Hydrothermal growth of textured Ba_xSr_(1-x)TiO3 films composed of nanowires

摘要

A novel method for synthesis of Barium Strontium Titanate (BST) films with a high degree of texture is developed with a two-step hydrothermal reaction and without the need for costly equipment/The dielectric constant and ferroelectric properties of the film can be tuned by varying the Ba : Sr molar ratio of the materials. The maximum ambient temperature dielectric constant of these BST films can reach 811 when the Ba molar fraction ("x" in Ba_xSr_(1-x)TiO3) is 0.71, which corresponds with the tetragonal to cubic phase transition of the solid solution. The ferroelectric behavior of the Ba_(0.91)Sr_(0.09)TiO3 film is confirmed by atomic force microscopy (AFM).