Thermal Analysis and Magnetic Properties of Lanthanum Barium Manganite Perovskite

Abstract

The lanthanum manganite is the family of magnetic materials which had the magnetic properties are varied depend on the composition. This study has been carried out synthesis and characterization of thermal and magnetic properties of the lanthanum barium manganite perovskite. The perovskite material is prepared by oxides, namely La2O3, BaCO3, and MnCO3. The mixture was milled for 10h and then sintered at temperature of 1000 °C for 10h. Thermal analysis and magnetic properties are measured by differential thermal analysis (TG-DTA) and vibrating sample magnetometer (VSM), respectively. Decomposition phase of MnCO3 become MnO occurred at temperatures around 390 °C with releasing in CO2. Since lanthanum manganite has a stable ion configuration, magnetic properties of these systems are built from MnO phase transformation become α-Mn2O3 is arrayed anti-ferromagnetic due to the presence of lanthanum in the system. And this anti-ferromagnetic behavior occurred due to magnetic interactions between Mn3+ adjacent ions through super-exchange mechanism. While lanthanum barium manganite had a less stable ion configuration, therefore magnetic properties of these systems are built from phase transformation MnO become α-Mn3O4 is arrayed ferromagnetic due to the presence of lanthanum and barium in this system. The presence of lanthanum and barium trigger in the emergence of mixed-valence Mn ions, so that occur to magnetic interaction between Mn3+ and Mn4+ through the double-exchange mechanism. We concluded that the characteristic of magnetic properties on the lanthanum barium manganite system perovskite is affected by thermal properties, fundamental properties of raw material and the result of reaction is formed.