STRUCTURAL, ELECTRICAL AND OPTICAL PROPERTIES OF (1-x)BiFeO3-xBaTiO3
Structural, Electrical and Optical properties of (1 - x)BiFeO3-xBaTiO3 (BFO–BT) solid solutions have been studied as a function of BT content (x = 0.23,0.25, 0.27, and 0.30). The phase purity and crystal lattice symmetry were estimated from X-ray diffraction studies, which undergo gradual, well-controlled structural transformations from rhombohedral to cubic structure with morphotropic phase boundary (MPB). The calculated values of the direct band gap of the (1-x)BiFeO3-xBaTiO3 ceramics were found to be 1.630, 1.77, 1.58and 1.59eV for x=0.23, 0.25, 0.27 and 0.3 respectively. The band gap energy of system was found to be less than the other reported value. The remnant polarization (Pr) values for x=0.23, 0.25, 0.27, 0.3 are 3.56, 1.86, 3.16 and 1.48 microC/cm2 respectively. In the meantime coercive field (Ec) for x=0.23, 0.25, 0.27 and 0.3 given by 1.72, 3.39, 3.76 and 4.06 kV/cm respectively.
Keywords: multiferroics, BFO-BT system, solid state reaction method, XRD, DRS, Morphotropic phase boundary