Green synthesis, structural, magnetic, and dielectric characterization of NiZnFe2O4/C nanocomposite

Nanocrystalline ferrite samples having matrix Ni1-xZnxFe2O4 (x=0.0, 0.1, 0.3, 0.5 and 0.7) synthesized by low- temperature self-combustion route using a complexing agent commercial bovine gelatin without any heat treatment. The morphological, magnetic, structural, and dielectrical properties of NiZnFe2O4/C nanocomposite have beenanalyzed. Those XRD analyses of theprepared ferritesamples illustrated pure single cubic spinel structure. The XRD parameters, viz average crystal size, lattice parameter, and density were deduced from XRD data. FTIR spectra revealed two conspicuous absorption bands, the higher band at tetrahedral (A) site and the lower band in octahedral (B) site. FE-SEM image for sample withx=0.5 confirmed the appearance of carbon, also TEM image confirmed the nano-sized particles that agglomerated due to magneto-static interaction between particles and showed carbon dots with average size of 5nm. The electron diffraction of selected area demonstrated the formation of single cubic spinel structure in consentient with XRD results. The nanocrystal of composition Ni0.9Zn0.1Fe2O4 has the maximum M-s=101.09emu/g as evinced in VSM measurements. The dielectric analysis showed that thedispersion of relative permittivity (epsilon) is most extreme for the Ni0.5Zn0.5Fe2O4 sample.