摘要
用传统的固相反应烧结法制备了（1-xmol％）BaTi03-xm01％（Bi0．5Na0.5）TiO3（BBNTx）高温无铅正温度系数电阻（positive temperature coefficient of resistivity，PTCR）陶瓷。x射线衍射表明所有的BBNTx陶瓷形成了单一的四方钙钛矿结构。SEM分析结果显示随着BNT含量的增加，陶瓷晶粒尺寸减小。空气中烧结的0．2mol％Nb掺杂的BBNT1陶瓷，室温电阻率为～102^Ω·cm，电阻突跳为～4．5个数量级，居里温度为～150℃。氮气中烧结的0．3m01％Nb掺杂的BBNh（10≤x≤60）陶瓷，同样具有明显的PTCR效应，居里温度在180～235℃之间。随着BNT含量的增加，材料的室温电阻率增大，同时陶瓷的电阻突跳比下降。
High curie temperature （To） （1-xmol%）BaTiO3-xmol%（Bi0.5Na0.5）TiO3（BBNTx） lead-free positive tem- perature coefficient of resistivity（PTCR） ceramics were prepared by the conventional solid state reaction sintering method. XRD patterns showed that all BBNTx samples had a single tetragonal phase perovskite structure. The SEM results showed that as the content of BNT increased from 1mol% to 60mo1%, the average grain size monotonously decreased. The 0.2mo1% Nb-doped BBNT1 ceramic sintered in air had low room-temperature resistivity （,O25） of ~1O2 f~ .cm and high resistivity jump （maximum resistivity [Pmax]/minimum resistivity [Pmin]） of-4.5 orders of magnitude with Tc at about 150℃. The 0.3mo1% Nb-doped BBNTx（10≤x≤60） ceramics, sintered in N2, also showed distinct PTCR ef- fect with Tc between 180℃ and 235℃. As the BNT content increased, the P25 of the BBNTx rapidly increased with the resistivity jump decrease.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2015年第6期576-580,共5页
Journal of Inorganic Materials
基金
中国科学院无机功能材料与器件重点实验室开放基金(KLIFMD-2012-02)
贵州省优秀人才基金(黔教合KY字[2012]102号和TZJF-2011-10)
贵州省大学生创新项目(201310665002
S1250)~~
