Effects of Sintering Temperature and Annealing in N2Atmosphere on the Dielectric Properties of BaTio3Based X7R Dielectric Materials

Two commercial BaTiO3 based powders were selected, characterized and used for the fabrication of X7R dielectric ceramics. The effects of forming and sintering on the dielectric properties have been studied and processing parameters optimized. The annealing treatment in N2 atmosphere has been used in order to modify the dielectric properties of BaTiO3. The related dielectric properties have been tested and microstructures of BaTiO3 ceramics examined. The results show that by combining the optimized processing parameters such as cold isostatic pressure 225 MPa, sintering temperature from 1300 to 1400 °C and annealing treatment at 850 °C, a marked increase in dielectric constant from approximately 3000 to 3600 has been achieved with the commercial BaTiO3 based powder. This was accomplished while keeping the X7R capacitor requirements on the dissipation factor (