Mohamed W S, Alzaid Meshal, Abdelbaky Mohammed S M, Amghouz Zakariae, García-Granda Santiago, Abu-Dief Ahmed M
Physics Department, College of Science, Jouf University, Al-Jouf, Sakaka P.O. Box 2014, Saudi Arabia.
Physics Department, Faculty of Science, Sohag University, 82524 Sohag, Egypt.
Nanomaterials (Basel). 2019 Nov 11;9(11):1602. doi: 10.3390/nano9111602.
In the present work, we synthesized CoZnFeO spinel ferrite nanoparticles (x= 0, 0.1, 0.2, 0.3 and 0.4) via the precipitation and hydrothermal-joint method. Structural parameters were cross-verified using X-ray powder diffraction (XRPD) and electron microscopy-based techniques. The magnetic parameters were determined by means of vibrating sample magnetometry. The as-synthesized CoZnFeO nanoparticles exhibit high phase purity with a single-phase cubic spinel-type structure of Zn-ferrite. The microstructural parameters of the samples were estimated by XRD line profile analysis using the Williamson-Hall approach. The calculated grain sizes from XRPD analysis for the synthesized samples ranged from 8.3 to 11.4 nm. The electron microscopy analysis revealed that the constituents of all powder samples are spherical nanoparticles with proportions highly dependent on the Co doping ratio. The CoZnFeO spinel ferrite system exhibits paramagnetic, superparamagnetic and weak ferromagnetic behavior at room temperature depending on the Co doping ratio, while ferromagnetic ordering with a clear hysteresis loop is observed at low temperatures (5K). We concluded that replacing Zn ions with Co ions changes both the structural and magnetic properties of ZnFeO nanoparticles.
在本工作中，我们通过沉淀和水热联合法合成了CoZnFeO尖晶石铁氧体纳米颗粒（x = 0、0.1、0.2、0.3和0.4）。使用X射线粉末衍射（XRPD）和基于电子显微镜的技术对结构参数进行了交叉验证。通过振动样品磁强计测定磁参数。合成的CoZnFeO纳米颗粒具有高相纯度，呈现出单相立方尖晶石型锌铁氧体结构。使用威廉姆森-霍尔方法通过XRD线轮廓分析估计了样品的微观结构参数。通过XRPD分析计算得到的合成样品的晶粒尺寸范围为8.3至11.4纳米。电子显微镜分析表明，所有粉末样品的成分都是球形纳米颗粒，其比例高度依赖于Co掺杂率。CoZnFeO尖晶石铁氧体体系在室温下根据Co掺杂率呈现顺磁性、超顺磁性和弱铁磁性行为，而在低温（5K）下观察到具有清晰磁滞回线的铁磁有序。我们得出结论，用Co离子取代Zn离子会改变ZnFeO纳米颗粒的结构和磁性。
