The enhanced electrical and dielectric properties of cobalt-based spinel ferrites for high-frequency applications

The spinel ferrites are famous due to their unique electrical and magnetic performance. The composition Co1-xSrxFe2O4 (x = 0.00, 0.20, 0.40, 0.60, 0.80, and 1.0) was prepared by sol-gel technique. The pattern of X-ray diffraction (XRD) exhibited the cubic spinel phase of all samples. The values of the lattice constant are improved, whereas the porosity and densities are decreased by the substitution of strontium ions. The addition of strontium ions increased activation energy and dc resistivity. The increase in the strontium ions also created the decreasing trend in the temperature-dependent resistivity, which proved the semiconducting nature of spinel ferrites. The substitution of strontium ions enhanced the coercivity while magnetization decreased by changing the applied field. The dielectric parameters were also found in the frequency range of 3 Mega Hertz to 1 Giga Hertz. The low dielectric loss and enhanced value of direct current resistivity made such samples appropriate for high-frequency applications.