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Erschienen in:
01.01.2013
Effect of donor concentration on the PTCR behavior of Y-doped BaTiO3–(Bi1/2Na1/2)TiO3 ceramics
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 1/2013
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Abstract
Lead-free positive temperature coefficient of resistivity (PTCR) ceramics of 99 mol%BaTiO3–1 mol%(Bi1/2Na1/2)TiO3 (BBNT1) and 90 mol%BaTiO3–10 mol%(Bi1/2Na1/2)TiO3 (BBNT10) were prepared by the conventional solid state reaction method. The effect of donor concentration on the microstructure and PTCR behavior of the BBNT ceramics were investigated. The results show that all BBNT1 and BBNT10 ceramics have formed a single perovskite structure with tetragonal phase when sintered in air or N2. 0.2 mol% Y-doped BBNT1, sintered at 1,330 °C for 30 min in air, has room-temperature resistivity (ρ25) of ~60 Ω cm and resistivity jump [maximum resistivity (ρmax)/minimum resistivity (ρmin)] of ~4.2 orders of magnitude with Tc about 150 °C. 0.4 mol% Y-doped BBNT10, sintered at 1,250 °C for 3 h in N2, has ρ25 of ~100 Ω cm and resistivity jump of ~4.7 orders of magnitude with Tc about 180 °C. The BBNT10 has higher breakdown voltage of 200 V/mm (a.c.) than that of BBNT1, making these BBNT10 ceramics promising candidates for high temperature lead-free PTCR materials.