Dielectric and electrical properties of La0.5Ba0.5MnO3 and La0.97Ba0.03MnO3 perovskites

Abstract

In this work, the dielectric and electrical properties of the complex oxides La_0.5Ba_0.5MnO₃ and La_0.97Ba_0.03MnO₃ were studied. The studies were carried out at a temperature T = 25–225 °C and a frequency f = 20–10⁶ Hz ranges. For these compounds, the values of physical parameters (dielectric constant, dielectric losses, dielectric constant and electrical conductivity) characterizing dielectric and electrical properties are determined. From the temperature and frequency dependence of the parameters, it was established that with increasing temperature and frequency, the value of electrical conductivity in these compounds increases. A semiconductor–metal phase transition was detected in this compound at a temperature T ~ 140 °C. Oxide materials are used in a variety of processes due to their interesting chemical properties. It is known that in the process of condensation of methane with oxygen, along with ethane and ethylene, heavy hydrocarbons are also obtained. Nd₂O₃/MgO, La₂O₃/MgO, oxides of alkali and alkaline earth metals, as well as PbO oxide are used as catalysts for this process. Recently, BaSnO₃ and MnTiO₃ compounds with a perovskite structure have been used as catalysts in these processes. Therefore, it is very important to obtain new perovskite materials and study their physical and chemical properties.