Abstract
Multilayer semiconducting (Ba, Ca)TiO3 ceramics having positive temperature coefficient of resistivity (PTCR) were fired in reducing-reoxidizing atmospheres using Ni–Pd alloys as internal electrodes. Nickel was added to palladium electrodes to form the ohmic contact between internal electrodes and ceramics. Samples were fired at 1350° C for 2 h in reducing atmospheres composed of H2 and N2 gases, and then were annealed for 2 h in reoxidizing atmospheres composed of O2 and N2 gases in the cooling process. The effects of firing atmosphere on voltage-current and PTCR characteristics were experimentally investigated.
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