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<p>Temperature variations highly influence the structural, cation redistribution and magnetic characteristics of Zn<sub>0.8</sub>Co<sub>0.2</sub>Fe<sub>2</sub>O<sub>4</sub> spinel ferrite during the synthesis. However, the temperature-dependent properties of Zn<sub>0.8</sub>Co<sub>0.2</sub>Fe<sub>2</sub>O<sub>4</sub> were not sufficiently explored. Understanding the influence of temperature on cation distribution, crystallite size, and magnetic properties is crucial to optimize the material’s performance in many technological uses. This study explores the temperature-dependent characteristic of Zn<sub>0.8</sub>Co<sub>0.2</sub>Fe<sub>2</sub>O<sub>4</sub> ferrite to enhance its suitability for electronic and magnetic device applications. The sol-gel auto-combustion method was utilized for synthesizing Zn<sub>0.8</sub>Co<sub>0.2</sub>Fe<sub>2</sub>O<sub>4</sub> nano-ferrites, and then the temperature dependence of the structural property, cation distribution and magnetic behavior were explored. The X-ray patterns revealed that the crystallite size and lattice parameters increased by razing calcination temperature. The calculated crystallite sizes ranged from 23.78 nm to 38.02 nm, confirming the crystalline structure in the nm ranges of the prepared ferrite materials. Fourier transform infrared spectroscopy provides the formation of a cubic spinel structure with high-frequency (υ<sub>1</sub>) ranges between 534.3 and 549.61 cm<sup>−1</sup> and low-frequency bands (υ<sub>2</sub>) appearing between 348.8 and 389.53 cm<sup>−1</sup>. These frequency bands appeared due to the stretching vibration of metal-oxygen ions at both A-sites and B-sites. Field emission scanning electron microscopy showed that all calcined samples have almost spherical shapes with a high degree of agglomeration. Using a Vibration Sample Magnetometer, the magnetic property showed that the synthesized nano-ferrites have soft magnetization at ambient temperature. The magnetic saturation values decreased with calcination temperature starting at 18.225 emu/g to 7.702 emu/g from 400 °C to 600 °C, respectively. The magnetic moment reduced from 0.782 to 0.3306 with increasing calcination temperature due to particle growth at higher temperatures, leading to cation distribution between A and B sites and weakening of superexchange coupling.</p> Graphical Abstract <p></p>

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Synthesis and characterization of Zn0.8Co0.2Fe₂O₄ ferrite nanoparticles: Magnetic and structural insights

  • 期刊论文

  • 发表日期：

    2025年5月7日

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  • Hero S. Ahmed,
  • Sarkawt A. Hussen,
  • Ali M. Mohammad

摘要

Temperature variations highly influence the structural, cation redistribution and magnetic characteristics of Zn0.8Co0.2Fe2O4 spinel ferrite during the synthesis. However, the temperature-dependent properties of Zn0.8Co0.2Fe2O4 were not sufficiently explored. Understanding the influence of temperature on cation distribution, crystallite size, and magnetic properties is crucial to optimize the material’s performance in many technological uses. This study explores the temperature-dependent characteristic of Zn0.8Co0.2Fe2O4 ferrite to enhance its suitability for electronic and magnetic device applications. The sol-gel auto-combustion method was utilized for synthesizing Zn0.8Co0.2Fe2O4 nano-ferrites, and then the temperature dependence of the structural property, cation distribution and magnetic behavior were explored. The X-ray patterns revealed that the crystallite size and lattice parameters increased by razing calcination temperature. The calculated crystallite sizes ranged from 23.78 nm to 38.02 nm, confirming the crystalline structure in the nm ranges of the prepared ferrite materials. Fourier transform infrared spectroscopy provides the formation of a cubic spinel structure with high-frequency (υ1) ranges between 534.3 and 549.61 cm−1 and low-frequency bands (υ2) appearing between 348.8 and 389.53 cm−1. These frequency bands appeared due to the stretching vibration of metal-oxygen ions at both A-sites and B-sites. Field emission scanning electron microscopy showed that all calcined samples have almost spherical shapes with a high degree of agglomeration. Using a Vibration Sample Magnetometer, the magnetic property showed that the synthesized nano-ferrites have soft magnetization at ambient temperature. The magnetic saturation values decreased with calcination temperature starting at 18.225 emu/g to 7.702 emu/g from 400 °C to 600 °C, respectively. The magnetic moment reduced from 0.782 to 0.3306 with increasing calcination temperature due to particle growth at higher temperatures, leading to cation distribution between A and B sites and weakening of superexchange coupling.

Graphical Abstract