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<p>Zinc substituted Nickel Copper ferrite ceramics (ZNC) having the general&#xa0;formula Ni <sub>(0.7-x)</sub> Cu<sub>0.3</sub>Zn<sub>x</sub>Fe<sub>2</sub>O<sub>4</sub> (<i>x</i> = 0.0, 0.1, 0.2 and 0.3) were synthesized using citrate precursor auto combustion method. Prepared samples were calcined at 550&#xa0;℃ using microwave furnace for 30&#xa0;min with a ramp rate of 10&#xa0;°C/min. The calcined samples were then pressed into pellets using PVA as a binder and sintered at 600&#xa0;℃ in a microwave furnace for 30&#xa0;min with the same heating rate. Sintered samples were analysed for structural, morphological, dielectric, and magnetic properties using XRD, FTIR, FESEM, LCR meter, and VSM, respectively. Further, x-ray diffractogram confirmed the cubic spinel phase of all the samples. Thereby, obtained the average crystallite size, lattice constant and x-ray density. The average crystallite size value ranges from ~ 40.15&#xa0;nm to ~ 58.72&#xa0;nm. Lattice expansion accompanied by a decrease in density due to volumetric expansion was observed. Besides, in support of XRD, FTIR spectroscopy demonstrates existence of M–O bond in octahedral and tetrahedral sites of ZNC samples. Furthermore, dielectric properties of ZNC&#xa0;samples, including dielectric constant, dielectric loss, and AC conductivity, were investigated at room temperature over the frequency range of 20&#xa0;Hz to 2&#xa0;MHz. The dielectric constant and loss exhibited the typical dispersive behaviour of ferrites. The dependence of dielectric constant, dielectric loss, and AC conductivity on composition was specifically examined at 10&#xa0;kHz. Moreover, magnetic properties namely saturation magnetization, remanent magnetization, coercivity and squareness ratio were examined with varying Zn<sup>2</sup>⁺ concentration&#xa0;using VSM. The mechanisms underlying the observed results were discussed.</p>

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Zinc substituted nickel-copper ferrite ceramics: A study on structural, dielectric and magnetic properties

  • 期刊论文

  • 发表日期：

    2026年5月27日

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  • Susmita Salam,
  • Anannya Sarmah,
  • Ibetombi Soibam

摘要

Zinc substituted Nickel Copper ferrite ceramics (ZNC) having the general formula Ni (0.7-x) Cu0.3ZnxFe2O4 (x = 0.0, 0.1, 0.2 and 0.3) were synthesized using citrate precursor auto combustion method. Prepared samples were calcined at 550 ℃ using microwave furnace for 30 min with a ramp rate of 10 °C/min. The calcined samples were then pressed into pellets using PVA as a binder and sintered at 600 ℃ in a microwave furnace for 30 min with the same heating rate. Sintered samples were analysed for structural, morphological, dielectric, and magnetic properties using XRD, FTIR, FESEM, LCR meter, and VSM, respectively. Further, x-ray diffractogram confirmed the cubic spinel phase of all the samples. Thereby, obtained the average crystallite size, lattice constant and x-ray density. The average crystallite size value ranges from ~ 40.15 nm to ~ 58.72 nm. Lattice expansion accompanied by a decrease in density due to volumetric expansion was observed. Besides, in support of XRD, FTIR spectroscopy demonstrates existence of M–O bond in octahedral and tetrahedral sites of ZNC samples. Furthermore, dielectric properties of ZNC samples, including dielectric constant, dielectric loss, and AC conductivity, were investigated at room temperature over the frequency range of 20 Hz to 2 MHz. The dielectric constant and loss exhibited the typical dispersive behaviour of ferrites. The dependence of dielectric constant, dielectric loss, and AC conductivity on composition was specifically examined at 10 kHz. Moreover, magnetic properties namely saturation magnetization, remanent magnetization, coercivity and squareness ratio were examined with varying Zn2⁺ concentration using VSM. The mechanisms underlying the observed results were discussed.