Syenthis, structural, magnetic, optical, and dielectric properties of ag and cr substituted Co-ferrite nanoparticles

The co-precipitation method was used to synthesize Co_1-2xAg_xCr_xFe₂O₄, Co-ferrite doped with Ag and Cr (where x = 0.0, 0.02, 0.04, 0.06, 0.08, and 1). The obtained samples' single phase of the cubic spinel structure was confirmed by XRD analysis. The crystallites in the samples ranged in size from 11 to 18 nm. XPS analysis of the prepared samples verified the existence of many equivalents of metallic ions. TEM images displayed the nanocrystalline nature of the prepared samples and gave an estimation of their size and shape. The vibrational stretching of tetrahedral and octahedral complexes is the cause of two absorption bands that are revealed by FTIR spectroscopy even after Ag and Cr replacement. The magnetic properties of the VSM data indicate that the saturation magnetization decreases as the Cr and Ag levels rise. All of the produced samples have low band gap energy values according to UV-vis absorbance spectroscopy, which makes them attractive candidates for catalytic applications. Between 10 Hz and 10 MHz, the produced nanoparticles show dielectric characteristics. As the frequency increases, the dielectric readings decrease, but the ac conductivity shows the opposite pattern. As the frequency goes up, the Tanδ values go down a little until they reach very low levels, while the ε' values get closer to a steady value. This implies the possibility of creating radio frequency-dependent electronics using a low-loss and low-permittivity dielectric substrate.