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<p>The structural and electrical properties of NiFe<sub>2</sub>O<sub>4</sub>–CdO nanocomposites synthesized via a solid-state route were investigated. X-ray diffraction (XRD) indicates the formation of a biphasic system comprising cubic spinel NiFe<sub>2</sub>O<sub>4</sub> and cubic CdO without secondary phases. SEM and EDX analyses reveal uniform distribution of CdO within the ferrite matrix. The composite exhibits enhanced electrical conductivity (3.4 × 10<sup>−4</sup> S cm<sup>−1</sup>), attributed to interfacial polarization and defect-assisted hopping conduction. Frequency-dependent AC conductivity follows Jonscher’s power law, indicating a transition from DC plateau to dispersive transport. Dielectric analysis shows Maxwell–Wagner-type polarization with reduced dielectric loss at higher frequencies. Electric modulus studies confirm defect-mediated relaxation processes. The improved electrical response is attributed to increased heterointerfacial density and charge carrier dynamics. These results suggest that NiFe<sub>2</sub>O<sub>4</sub>–CdO composites are promising candidates for high-frequency dielectric and impedance-based electronic applications.</p>

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Electrical and structural properties of nickel ferrite–cadmium oxide composite at room temperature

  • 期刊论文

  • 发表日期：

    2026年4月10日

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  • Anil Kumar Nagendra Reddy,
  • Rajprakash Halappa Gowdru,
  • Kotresh Savanur,
  • Umapathy Ganjikatte Ramachandrappa,
  • Harish Venkatareddy,
  • Bhagyalakhi Barua,
  • Chethan Basavalingappa

摘要

The structural and electrical properties of NiFe2O4–CdO nanocomposites synthesized via a solid-state route were investigated. X-ray diffraction (XRD) indicates the formation of a biphasic system comprising cubic spinel NiFe2O4 and cubic CdO without secondary phases. SEM and EDX analyses reveal uniform distribution of CdO within the ferrite matrix. The composite exhibits enhanced electrical conductivity (3.4 × 10−4 S cm−1), attributed to interfacial polarization and defect-assisted hopping conduction. Frequency-dependent AC conductivity follows Jonscher’s power law, indicating a transition from DC plateau to dispersive transport. Dielectric analysis shows Maxwell–Wagner-type polarization with reduced dielectric loss at higher frequencies. Electric modulus studies confirm defect-mediated relaxation processes. The improved electrical response is attributed to increased heterointerfacial density and charge carrier dynamics. These results suggest that NiFe2O4–CdO composites are promising candidates for high-frequency dielectric and impedance-based electronic applications.