Gebru Zerihun

Investigation of A-site La substituted BaTi0.96Mn0.04O3 ceramics: Searching for ferromagnetic origin

Ba1-xLaxTi0.96Mn0.04O3 ceramics (x = 0, 3%, 7%) were prepared by a modified Pechini method and the structure, morphology, magnetic and electric properties have been investigated. X-ray diffraction analysis reveals La3+ ions could suppress the formation of hexagonal phase effectively. The cell parameter c decreases firstly and then increases with the increase of La content, which indicates that La ions have been incorporated into the lattice of BaTi0.96Mn0.04O3, and that Mn ions transform from high valence to low valence. The magnetization, polarization and leakage currents are also influenced by La doping greatly. Detailed analysis of magnetic variation with structural change attributes the room temperature ferromagnetism to double exchange interactions between Mn3+ and Mn4+ ions.