Fabrication of Lead-free Semiconducting Ceramics Using BaTiO3-(Bi1/2Na1/2)TiO3 System by Sintering in Air Atmosphere

被引：1
|
作者：
Tateishi, Takashi [1 ]
Han Joong-Sang [1 ]
Takeda, Hiroaki [1 ]
Hoshina, Takuya [1 ]
Kunej, Spela [2 ]
Tsurumi, Takaaki [1 ]
机构：
[1] Tokyo Inst Technol, Grad Sch Sci & Engn, Nanophonon Lab, Meguro Ku, 2-12-1 Ookayama, Tokyo 1528552, Japan
[2] Jozef Stefan Inst, Dept Adv Mat, Ljubljana 1000, Slovenia
来源：
ELECTROCERAMICS IN JAPAN XIV | 2011年 / 485卷
关键词：
semiconducting ceramics; barium titanate; bismuth sodium titanate; lead-free;
D O I：
10.4028/www.scientific.net/KEM.485.245
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
BaTiO3-(Bi1/2Na1/2)TiO3 (abbreviated as BT-BNT) solid solution ceramics, as a lead-free PTC (Positive Temperature Coefficient of resistivity) thermistor material usable over 130 degrees C, were synthesized in air atmosphere. By conventional processes, La-doping was not effective in giving semiconducting property to the BT-BNT ceramics because of volatilization of sodium and bismuth during sintering. By preventing the volatilization by lowering the sintering temperature using very fine TiO2 powder and by adding calcium oxide to calcined BT-BNT powders, we obtained BT-BNT semiconducting ceramics which shows a resistivity change near Curie temperature.
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收藏
页码：245 / +
页数：2
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