Morphology-controlled synthesis and enhanced energy product (BH)max of CoFe2O4 nanoparticles†,New Journal of Chemistry

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Morphology-controlled synthesis and enhanced energy product (BH)max of CoFe2O4 nanoparticles†
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2018-09-03 00:00:00 , DOI: 10.1039/c8nj02177e
Yogendra Kumar _{1,

2,

3,

4} , Alfa Sharma _{1,

2,

3,

4} , Md. A. Ahmed _{4,

5,

6,

7} , Sawanta S. Mali _{8,

9,

10,

11,

12} , Chang Kook Hong _{8,

9,

10,

11,

12} , Parasharam M. Shirage _{1,

2,

3,

4}

Affiliation

High-performance cobalt ferrite nanoparticles (CoFe₂O₄ NPs) with controlled morphology were obtained by an economical and simple thermal decomposition technique. Cube-shaped CoFe₂O₄ NPs with different particle dimensions were achieved by precisely controlling the reaction refluxing time. The size-dependent magnetic properties were investigated and reported. The coercivity (H_c) of CoFe₂O₄ NPs increased with particle size upto single domain limit. Higher coercivity (H_c) values of 17 132 Oe and 3364 Oe with excellent remanent magnetization (M_r) values of 76.0 and 61.05 emu g⁻¹ at 10 K and room temperature were obtained for CF-4 NPs (∼35 nm). The excellent remanent magnetization and high coercivity of CF-4 NPs led to a high energy product (BH)_max of 2.41 MGOe (19.2 kJ m⁻³) at room temperature, which is the highest reported value to date for CoFe₂O₄ NPs to the best of our knowledge. The excellent magnetic properties indicated the capabilities of CoFe₂O₄ NPs in permanent magnets for current technological applications.

中文翻译：

CoFe ₂ O ₄纳米粒子的形貌控制合成和_最大能量乘积（BH）†

通过经济，简单的热分解技术，获得了形态可控的高性能钴铁氧体纳米颗粒（CoFe ₂ O ₄ NPs）。通过精确控制反应回流时间，获得了具有不同粒径的立方形状的CoFe ₂ O ₄ NP。研究并报道了尺寸依赖性的磁性能。CoFe ₂ O ₄ NP的矫顽力（H _c）随着粒径的增加而增加，达到单畴极限。较高的矫顽力（H _c）值为17 132 Oe和3364 Oe，且剩余磁化强度（M _r）对于CF-4 NPs（〜35 nm）在10 K和室温下获得76.0和61.05 emu g ^-1的值。CF-4 NP的出色的剩磁和高矫顽力导致在室温下的高能积（BH）_最大值为2.41 MGOe（19.2 kJ m ^-3），这是迄今为止CoFe ₂ O ₄ NP的最高报道值据我们所知。优异的磁性能表明CoFe ₂ O ₄ NP在永磁体中具有当前技术应用的能力。

更新日期：2018-09-03

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