期刊
SENSORS AND ACTUATORS A-PHYSICAL
卷 128, 期 2, 页码 265-269出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.sna.2006.01.022
关键词
BaTiO3-based; NBT; T-C; PTC effects
In order to prepare lead-free BaTiO3-based PTC with middle Curie point. the incorporation of Bi1/2Na1/2TiO3 (abbreviated to NBT) into BaTiO3-based ceramics was investigated on samples containing 0.1, 0.5, 1, 1.5, 1.6, 1.8, 2 mol% of NBT. It was found that for all samples containing up to 1.5 mol%, the Curie temperature was obviously improved with the increasing of NBT content, and the T-C raised to 150 degrees C from 97 degrees C just only 1.5 mol% NBT added. Because A-O bonds were weakened, which induced that Ti-O bonds were strengthened correspondingly, and the actions between Ti4+ (a departure of center) and its near O2- were so strong that Ti4+ could not resume its seat except that it was under the higher temperature, hence the Curie temperature was improved. At the same time, the PTC effects were also meliorated which attributed to vast electron capture centers formed by Bi2O3 acting with MnO. However, when the amount of NBT exceeded 1.5 mol%, the samples were dielectric material and had no PTC effects, but it was worth noting that the p-T curve of the samples sintered in reducing atmosphere was linear. (c) 2006 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据