Annealing-induced changes in Sol-Gel synthesized nano-CoFe2O4: A study of structure, morphology and magnetism

IF 2.3 3区物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Physics Letters A Pub Date : 2024-11-26 DOI:10.1016/j.physleta.2024.130104

Rohit Duglet , Deepika Sharma , Anita Manhas , Dheeraj Sharma , M. Singh

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Abstract

Magnetic nano-sized CoFe₂O₄ spinel ferrites were synthesized using the sol-gel auto-combustion technique, and the impact of annealing temperature on their structural and magnetic properties was systematically studied. Samples were annealed at 500 °C, 700 °C, and 900 °C for 5 hours. XRD analysis confirmed crystallization in the Fd3m space group, with average crystallite sizes ranging from 30 to 34 nm. Structural parameters such as ionic radii, bond lengths, and cation distribution were also calculated, revealing partial inversion with an inversion factor of 0.68. FE-SEM analysis showed uniform morphology and increasing grain size with higher annealing temperatures. EDS confirmed stoichiometric Co and Fe ion content, while FTIR indicated strong metal-oxide bonds characteristic of CoFe₂O₄. Magnetic measurements demonstrated that higher annealing temperatures enhanced saturation magnetization and magnetocrystalline anisotropy while reducing coercivity, highlighting the significant influence of annealing temperature on CoFe₂O₄ nanoparticles' performance.

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溶胶-凝胶法合成纳米cofe2o4的结构、形貌和磁性研究

采用溶胶-凝胶自燃烧技术合成了磁性纳米CoFe₂O₄尖晶石铁氧体，并系统研究了退火温度对其结构和磁性能的影响。样品分别在500°C、700°C和900°C退火5小时。XRD分析证实了Fd3m空间群的结晶，平均晶粒尺寸在30 ~ 34 nm之间。对离子半径、键长、阳离子分布等结构参数也进行了计算，结果显示部分反转，反转因子为0.68。FE-SEM分析表明，随着退火温度的升高，形貌均匀，晶粒尺寸增大。EDS证实了Co和Fe离子的化学计量量，FTIR证实了CoFe₂O₄具有强的金属氧化键特征。磁性测量表明，较高的退火温度增强了饱和磁化强度和磁晶各向异性，同时降低了矫顽力，突出了退火温度对CoFe₂O₄纳米颗粒性能的显著影响。

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来源期刊

Physics Letters A 物理-物理：综合

CiteScore

5.10

自引率

3.80%

发文量

493

审稿时长

30 days

期刊介绍： Physics Letters A offers an exciting publication outlet for novel and frontier physics. It encourages the submission of new research on: condensed matter physics, theoretical physics, nonlinear science, statistical physics, mathematical and computational physics, general and cross-disciplinary physics (including foundations), atomic, molecular and cluster physics, plasma and fluid physics, optical physics, biological physics and nanoscience. No articles on High Energy and Nuclear Physics are published in Physics Letters A. The journal''s high standard and wide dissemination ensures a broad readership amongst the physics community. Rapid publication times and flexible length restrictions give Physics Letters A the edge over other journals in the field.

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