International Journal For Multidisciplinary Research

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Microwave Hydrothermal Synthesis and Electrical Characterization of Zn-Doped NiCo₂O₄ Spinel Oxide

Author(s) Dr. Satyanarayana Maheshwaram, Dr. Bandi Ashok, Dr. Ravinder Reddy Butreddy
Country India
Abstract Zn-doped nickel cobaltite (NiCo₂−xZnxO₄) nanoparticles with varying Zn concentrations were synthesized through a microwave-assisted hydrothermal method. The prepared samples were systematically characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and dielectric measurements. XRD analysis confirmed the formation of a single-phase cubic spinel structure without secondary impurity phases. FTIR studies revealed characteristic metal–oxygen vibrational bands associated with the spinel framework, while XPS analysis verified the oxidation states and successful incorporation of Zn ions into the NiCo₂O₄ lattice. The dielectric properties demonstrated strong frequency-dependent behavior, where the dielectric constant and dielectric loss decreased with increasing frequency due to interfacial polarization effects. AC conductivity increased progressively with frequency, indicating enhanced hopping conduction between mixed valence ions. The Zn-doped compositions exhibited improved electrical transport characteristics compared with un doped NiCo₂O₄. Among all compositions, the x = 0.08 sample showed superior conductivity and dielectric stability, suggesting its suitability for high-frequency electronic and energy-storage applications
Keywords Zn-substituted NiCo₂O₄, spinel oxide nanoparticles, microwave hydrothermal synthesis, dielectric behavior, AC conductivity, dielectric loss, frequency response, nanomaterials, electronic applications.
Field Physics > Energy
Published In Volume 8, Issue 3, May-June 2026
Published On 2026-05-22
DOI https://doi.org/10.36948/ijfmr.2026.v08i03.79152
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