Positive temperature coefficient of resistivity effects of semiconducting (Bi(1/2)Na(1/2)) TiO_3-CaT

• 作 者: 马季 朱兴文 张芳 徐琼 姜文中 周晓
• 机 构: School of Materials Science and Engineering,Shanghai University,
• 出 处: Journal of Shanghai University(English Edition)
• 发表日期: 2004年期
• 关键词: sintered ceramics resistivity remarkably ferroelectric semicon dielectric expens

Y3+-doped (Bi 1/2 Na 1/2) TiO 3-CaTiO 3-BaTiO 3 (BNCBT) positive temperature coefficient of resistivity (PTCR) ceramics sintered in air atmosphere were investigated in this study. (Bi 1/2 Na 1/2) TiO 3 (BNT) component can remarkably increase the onset temperature T c of PTCR ceramics with the expense of the resistivity R 25 increase. CaTiO 3 (9-27 mol%) component can decrease the resistivity, and adjust the effects of BNT phase on the T c point. For the sample containing 3 mol% CaTiO 3 , T c raises from 122 °C to 153 °C when only 0.6 mol% BNT added, while for the ones with higher CaTiO 3 content (9-27 mol%), T c is only increased by a rate of 8-9°C/1.0 mol% BNT. The effects of BNT and CaTiO 3 components on R25/Rmin (negative temperature coefficient effect) are also discussed.

(Bi 1/2 Na 1/2) TiO 3-CaTiO 3 -BaTiO 3 (BNCBT) positive temperature coefficient of resistivity (PTCR) ceramics sintered in air atmosphere were investigated in this study. (Bi 1/2 Na 1 / 2) TiO 3 (BNT) component can remarkably increase the onset temperature T c of PTCR ceramics with the expense of the resistivity R 25 increase. CaTiO 3 (9-27 mol%) component can decrease the resistivity, and adjust the effects of BNT phase on the T c point. For the sample containing 3 mol% CaTiO 3, T c raises from 122 ° C to 153 ° C when only 0.6 mol% BNT added, while for the ones with higher CaTiO 3 content (9-27 The effects of BNT and CaTiO 3 components on R25 / Rmin (negative temperature coefficient effect) are also discussed.