Imanipour Parvin, Hasani Saeed, Seifoddini Amir, Nabiałek Marcin
Department of Mining and Metallurgical Engineering, Yazd University, Yazd 89195-741, Iran.
Department of Physics, Częstochowa University of Technology, 42-200 Częstochowa, Poland.
Nanomaterials (Basel). 2022 Feb 23;12(5):752. doi: 10.3390/nano12050752.
In recent years, cobalt ferrite has attracted considerable attention due to its unique physical properties. The present study aimed to produce cobalt ferrite magnetic nanoparticles doped with zinc and vanadium using the sol-gel auto-combustion method. For this purpose, CoZnFeVO (where x = 0.0, 0.1, 0.2, 0.5 and y = 0.00, 0.05, 0.15, 0.25) precursors were calcined at 800 °C for 3 h. The prepared samples were characterized with the X-ray diffraction (XRD) method in combination with Rietveld structure refinement, field emission scanning electron microscopy (FE-SEM), Fourier transform infrared spectroscopy (FT-IR), and vibrating sample magnetometery (VSM). The XRD patterns confirmed the formation of crystalline spinel structure for all samples. However, the diffraction peaks of hematite and iron vanadium oxide phases were observed in the patterns of some doped samples. The average crystallite size for all the synthesized samples was found to be in the range of ~45-24 nm, implying that it decreased by simultaneously doping cobalt ferrite with Zn and V. The FT-IR spectrum confirmed the formation of the spinal structure of ferrite through the observed vibrational bands assigned to the tetrahedral (υ) and octahedral (υ) interstitial complexes in the spinel structure. The FE-SEM images showed that morphology, average grain size, and agglomeration of the synthesized powders were affected by doping, which was due to the interactions of the magnetic surface of nanoparticles. The VSM curves demonstrated that saturation magnetization and coercivity values changed in the range of 30-83 emu/g and from 27-913 Oe, respectively. These changes occurred due to the alteration in cation distribution in the spinel structure. This can be attributed to the change in superexchange interactions between magnetic ions by co-substitution of Zn and V ions in Cobalt ferrite and the changes in magnetocrystalline anisotropy.
近年来，钴铁氧体因其独特的物理性质而备受关注。本研究旨在采用溶胶 - 凝胶自燃烧法制备掺杂锌和钒的钴铁氧体磁性纳米颗粒。为此，将CoZnFeVO（其中x = 0.0、0.1、0.2、0.5且y = 0.00、0.05、0.15、0.25）前驱体在800°C下煅烧3小时。采用X射线衍射（XRD）方法结合Rietveld结构精修、场发射扫描电子显微镜（FE - SEM）、傅里叶变换红外光谱（FT - IR）和振动样品磁强计（VSM）对制备的样品进行表征。XRD图谱证实所有样品均形成了晶体尖晶石结构。然而，在一些掺杂样品的图谱中观察到了赤铁矿和铁钒氧化物相的衍射峰。发现所有合成样品的平均晶粒尺寸在约45 - 24 nm范围内，这意味着同时用锌和钒掺杂钴铁氧体时其晶粒尺寸减小。FT - IR光谱通过观察到的分配给尖晶石结构中四面体（υ）和八面体（υ）间隙配合物的振动带证实了铁氧体尖晶石结构的形成。FE - SEM图像表明，掺杂会影响合成粉末的形态、平均晶粒尺寸和团聚情况，这是由于纳米颗粒磁性表面的相互作用所致。VSM曲线表明，饱和磁化强度和矫顽力值分别在30 - 83 emu/g和27 - 913 Oe范围内变化。这些变化是由于尖晶石结构中阳离子分布的改变引起的。这可归因于钴铁氧体中锌和钒离子的共取代导致磁性离子之间超交换相互作用的变化以及磁晶各向异性的变化。
