Effect of Mn substitutions on dielectric properties of high dielectric constant BaTiO3-based ceramic

The effects of Mn added during processing on the dielectric properties and microstructure of the BaTiO3-based ceramic materials system were discussed. Experiments show that a proper content of Mn can significantly increase dielectric constant (epsilon) and reduce the dielectric loss (tan delta) in BaTiO3-based X7R ceramic materials. The results attribute to the reaction: Mn4+ + 2Ti(3+) -> Mn2+ + 2Ti(4+). When the system doped with 0.046mol% MnCO3 was sintered at 1240 degrees C for 4 h, the epsilon tan delta and TCC were 5800, 1.6%, 0 +/- 10% at 1 KHz respectively.