnetic property of spinel (CoCrFeMnNi)3O4 high-entropy oxide nanocrystalline powder
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DOI：
10.1016/j.molstruc.2019.05.073
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发表时间：
2019-10-15
影响因子：
3.8
通讯作者：
Xia, Ai-Lin
中科院分区：
文献类型：
--
作者：
Mao, Aiqin;Quan, Feng;Xia, Ai-Lin
采用改进的溶液燃烧合成法，在623 K以上的温度下，首次合成了化学成分和微观结构均一的（CoCrFeMnNi）（3）O 4-高熵氧化物纳米晶粉末。Rietveld精修的XRD图谱显示形成了具有Fd-3 m空间群的尖晶石晶体结构。随着合成温度的升高，微晶尺寸从5.3 nm增大到43.8 nm，晶格常数从8.354埃减小到8.287埃，晶格畸变先减小后略有增大。磁性研究表明，所有合成的纳米晶粉末在室温下都表现出典型的亚铁磁性。合成的（CoCrFeMnNi）（3）O-4的饱和磁化强度和矫顽力分别为4.85- 15.98emu/g和176.55- 21.39Oe。结晶度、晶粒尺寸、晶格常数和晶格畸变是决定微结构如何可控的因素，并导致磁性能的变化。(C)2019 Elsevier B. V.版权所有。
(CoCrFeMnNi)(3)O-4 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 angstrom, 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)(3)O-4 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. (C) 2019 Elsevier B.V. All rights reserved.