Effects of La_(0.5)Sr_(0.5)CoO3 sol concentration on the microstructure and dielectric properties of Ba_(0.6)Sr_(0.4)TiO3 films prepared by sol-gel method on Ti substrate

摘要

Ba_(0.6)Sr_(0.4)TiO3 (EST) thin films were deposited on La_(0.5)Sr_(0.5)CoO3 ( LSCO ) buffered Ti substrates. Both BST and LSCO were prepared by sol-gel method. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis were used to investigate the effect of LSCO sol concentration on the crystallinity and surface morphology of the films. The results show that with the increase of LSCO sol concentration, BST films show variation of the structure and dielectric properties. BST films for LSCO of 0.2 mol/L exhibit a better crystallinity and improved dielectric properties, with the tunability, dielectric constant and tanδ of 30%, 420 and 0.028 respectively.