Effect of Zn on Dielectric Properties of Co-ZnFe2O4 Magnetic Nanoparticles

Dielectric properties of Zn substituted cobalt ferrite (Co1-xZnxFe2O4) magnetic nanoparticles with various Zn concentrations (x = 0.2-0.8) have been successfully investigated. The structure of the prepared samples Co1-xZnxFe2O4 confirmed to be cubic spinel structure using X-ray diffraction analysis. The crystallite size of the sample was found to decrease with the increase of zinc content from 11.6 nm to 9.8 nm, while the lattice parameters found to increase with the increase of zinc from 8.18 to 8.25 Å. For Zinc x = 0.6 at frequency 5 kHz have the highest real dielectric constant (ɛ') was 678.8 and imaginary dielectric constant (ɛ'') was 833.3. The maximum impedance found at zinc x = 0.3 was 138.5. The dielectric constant decrease rapidly with increasing the frequency and then reaches the constant value where the frequency was used from 5-120 kHz.