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Cost-effective and controllable synthesis of M0.25Ni0.15Cu0.25Co0.35Fe2O4 (M 2+ = Mg 2+ , Mn 2+ , and Cd 2+ ) ferrites via the sol-gel auto-combustion technique. The impact of divalent cations on the structural, dielectric, optoelectrical properties of ferrites was examined by XRD, FTIR, Raman, LCR, UV-vis, and two probe I-V measurement techniques. The crystallite size was 52.66 nm and the minimum specific surface area was observed 5.1507 m 2 /g for Mg 2+ doped NCCF ferrite. The FTIR and Raman analysis also confirmed the substitution of divalent cations (M 2+ = Mg 2+ , Mn 2+ , and Cd 2+ ) at their respective lattice sites. The maximum energy bandgap was 1.67 eV Mg 2+ doped NCCF ferrite as compared to other divalent ion-doped ferrites. The dielectric loss decreased while the ac conductivity increased with increasing frequency and the minimum values were observed for Mg 2+ doped NCCF ferrite. The activation energy was observed maximum for Mg 2+ doped NCCF ferrite (0.2234 eV). Due to incredible properties including small specific surface area, large energy band gap, high resistivity and loss dielectric loss of Mg 2+ doped NCCF ferrite have potential applications in different fields.

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