Insight Into the Anomalous Electrical Behavior, Dielectric and Magnetic Study of Ag-Doped CoFe2O4Synthesised by Okra Extract-Assisted Green Synthesis

The effect of substitution of silver (Ag) on the structural, electric, dielectric and magnetic properties of nano-CoFe(2)O(4)synthesized via green synthesis using okra plant extract is investigated. The lattice parameters and inverse spinel structure of Ag-substituted CoFe(2)O(4)is confirmed from Rietveld refinement of the x-ray diffraction measurements, Fourier transform infrared (FT-IR) and Raman spectra. A lattice expansion is observed due to the incorporation of larger Ag ions into the CoFe(2)O(4)lattice. Field emission scanning electron micrography analyses elucidate the formation of poly-faceted surfaces with reduction in particle size on Ag doping. The temperature dependent impedance and modulus study reveals the presence of relaxation phenomenon which is dependent on frequency and temperature. Frequency dependent dielectric measurements with increasing temperature obey the modified Debye model. Dielectric loss in the negative region for Ag-doped CoFe(2)O(4)signifies the change of polarization direction due to an increase of Co2+/Fe2+ ratio for the substitution of Ag ions in the B site. Magnetic hysteresis curves exhibit a low field hysteresis loop at room temperature indicating the long-range ferromagnetic ordering nature of the samples. Low loss and high dielectric values make these materials a promising candidate for high frequency devices.