Analysis of the structural and magnetic properties of the system BaTi0.7Fe0.3O3 doped with Mn ions

Reference Presenter Authors
(Institution)
Abstract
08-065 Ricardo Augusto Mascarello Gotardo Gotardo, R.A.(Tecnological Federal University of Paraná); Silva, P.V.(Tecnological Federal University of Paraná); Rosso, J.M.(Universidade Estadual de Maringá); Cótica, L.F.(Maringa State University); Santos, I.A.(Maringa State University); Barium Titanate (BaTiO3) ceramics have been extensively explored for technological applications such as transducers, actuators, sensors, capacitors, permissivity thermistors and in memories applications. However, all the excellent properties of BaTiO3 are affected by many factors such as grain size, crystalline structure, purity, density, doping, and others. All of these factors can be directly controlled by the way the material is produced. The synthesis of this material involves complicated chemical procedure or the conventional solid-state reaction followed by heat treatment at high temperatures. The solid-state reaction is a simple and low cost preparation method, although it has the disadvantage of produce material with large average grain size. There is an increase in the research of multiferroic materials, where magnetism and ferroelectric polarization coexist in the same phase, due to their interesting physical properties and a wide range of potential applications. BaTiO3 can act as a multiferroic material with the induction of ferromagnetism by intentionally doping with transition metal ions such as Mn, Fe, Co, Ni and Cr. The solid-state reaction method was applied to obtain the BaTi0.7Fe0.3O3 powder system from the precursors BaCO3, TiO2 and Fe2O3, where the material was calcined at 1200 °C for 5 hours. After that, the system was doped with manganese, using the MnO2 precursor in samples with concentrations of Mn varying from 0.5 to 1.5%, the doped samples were calcined at 1200 ºC for 5 hours. Finally, X-ray diffractometry were carried to confirm the crystalline structure of the materials and magnetic hysteresis to verify the magnetic behavior of the samples. Our results points to the formation of single phase materials presenting a perovskite structure with hexagonal symmetry, also all the samples presented a magnetic behavior.
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