Papers by Keyword: Ba_0.7Sr_0.3TiO₃

Abstract: Perovskite Ba_0.7Sr_0.3TiO₃ nanocubes with a hollow structure were prepared by molten hydrated salt method at 180 °C for 15 h, using Ba (OH)₂·8H₂O, Sr (OH)₂·8H₂O and anatase-TiO₂ as raw materials without any additive or template. The phase composition, morphology and microstructure of the products were characterized by XRD, SEM, TEM and HRTEM. The XRD result indicates that the products are phase pure cubic Ba_0.7Sr_0.3TiO₃, with the calculated unit cell a=0.3965 nm. The SEM, TEM and HRTEM results show that the products with polycrystalline structure are composed of the hollow nanocubes whose average edge length is about 180 nm, and their morphologies are greatly influenced by reaction temperature and reaction time. In addition, the formation mechanism of the hollow nanocubes also was discussed.

Abstract: In this work, tape-casting technique was employed to prepare Ba0.7Sr0.3TiO3 films for lens antenna system. Effects of slurry properties on the tape casting procedure were investigated and the thickness, tensile strength and the surface roughness of the tapes were studied. The structure, morphology and the dielectric properties of the films were analyzed.