Crystal chemistry and electrical properties of La-doped BaTiO3

Abstract

The effect of lanthanum doping with different concentrations of lanthanum to dope with barium titanate (BaTiO3) was studied. All the samples of Ba1-xLaxTiO3 with x = 0, 0.0005, 0.0010 and 0.0030 are prepared through the conventional solid-state reaction. XRD is used to determine the purity and to evaluate crystal chemistry of the prepared samples. Impedance spectroscopy analysis is used to analyse the impedance data of the Ba1-xLaxTiO3 and study the changes with different concentration of lanthanum doped after the samples are sintered at 1450°C for 4 hours. From the results, the dielectric constant is frequency-dependent where the higher the frequency, the lower the dielectric constant, and the Curie temperature, Tc is decreased from 393 K to 383K by increasing the dopant concentration of lanthanum into BaTiO3.