Chemical synthesis of NdxCo1−xFe2O4 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 and 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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