Structure, magnetic and complex impedance analysis of (1-x)BaTiO₃- xMgFe₂O₄ composite

MgFe₂O₄ was synthesized by using sol-gel auto-combustion technique and coupled with BaTiO₃ using the conventional solid state reaction method with different weight fraction of x = 0.00, 0.02, 0.04, 0.06 and 0.08 to form (1-x)BaTiO₃ - xMgFe₂O₄ composite. The structure, magnetic properties and complex impedance analysis of the composite samples were studied using X-ray diffraction technique (XRD), scanning electron microscopy (SEM) and vibrating sample magnetometer (VSM) and High-frequency response analyzer (HFRA) respectively. XRD patterns showed a single phase tetragonal BaTiO₃ for each composition due to the very small amount of MgFe₂O₄. The hysteresis loop confirmed that the composite has soft magnetic properties by addition of MgFe₂O₄. Small coercive field, HC has been recorded and it decreased with the increasing of MgFe₂O₄ weight fraction. However, magnetization increased when the amount of MgFe₂O₄ is increased. Impedance analysis conducted in range of 0.1 Hz to 10 MHz showed two depressed semicircle arcs for samples with MgFe₂O₄ due to the resistive and capacitive behavior of the bulk and grain boundaries of the samples