Influence of annealing on the structure and ferroelectric properties of Sr0.13Na0.37Bi0.50TiO3 thin films prepared by metalorganic solution deposition

Sr0.13Na0.37Bi0.50TiO3 thin films were prepared by metalorganic solution deposition, and annealed at temperatures from 550 to 700 °C for 1–15 min. The influence of annealing on the morphology, phase and ferroelectric properties was studied by scanning electron microscopy, X-ray diffraction and ferroelectric analyzer. The doping of Na0.50Bi0.50TiO3 films with Sr results in the existence of two phases, i. e., Na0.5Bi0.5TiO3-like (matrix) phase and BiTiO3-like (second) phase, the relative contents of which depend on the annealing conditions. With the increase of annealing temperature and prolongation of annealing time, the phase content of the BiTiO3-like second phase increases and a phenocryst structure was formed, which leads to the decrease of remnant polarization of Sr0.13Na0.37Bi0.50TiO3 thin films.