首页|Positive temperature coefficient of resistivity effects of semiconducting (Bi1/2Na1/2) TiO3-CaTiO3-BaTiO3 ceramics sintered in air atmosphere
Positive temperature coefficient of resistivity effects of semiconducting (Bi1/2Na1/2) TiO3-CaTiO3-BaTiO3 ceramics sintered in air atmosphere
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Y3+-doped (Bi1/2Na1/2)TiO3-CaTiO3-BaTiO3 (BNCBT) positive temperature coefficient of resistivity (PTCR) ceramics sintered in air atmosphere were investigated in this study. (Bi1/2Na1/2) TiO3 (BNT) component can remarkably increase the onset temperature Tc of PTCR ceramics with the expensive of the resistivity R25 increase. CaTiO3 (9-27 mol%) component can decrease the resistivity, and adjust the effects of BNT phase on the Tc point. For the sample containing 3 mol% CaTiO3, the Tc raises from 122° to 153° when only 0.6 mol% BNT added, while for the ones with higher CaTiO3 content (9-27 mol%), Tc is only increased by a rate of 8-9°/1.0 mol% BNT. The effects of BNT and CaTiO3 components on Rmln (negative temperature coefficient effect) are also discussed.
lead-free materialspositive temperature coefficient of resistivity (PTCR)(Bi1/2Na1/2) TiO3CaTiO3negative temperature coefficient (NTC) effect
MA Ji、ZHU Xing-wen、ZHANG Fang、XU Qiong、JIANG Wen-zhong、ZHOU Xiao
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School of Materials Science and Technology, Shanghai University, Shanghai 200072, P. R. China
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