Enhancement of dielectric properties by addition of Li-Ti-Si-0 nanocomposite to X7R ceramics

摘要

BaTiO_3-based X7R dielectric materials were obtained by sintering with addition of nano-size 2Li_2O-TiO_2-SiO_2 (LTSO), which was synthesized using a sol-gel method, and showed high activity and great dis persion property. Both the pH value and calcination temperature had significant effects on LTSO particle size. The minimum particle size (～10 nm) was obtained by performing the sol-gel reaction at a pH of ～4 followed by further calcination at 550 °C. Moreover, the dielectric property of the ceramics was influ enced by the LTSO content and sintering temperature. A high dielectric property (5172) was obtained from BaTiO_3-based ceramics with 0.24 mol% LTSO nanocomposite sintered at 1280 °C, which met the requirements of EIA X7R specifications.