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<p>A series of soft magnetic electroceramics with the general formula Co<sub>0.8</sub>Ni<sub><i>x</i></sub>Cu<sub>0.2−<i>x</i></sub>Fe<sub>2</sub>O<sub>4</sub> (<i>x</i> = 0.00, 0.10, and 0.20) were successfully synthesized via the sol–gel auto-combustion method, and their structural, morphological, magnetic, dielectric, and electrochemical properties were systematically investigated. X-ray diffraction confirmed the formation of a single-phase cubic spinel structure in all samples, while Fourier transform infrared (FTIR) spectroscopy further supported the presence of spinel-type bonds. Scanning electron microscopy revealed porous and agglomerated grain morphologies, and energy-dispersive X-ray (EDX) spectroscopy verified the elemental purity and stoichiometry of the synthesized ceramics. X-ray photoelectron spectroscopy was employed to analyze cation distribution and oxidation states within the spinel lattice. Magnetic properties were evaluated using a vibrating sample magnetometer, and dielectric behavior was examined using an LCR meter across the frequency range of 1&#xa0;Hz to 10&#xa0;MHz at room temperature. Electrochemical impedance spectroscopy measurements were performed using a potentiostat galvanostat equipped with a frequency response analyzer, providing insights into charge transfer and ion diffusion behavior. Among the studied compositions, Co<sub>0.8</sub>Ni<sub>0.1</sub>Cu<sub>0.1</sub>Fe<sub>2</sub>O<sub>4</sub> exhibited the most favorable combination of magnetic softness, high dielectric constant, low dielectric loss, and characteristic Warburg-type impedance response, indicating efficient ion transport and capacitive behavior. These results highlight its potential as a multifunctional electro ceramic material suitable for use in energy storage devices.</p> Graphical abstract <p></p>

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Comparative investigation of structural, magnetic, and dielectric properties of Co0.8NixCu0.2−XFe2O4 (x = 0.00, 0.10 and 0.20) soft magnet electroceramics

  • 期刊论文

  • 发表日期：

    2025年9月27日

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  • Fereshteh Mozardzadeh,
  • Alireza Salehirad,
  • Sayed Ahmad Mozaffari

摘要

A series of soft magnetic electroceramics with the general formula Co0.8NixCu0.2−xFe2O4 (x = 0.00, 0.10, and 0.20) were successfully synthesized via the sol–gel auto-combustion method, and their structural, morphological, magnetic, dielectric, and electrochemical properties were systematically investigated. X-ray diffraction confirmed the formation of a single-phase cubic spinel structure in all samples, while Fourier transform infrared (FTIR) spectroscopy further supported the presence of spinel-type bonds. Scanning electron microscopy revealed porous and agglomerated grain morphologies, and energy-dispersive X-ray (EDX) spectroscopy verified the elemental purity and stoichiometry of the synthesized ceramics. X-ray photoelectron spectroscopy was employed to analyze cation distribution and oxidation states within the spinel lattice. Magnetic properties were evaluated using a vibrating sample magnetometer, and dielectric behavior was examined using an LCR meter across the frequency range of 1 Hz to 10 MHz at room temperature. Electrochemical impedance spectroscopy measurements were performed using a potentiostat galvanostat equipped with a frequency response analyzer, providing insights into charge transfer and ion diffusion behavior. Among the studied compositions, Co0.8Ni0.1Cu0.1Fe2O4 exhibited the most favorable combination of magnetic softness, high dielectric constant, low dielectric loss, and characteristic Warburg-type impedance response, indicating efficient ion transport and capacitive behavior. These results highlight its potential as a multifunctional electro ceramic material suitable for use in energy storage devices.

Graphical abstract