An anomalous positive temperature coefficient of electrical resistivity(PTCR) was investigated in a ferroelectric lead-free perovskite-type compound (Bi_0.5K_0.5)TiO₃ within BaTiO₃-based solid solution ceramics. The effect of Nb₂O₅ content on the electrical properties and the microstructure of (1-x) (Bi_0.5K_0.5)TiO₃- x BaTiO₃ (BKBT) ceramics made using a conventional mixed oxide process also has been studied. The Curie Temperature was obviously increased with the increasing of (Bi_0.5K_0.5)TiO₃ content. The addition of Nb₂O₅ to BKBT has significantly improved its PTCR properties. For the sample containing 0.025 mol% Nb₂O₅, it showed good PTCR properties; low resistivity at room temperature (ρr) of 30 Ω•cm, a high PTCR intensity of approximately 3.3×10³ with high Curie temperature (TC) of 155^oC.

1. PRESENTATION: Investigation of a PTCR Effect in The (Bi_{0.5}K_{0.5})TiO_{3}-BaTiO_{3} Solid Solution Semiconducting Ceramics, Microsoft Office Document, 0MB

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