Characteristics of porous BaTiO3-based PTC thermistors fabricated by adding graphite powders

被引：19
|
作者：
Park, K [1 ]
机构：
[1] Sejong Univ, Ctr Adv Mat, Dept Adv Mat Engn, Seoul 143747, South Korea
来源：
MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY | 2004年 / 107卷 / 01期
关键词：
thermistors; electrical properties; BaTiO3; graphite;
D O I：
10.1016/j.mseb.2003.10.003
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The crystalline structure, microstructure, and electrical properties of porous graphite-containing BaTiO3-based PTC thermistors were studied. The sintered ceramics showed a tetragonal perovskite structure, irrespective of the added graphite content. The added graphite formed the interstitial solid solutions with Ba0.999Sb0.001TiO3 and was distributed homogeneously in the sintered ceramics. The grain size of the as-sintered graphite-containing BaTiO3-based ceramics was much larger than that of the as-sintered graphite-free ones. This is mainly due to the exothermic reactions of the graphites and oxygen molecules in the ceramics. The porosity of the as-sintered ceramics increased with increasing graphite content due to an enhanced evolution of CO and CO2 gases associated with the exothermic reactions. It was found that the newly prepared porous graphite-containing BaTiO3-based PTC thermistors showed a large PTCR effect. (C) 2003 Ellsevier B.V. All rights reserved.
引用
收藏
页码：19 / 26
页数：8
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