高居里温度BaTiO3-(Bi0.5Na0.5)TiO3无铅正温度系数电阻陶瓷的制备

doi:10.15541/jim20140568

无机材料学报 ›› 2015, Vol. 30 ›› Issue (6): 576-580.DOI: 10.15541/jim20140568

高居里温度BaTiO₃-(Bi_0.5Na_0.5)TiO₃无铅正温度系数电阻陶瓷的制备

冷森林¹, 贾飞虎¹, 钟志坤¹, 杨琴芳¹, 李国荣², 郑嘹赢²

(1. 铜仁学院物理与电子工程学院, 铜仁554300; 2.?中国科学院上海硅酸盐研究所, 上海200050)

收稿日期:2014-11-07 修回日期:2015-02-14 出版日期:2015-06-04 网络出版日期:2015-05-22
作者简介:冷森林(1981–), 男, 副教授. E-mail: lengsenlin@sohu.com
基金资助:
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)

Fabrication of High T_c BaTiO₃-(Bi_0.5Na_0.5)TiO₃ Lead-free Positive Temperature Coefficient of Resistivity Ceramics

LENG Sen-Lin¹, JIA Fei-Hu¹, ZHONG Zhi-Kun¹, YANG Qin-Fang¹, LI Guo-Rong², ZHENG Liao-Ying²

(1. Institute of Physics and Electronics Engineering, Tongren University, Tongren?554300, China; 2. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China)

Received:2014-11-07 Revised:2015-02-14 Published:2015-06-04 Online:2015-05-22
About author:LENG Sen-Lin. E-mail: lengsenlin@sohu.com
Supported by:
Foundation of Key Laboratory of Inorganic Function Material and Device, Chinese Academy of Sciences (KLIFMD2012-02);Special Foundation for Scientists of Guizhou Province (KY[2012]102 and TZJF-2011-10);Student Innovation Project of Guizhou Province (201310665002, S1250)

摘要/Abstract

摘要：

用传统的固相反应烧结法制备了(1-xmol%)BaTiO₃-xmol%(Bi_0.5Na_0.5)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0.3mol% Nb掺杂的BBNTx(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。

关键词: BaTiO3-(Bi0.5Na0.5)TiO3, 无铅, 正温度系数电阻, 制备

Abstract:

High curie temperature (T_c) (1-xmol%)BaTiO₃-xmol%(Bi_0.5Na_0.5)TiO₃(BBNTx) lead-free positive temperature 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 60mol%, the average grain size monotonously decreased. The 0.2mol% Nb-doped BBNT1 ceramic sintered in air had low room-temperature resistivity (ρ₂₅) of ~10²Ω·cm and high resistivity jump (maximum resistivity [ρ_max]/minimum resistivity [ρ_min]) of ~4.5 orders of magnitude with T_c at about 150℃. The 0.3mol% Nb-doped BBNTx(10≤x≤60) ceramics, sintered in N₂, also showed distinct PTCR effect with T_cbetween 180℃ and 235℃. As the BNT content increased, the ρ₂₅ of the BBNTx rapidly increased with the resistivity jump decrease.

Key words: BaTiO3-(Bi0.5Na0.5)TiO3, lead-free, positive temperature coefficient of resistivity, fabrication

中图分类号:

TQ174

冷森林, 贾飞虎, 钟志坤, 杨琴芳, 李国荣, 郑嘹赢. 高居里温度BaTiO₃-(Bi_0.5Na_0.5)TiO₃无铅正温度系数电阻陶瓷的制备[J]. 无机材料学报, 2015, 30(6): 576-580.

LENG Sen-Lin, JIA Fei-Hu, ZHONG Zhi-Kun, YANG Qin-Fang, LI Guo-Rong, ZHENG Liao-Ying. Fabrication of High T_c BaTiO₃-(Bi_0.5Na_0.5)TiO₃ Lead-free Positive Temperature Coefficient of Resistivity Ceramics[J]. Journal of Inorganic Materials, 2015, 30(6): 576-580.

图/表 5

图1 Nb2O5掺杂的BBNTx(x=1、10、20、40、60)陶瓷的XRD图谱

Fig. 1 XRD patterns of Nb2O5 doped BBNTx (x=1, 10, 20, 40, 60) ceramics

图2 Nb2O5掺杂的BBNTx(x=1、10、20、60)陶瓷自然表面的SEM照片

Fig. 2 SEM images of the sintered surfaces of Nb2O5 doped BBNTx(x=1, 10, 20, 60) ceramics

图3 不同施主掺杂的BBNT1陶瓷的电阻温度特性

Fig. 3 Resistivity-temperature characteristics of the BBNT1 ceramics doping different donors

图4 过量TiO2对Nb2O5掺杂的BBNT1陶瓷电阻温度特性的影响

Fig. 4 Influences of excess TiO2 on the resistivity-temperature characteristics of Nb2O5 doped BBNT1 ceramics

图5 Nb2O5掺杂的BBNTx(x=10、20、30、40、50、60)陶瓷的电阻温度特性

Fig. 5 Resistivity-temperature characteristics of Nb2O5 doped BBNTx(x=10, 20, 30, 40, 50, 60) ceramics

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高居里温度BaTiO₃-(Bi_0.5Na_0.5)TiO₃无铅正温度系数电阻陶瓷的制备

Fabrication of High T_c BaTiO₃-(Bi_0.5Na_0.5)TiO₃ Lead-free Positive Temperature Coefficient of Resistivity Ceramics

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