【作者】 骆颖； 刘心宇； 李旭琼；

【Author】 LUO Ying, LIU Xin-yu,LI Xu-qiong (College of Materials Science and Engineering, Central south University, Changsha 410083, China; Research Center for Materials Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China; Guilin Academy of Air Force, Guilin 541004,China)

【机构】 中南大学材料学院； 桂林电子工业学院材料中心；

【摘要】 研究了Nb2O5掺杂的BaBiO3-BaTiO3系 NTC材料的组成、相结构和断面形貌以及材料中的 Nb2O5含量对材料电性能的影响。结果表明试验样品在比较宽的温度范围都显示了良好的NTC效应。X 射线衍射分析表明烧结体中的相由钙钛矿结构的Ba- TiO3和单斜结构的BaBiO3组成。利用扫描电镜分析了样品的断面形貌,能谱确定了样品中相的分布规律。在给定BaTiO3和BaBiO3的组成下,随着材料中 Nb2O5含量的增加样品的室温电阻率减小到一个最小值然后又增大。更多还原

【Abstract】 The components, phase structure and cross sectional morphologies, and the effects of Nb2O5 content on electrical properties of BaBiO3-BaTiO3 system NTC materials were all investigated. The results show that the samples only show negative temperature coefficient effect over a wide temperature range. X-ray diffraction analysis displays that Major phases present in the sintered bodies were the BaTiO3 compounds with a perovskite structure and the BaBiO3 compounds with a monoclinal structure. SEM and EDS were employed to investigate the microstructure and distribution of BaBiO3 in the samples. At a given BaTiO3 and BaBiO3 content, as the a mount of Nb2O5 in BaBiO3-BaTiO3 system ceramics increased, the room temperature resistivity decreased to a minimum value and then increased again.更多还原