Abstract
Influence of Ti/Ba ratio on the positive temperature coefficient resistance characteristics of Mn-doped semiconducting ceramics of (Ba0.997La0.003)(Ti x − y Mn y )O3 (0.97 ≤ x ≤ 1.02, 0.0003 ≤ y ≤ 0.0008) sintered in reducing atmosphere of N2 and reoxidized in an atmosphere with low oxygen partial pressure were investigated. The grain size of BaTiO3 ceramics strongly depends on A/B molar ratio because liquid phase promotes grain growth during sintering. The results show that semiconducting BaTiO3 ceramics fired in a reducing atmosphere and reoxidized at a low temperature of 850°C in air show better PTCR characteristics. However, Mn-doped BaTiO3 ceramics with (Ti + Mn/Ba + La) = 1.01 exhibited remarkable PTCR characteristics with a resistance jump of three order of magnitude.
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