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<p>In this study, magnesium-zinc ferrite (Mg<sub>0.5</sub>Zn<sub>0.5</sub>Fe<sub>2</sub>O<sub>4</sub>) nanoparticles were successfully synthesized via a PVP-assisted co-precipitation method, followed by thermal annealing at temperatures ranging from 600&#xa0;°C to 1000&#xa0;°C. The influence of annealing temperature on the structural, morphological, magnetic, electrical, and electrochemical properties was systematically investigated. Rietveld refinement of X-ray diffraction (XRD) data confirmed the formation of a single-phase cubic spinel structure, with the average crystallite size increasing from 9.2&#xa0;nm to 34.8&#xa0;nm as a function of thermal treatment. Fourier Transform Infrared (FTIR) spectroscopy corroborated the structural integrity of the ferrite phase, revealing characteristic metal-oxygen absorption bands while indicating a thermally induced redistribution of cations. Morphological analysis via SEM and Dynamic Light Scattering (DLS) demonstrated progressive grain densification and strong secondary magnetic agglomeration, with hydrodynamic diameters expanding from ~ 3.08&#xa0;μm to ~ 7.41&#xa0;μm at elevated temperatures. Magnetic measurements using a Vibrating Sample Magnetometer (VSM) revealed a transition towards soft magnetic behavior, characterized by a significant reduction in coercivity (Hc) to 45.88 Oe and an optimization of saturation magnetization (Ms) from 1.23 emu/g to 19.08 emu/g at 900&#xa0;°C. Complex Impedance Spectroscopy (CIS) showed a systematic reduction in overall electrical resistance to 8994.5 Ω at 1000&#xa0;°C due to enhanced grain growth. Furthermore, electrochemical analysis via Cyclic Voltammetry (CV) indicated that the robust crystallinity achieved at higher annealing temperatures significantly improves charge storage, reaching a maximum specific capacitance of 7.68&#xa0;F/g. These findings suggest that thermally tuned Mg<sub>0.5</sub>Zn<sub>0.5</sub>Fe<sub>2</sub>O<sub>4</sub> nanoparticles possess highly tunable dual-functionality, making them promising candidates for high-frequency soft magnetic devices and pseudocapacitive energy storage systems.</p>

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Enhanced Magnetic Softness and Specific Capacitance in Mg0.5Zn0.5Fe2O4 Nanoferrites

  • 期刊论文

  • 发表日期：

    2026年3月26日

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  • S. Meena Sankari,
  • R. Sagayaraj,
  • S. Sebastian,
  • A. Amalorpavadoss,
  • V. Porkalai,
  • S. Aravazhi,
  • G. Chandrasekaran

摘要

In this study, magnesium-zinc ferrite (Mg0.5Zn0.5Fe2O4) nanoparticles were successfully synthesized via a PVP-assisted co-precipitation method, followed by thermal annealing at temperatures ranging from 600 °C to 1000 °C. The influence of annealing temperature on the structural, morphological, magnetic, electrical, and electrochemical properties was systematically investigated. Rietveld refinement of X-ray diffraction (XRD) data confirmed the formation of a single-phase cubic spinel structure, with the average crystallite size increasing from 9.2 nm to 34.8 nm as a function of thermal treatment. Fourier Transform Infrared (FTIR) spectroscopy corroborated the structural integrity of the ferrite phase, revealing characteristic metal-oxygen absorption bands while indicating a thermally induced redistribution of cations. Morphological analysis via SEM and Dynamic Light Scattering (DLS) demonstrated progressive grain densification and strong secondary magnetic agglomeration, with hydrodynamic diameters expanding from ~ 3.08 μm to ~ 7.41 μm at elevated temperatures. Magnetic measurements using a Vibrating Sample Magnetometer (VSM) revealed a transition towards soft magnetic behavior, characterized by a significant reduction in coercivity (Hc) to 45.88 Oe and an optimization of saturation magnetization (Ms) from 1.23 emu/g to 19.08 emu/g at 900 °C. Complex Impedance Spectroscopy (CIS) showed a systematic reduction in overall electrical resistance to 8994.5 Ω at 1000 °C due to enhanced grain growth. Furthermore, electrochemical analysis via Cyclic Voltammetry (CV) indicated that the robust crystallinity achieved at higher annealing temperatures significantly improves charge storage, reaching a maximum specific capacitance of 7.68 F/g. These findings suggest that thermally tuned Mg0.5Zn0.5Fe2O4 nanoparticles possess highly tunable dual-functionality, making them promising candidates for high-frequency soft magnetic devices and pseudocapacitive energy storage systems.