A study on structural, optical, and magnetic properties of MgFe2O4-BaTiO3 nanocomposites

In this work, the samples of MgFe2O4 (MFO)(x)-BaTiO3 (BTO)((100-x)) (x = 10, 20, 30, 40, 50) are synthesized by a sol-gel process. According to the X-ray diffraction data, all composites have the tetragonal phase for BTO, and the spinel phase for MFO. In accordance with FESEM, the ferrite particles become more agglomerated, and have an irregular shape as the MgFe2O4 concentration increases. The hysteresis loops (M-H) measured at room temperature indicates an increase in the saturation magnetization with an increase in the MFO content. The band gap dependency on the MFO content is also studied using the UV-visible spectra, which show that the band gap energies are in the range of 2.17-2.70 eV. With an increase in MFO, the dielectric constant decreases, and the dielectric tangent loss increases. Also according to the Nyquist plots, as the MFO phase increases in the composites, the diameter of the semicircle also increase indicating the higher resistivity.