Study of the effect of La3+ doping on the properties of ceramics based on BaTiOx

Abstract

The paper presents results of the influence of doping with lanthanum (La3+) on structural, conductive properties and phase composition of ceramics based on barium titanate, obtained by solid-phase synthesis, followed by thermal annealing at 800 °C for 5 h. The study found that the doping of the structure of barium titanate with lanthanum leads to a change in the phase composition with the phase (Ba0.94La0.06) (TiO3) of the substitution solid solution and impurity inclusions of the anatase and BaTi2O5 phases dominating. In this case, the formation of the cubic phase (Ba0.94La0.06)(TiO3) leads to a slight change in the average particle size and a decrease in the dielectric constant, as well as a shift of the absorption edge. According to IVC measurement data, it was found that for doped La3+ structures, a significant decrease in the magnitude of amperage, and a change in shape of IVC loop are observed. The increase in resistance for doped structures is due to the formation of lanthanum containing particles in the structure, as well as the change in the geometric dimensions of particles, leading to changes in the dislocation density, which creates additional distortions and defects in the structure.