Electrical properties of Y- and Mn-doped BaTiO3-based PTC ceramics

A series of nano-Ba0.85−xYxSr0.07Ca0.08MnyTi1−yO3 (0.7% ≤ x ≤ 1.2%, 0% ≤ y ≤ 0.06%) solid solutions have been synthesized by solid-state reaction at low temperature. The experiment of doping different content Y and Mn shows that the room-temperature resistance decreases by doping Y, and the resistance jump increases dramatically by doping Mn. The optimum donor level increases significantly with increasing acceptor level. The room-temperature resistance changes as a U-type curve with an increase of Mn additive concentration while the resistance jump is on the reverse. Meanwhile, the influence of sintering temperature and soaking time on property of PTC materials was discussed.