Chemical synthesis of Nd _x Co_1-x Fe₂O₄ hybrid nanoparticles for permanent magnet applications: structural, magnetic and electrical properties.

IF 4.6 3区材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Nanoscale Advances Pub Date : 2025-03-18 DOI:10.1039/d5na00197h

Saleh M Matar, Galal H Ramzy, Muhammad Arif, Ibrahim M Maafa, Ayman Yousef, Nasser Zouli, Ahmed F F Abouatiaa, Abdel Samed M Adam, Isam Y Qudsieh, Ahmed I Ali, Elbadawy A Kamoun, Amr Ali

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Abstract

Nd-doped CoFe₂O₄ spinel ferrites were synthesized via the sol-gel method, confirming a cubic spinel structure. Increasing Nd concentration expanded the lattice parameter (8.3900-8.4231 Å) and unit cell volume while reducing grain size. FT-IR analysis validated the spinel phase. Nd doping enhanced the dielectric constant by affecting space charge polarization and charge hopping, with conductivity following a Debye-type relaxation mechanism. Cole-Cole plots indicated grain boundary effects and polaron hopping conduction. Magnetic properties improved with Nd³⁺ content, with M _s and H _c reaching 5.621 emu g^-1 and 143.43 Oe at 4% doping. A transition from an antiferromagnetic to a ferromagnetic state was observed, with a high Curie temperature (T _m) of 292 °C, confirming a stable ferromagnetic phase. These findings highlight Nd-doped CoFe₂O₄ as a promising candidate for permanent magnet applications.

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用于永磁体的Nd x Co1-x Fe2O4杂化纳米粒子的化学合成：结构、磁性和电学性质。

采用溶胶-凝胶法制备了nd掺杂的CoFe2O4尖晶石铁氧体，证实了其为立方尖晶石结构。随着Nd浓度的增加，晶格参数（8.3900 ~ 8.4231 Å）增大，晶胞体积增大，晶粒尺寸减小。FT-IR分析证实了尖晶石相的存在。Nd掺杂通过影响空间电荷极化和电荷跳变来提高介电常数，电导率遵循debye型弛豫机制。Cole-Cole图显示晶界效应和极化子跳变传导。磁性能随Nd3+含量的增加而提高，在4%掺杂时，ms和hc分别达到5.621 emu g-1和143.43 Oe。观察到从反铁磁态到铁磁态的转变，具有292℃的高居里温度（T m），证实了一个稳定的铁磁相。这些发现突出了nd掺杂CoFe2O4作为永磁体应用的有前途的候选者。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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