Effect of donor concentration on the PTCR behavior of Y-doped BaTiO3–(Bi1/2Na1/2)TiO3 ceramics
Effect of donor concentration on the PTCR behavior of Y-doped BaTiO3–(Bi1/2Na1/2)TiO3 ceramics
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DOI：
10.1007/s10854-012-0774-x
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
S. Leng;Guorong Li;Liaoying Zheng;W. Shi;Yalong Zhu
中科院分区：
文献类型：
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作者：
S. Leng;Guorong Li;Liaoying Zheng;W. Shi;Yalong Zhu
采用传统固相反应法制备了99mol%BaTiO3 - 1mol%（Bi 1/2Na 1/2）TiO 3（BBNT 1）和90mol%BaTiO3 - 10mol%（Bi 1/2Na 1/2）TiO 3（BBNT 10）无铅正温度系数（PTCR）陶瓷。研究了施主浓度对BBNT陶瓷显微结构和PTCR性能的影响。结果表明，BBNT 1和BBNT 10陶瓷在空气或氮气气氛中烧结时均形成了单一的钙钛矿结构。0.2在空气中于1，330 °C烧结30 min的掺杂Y的BBNT 1的室温电阻率（ρ25）约为60 Ω cm，电阻率跃变[最大电阻率（ρmax）/最小电阻率（ρmin）]约为4.2个数量级，Tc约为150 °C。0.4在1,250 °C、N2气氛中烧结3 h的掺Y BBNT 10样品的电阻率ρ 25约为100 Ω cm，电阻率跃变约为4.7个数量级，Tc约为180 °C。BBNT 10的击穿电压高达200 V/mm（a.c.）与BBNT 1相比，这些BBNT 10陶瓷是高温无铅PTCR材料的理想候选材料。
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 Tcabout 150 °C. 0.4 mol% Y-doped BBNT10, sintered at 1,250 °C for 3 h in N2, has ρ25of ~100 Ω cm and resistivity jump of ~4.7 orders of magnitude with Tcabout 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.