Effect of concentration on lattice strain, dielectric properties and activation energy of CoFe 2 O 4 /BaTiO 3 nanocomposites

The aim of this work was to develop the better combination of CoFe2O4 (CFO) and BaTiO3 (BTO) nanoparticles with enhanced dielectric properties. For this purpose, CFO/BTO nanocomposites at (0, 20, 40, 60, 80, and 100) wt% were synthesized using solid state method. The structural, optical and dielectric properties were investigated using the X-ray diffractometer, UV–Vis spectroscopy, and LCR meter respectively. The crystallite sizes of CFO and BTO were found to be 5.6 nm and 36.2 nm, respectively, by Scherrer’s formula. The uniform and nonuniform strains were determined using Hall method. The absorption edge and energy band gap were estimated from UV-B to visible range. The FESEM and EDX were used to confirm the crystallite size and pure formation of CFO/BTO nanocomposites with different concentration of BTO. The dielectric constant, dissipation factor and activation energy were observed higher for 20 wt% BTO as compared with other wt%, which is optimum combination of CFO/BTO nanocomposites.