Low sintering of X7R ceramics based on barium titanate with SiO2–B2O3–Li2O sintering additives in reducing atmosphere

Development of a low-temperature sintered dielectric material derived from barium titanate for X7R characterized dielectric ceramics application is discussed in this paper. By addition of SiO2–B2O3–Li2O sintering additives to commercial BaTiO3 powder, more than 95% of the theoretical density was obtained at a sintering temperature of 950 °C in H2/N2 atmosphere. The influence of the composition and procedures on the microstructures, lattice parameters and properties of ceramics materials were systemically studied. After explaining the reason for lower isolated resistivity (IR) in the previous experiment, several methods are tried out to improve the IR properties, which have reached the application requirement level of 1012 Ω cm. These ceramics sintered between 900 °C and 950 °C in H2/N2 atmosphere are promising candidates for fabrication of Cu electrode MLCCs.