Studies on structural, dielectric, conductivity, magnetic and magneto-electric properties of barium titanate doped with lithium ferrite

In this paper, we report the synthesis of a multiferroic composite BaTiO3 (BT) doped with Li0.5Fe2.5O4 (LF) having chemical formulae (1-x) BaTiO3+ (x) Li0.5Fe2.5O4 (x = 0, 0.05, 0.1, 0.15) using conventional solid state reaction method. We have focused on the structural and multiferroic properties of LF doped BT. We have characterized the grown composites by XRD, FESEM with EDAX, Piezoelectric coefficient, dielectric studies, A.C conductivity studies, magnetic properties and magneto-electric (ME) voltage coefficient. The XRD studies reveal the tetragonal nature of all composites. We have calculated the lattice parameters and the crystallite size from XRD pattern. The XRD patterns of all composites exhibit diphasic nature. The dielectric constant of all composites decreases steeply with an increase in the frequency and attains a nearly constant value in the high-frequency region. The variation of conductivity with the frequency reveals that at high-frequency region, the maximum conductivity decreases with an increase in the % of LF. The variation of conductivity with temperature reveals that the Curie temperature of the composite decreases as and when the % of LF is increased in BT. We have also studied the temperature dependence of the magnetization and the variation of the magneto-electric voltage coefficient (ME) with a magnetic field. The transition temperature and Neel temperature of all composites increased with increase in LF. The Magneto-electric (ME) coefficient of composites decreased with increase LF content.