Effect of SiO2 sintering additive on the positive temperature coefficient of resistivity (PTCR) behavior of (Bi1/2Na1/2)0.10Ba0.90TiO3 + CaO ceramics

被引：6
|
作者：
Maechler, Daniel [1 ]
Toepfer, Joerg [1 ]
机构：
[1] Univ Appl Sci Jena, Dept SciTec, C Zeiss Promenade 2, D-07745 Jena, Germany
来源：
MATERIALS RESEARCH BULLETIN | 2017年 / 89卷
关键词：
PTCR thermistors; Semiconducting ceramics; Positive temperature coefficient of; resistivity; Barium titanate; SEMICONDUCTING CERAMICS; BATIO3-(BI1/2NA1/2)TIO3; FABRICATION; BATIO3; SYSTEM;
D O I：
10.1016/j.materresbull.2017.02.005
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Lead-free (Bi1/2Na1/2)(0.10)Ba0.90TiO3 ceramics with 3.5 mol% CaO addition and positive temperature coefficient of resistivity (PTCR) behavior were prepared by the mixed-oxide route. Nanocrystalline TiO2 powder is required as raw material to allow complete phase formation during calcination at 800 degrees C. Samples were sintered at T < 1250 degrees C in air to give thermistor ceramics with low room-temperature resistance and significant rise of resistivity at T-c = 155 degrees C. The microstructure formation and electrical properties are sensitive to silica addition. Dense PTCR thermistor ceramics with low room-temperature resistivity rho(RT) = 80 Omega cm and resistivity change rho max/rho min over two orders of magnitude at the Curie temperature were obtained after sintering in air with 0.05 wt% Sio(2) sintering additive. (C) 2017 Elsevier Ltd. All rights reserved.
引用
收藏
页码：217 / 223
页数：7
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