Mosleh Z, Beygmohammadvand M, Ghotbi Varzaneh A, Kameli P
Department of Physics, Isfahan University of Technology, Isfahan 84156-83111, Iran.
Institute of Microstructure Technology, Karlsruhe Institute of Technology, Karlsruhe, 76344, Germany.
Heliyon. 2024 Dec 30;11(1):e41276. doi: 10.1016/j.heliyon.2024.e41276. eCollection 2025 Jan 15.
This paper presents the first-time synthesis of CoFe Co O nanoparticles (where x = 0.0, 0.1, 0.2, 0.3, 0.4, 0.5, and 0.6) through hydrothermal methods utilizing metal chloride precursors. X-ray diffraction (XRD) analysis confirms the formation of a cubic spinel structure characterized by the Fd m space group. Field Emission Scanning Electron Microscopy (FE-SEM) images reveal that the average grain size of the nanoparticles lies between 50 nm and 90 nm. Notably, the optical band gap of the Co-doped samples exhibits a gradual increase from 1.7 eV to 2.5 eV. Furthermore, a reduction in saturation magnetization was noted with increasing doping content at both 5 K and 300 K. The observed decrease in saturation magnetization in the doped samples can be attributed to the migration of Co ions from the B site to the A site, as well as the substitution of Fe ions with Co ions in the B site. Additionally, the influence of annealing temperature on the structure, morphology, and magnetic properties of the nanoparticles was examined.
本文首次通过水热法利用金属氯化物前驱体合成了CoFe₂₋ₓCoₓO₄纳米颗粒（其中x = 0.0、0.1、0.2、0.3、0.4、0.5和0.6）。X射线衍射（XRD）分析证实形成了以Fd-3m空间群为特征的立方尖晶石结构。场发射扫描电子显微镜（FE-SEM）图像显示，纳米颗粒的平均粒径在50纳米至90纳米之间。值得注意的是，Co掺杂样品的光学带隙从1.7电子伏特逐渐增加到2.5电子伏特。此外，在5 K和300 K时，随着掺杂含量的增加，饱和磁化强度降低。掺杂样品中观察到的饱和磁化强度降低可归因于Co离子从B位迁移到A位，以及B位的Fe离子被Co离子取代。此外，还研究了退火温度对纳米颗粒结构、形态和磁性的影响。
