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The effect of microstructural features on the ferromagnetism of nickel oxide nanoparticles synthesized in a low-pressure arc plasma
Physica E: Low-dimensional Systems and Nanostructures ( IF 3.3 ) Pub Date : 2020-07-10 , DOI: 10.1016/j.physe.2020.114352
A.V. Ushakov , I.V. Karpov , L.Yu. Fedorov , V.G. Demin , E.A. Goncharova , A.A. Shaihadinov , G.M. Zeer , S.M. Zharkov

Nickel oxide nanoparticles were first synthesized by sputtering high-purity nickel in an oxygen plasma of a low-pressure arc discharge. The structure, morphology, and optical and magnetic properties of NiO nanoparticles were studied by XRD, TEM, FTIR, UV-VIS, and VSM. TEM images showed that the obtained NiO nanoparticles have a narrow particle size distribution and an average particle size of 12 nm. The XRD results and the processing of diffractograms by the Rietveld method showed that the obtained nanoparticles have a face-centered cubic lattice with an average particle size of 13 nm. With decreasing temperature, residual stresses increase and peaks corresponding to the superstructure appear. The band gap of NiO was determined from the optical absorption spectrum and amounted to 3.21 eV. Magnetic measurements showed that, at temperatures of 200 and 300 K, NiO nanoparticles, unlike bulk particles, exhibit ferromagnetic behavior, and at 5 K a magnetic hysteresis loop appears. Based on the studies, a dendritic model of the nanoparticle microstructure is proposed.



中文翻译:

微观结构特征对低压电弧等离子体中合成的氧化镍纳米粒子铁磁性的影响

首先通过在低压电弧放电的氧等离子体中溅射高纯度镍来合成氧化镍纳米颗粒。通过XRD,TEM,FTIR,UV-VIS和VSM研究了NiO纳米粒子的结构,形貌以及光学和磁性。TEM图像表明,所获得的NiO纳米颗粒具有窄的粒径分布和12nm的平均粒径。XRD结果和通过Rietveld方法的衍射图处理表明,所获得的纳米颗粒具有以面为中心的立方晶格,其平均粒径为13nm。随着温度降低,残余应力增加,并出现与上部结构相对应的峰。由光吸收光谱确定NiO的带隙,其为3.21eV。磁测量表明,在200和300 K的温度下,NiO纳米颗粒与块状颗粒不同,表现出铁磁性能,在5 K时出现磁滞回线。基于这些研究,提出了纳米颗粒微观结构的树突模型。

更新日期:2020-07-13
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