Novel tin-doped BaTiO3 ceramics with non-reducibility and colossal dielectric constant

Novel BaTiO3-based ceramics with non-reducibility and colossal dielectric constant were successfully synthesized by conventional solid-state route through the doping of Sn ions. Electrical measurements indicate that the Sn-doped BaTiO3 ceramics show excellent dielectric and non-reductive properties. Compared with the Sn-doped BaTiO3 ceramics sintered in air, the dielectric constant, loss tangent and insulation resistance almost have no change for the samples sintered in H2-N2. The Sn-doped BaTiO3 ceramics sintered in H2-N2 show a colossal dielectric constant (1.2 × 104@1 kHz), low loss tangent (∼1.0% at 1 kHz), and acceptable insulation resistance (4.5 × 1010 Ω·cm). The mechanisms of anti-reduction and colossal dielectric constant are proposed.