Sr0.4Pb0.6TiO3基陶瓷晶界组成对热敏特性的影响

无机材料学报

Sr_0.4Pb_0.6TiO₃基陶瓷晶界组成对热敏特性的影响

赵景畅; 李龙土; 桂治轮

新型陶瓷与精细工艺国家重点实验室清华大学材料科学与工程系北京 100084

收稿日期:2001-04-02 修回日期:2001-05-28 出版日期:2002-03-20 网络出版日期:2002-03-20

Influence of Grain Boundaries on the Properties of Sr_0.4Pb_0.6TiO₃ Thermistors

ZHAO Jing-Chang; LI Long-Tu; GUI Zhi-Lun

State Key Laboratory of New Ceramics and Fine Processing; Dept. of Materials Science and Engineering; Tsinghua University; Beijing 100084; China

Received:2001-04-02 Revised:2001-05-28 Published:2002-03-20 Online:2002-03-20

摘要/Abstract

摘要： 采用固相烧结工艺制备出了Ｓｒ_０．４Ｐｂ_０．６ＴｉＯ_３半导体陶瓷元件，其阻温特性具有独特的ＮＴＣＲ和ＰＴＣＲ复合效应，陶瓷室温电阻率及居里点以下的ＮＴＣＲ效应随着烧结温度的升高而提高，适当过量ＰｂＯ则能降低陶瓷室温电阻率及其ＮＴＣＲ效应．利用ＸＲＤ、ＳＥＭ和ＥＤＳ分别对样品的相结构、形貌及成份分布等进行分析，结果显示晶界中的Ｓｒ，Ｔｉ含量相对较高，而Ｐｂ含量相对较低，材料的阻温特性明显受其影响．铅挥发造成的阳离子空位是该类半导体陶瓷在居里点下出现ＮＴＣＲ效应的主要原因之一，同时探讨了Ｙ^３＋离子掺杂（Ｓｒ，Ｐｂ）ＴｉＯ_３陶瓷的半导化机理和热敏特性．

关键词: （Sr, Pb）TiO₃, PTCR, XTCR

Abstract: A kind of V-shaped thermistor based on Sr_0.4Pb_0.6TiO₃ materials was fabricated by solid
state reaction methods. The samples exhibit novel NTCR effect below the Curie temperature (T_c) and typical PTCR effect above T_c, the room-
temperature resistivities and the values of log(ρ_25℃/ρ_min) increase with elevating soaking temperature. The phase structure, microstructure
and compositional distribution of samples were investigated by using XRD, SEM and EDS respectively. The results show that Sr, Ti
concentrations near the grian boundaries are higher than that in the grains. It is estimated that the NTCR effects of (Sr,Pb)TiO₃
ceramics are closely related to the Pb²⁺ ionic vacancies near the grain boundaries. The semiconductive mechanism of Y³⁺-doped
(Sr,Pb)TiO₃ ceramics was also discussed.

Key words: (Sr, Pb）TiO₃, PTCR, NTCR

中图分类号:

TN373

赵景畅,李龙土,桂治轮. Sr_0.4Pb_0.6TiO₃基陶瓷晶界组成对热敏特性的影响[J]. 无机材料学报.

ZHAO Jing-Chang,LI Long-Tu,GUI Zhi-Lun. Influence of Grain Boundaries on the Properties of Sr_0.4Pb_0.6TiO₃ Thermistors[J]. Journal of Inorganic Materials.

[1]	陈永虹, 林志盛, 张子山, 陈本夏, 王根水. 改性(Sr,Ca)TiO₃基储能陶瓷介电及MLCC性能研究[J]. 无机材料学报, 2022, 37(9): 976-982.
[2]	屈婧婧, 魏星, 宋小辉, 袁昌来, 刘飞. B位(Mg_1/3Ta_2/3)⁴⁺置换对新型Sr基(Sr, Nd, Ca)TiO₃微波陶瓷结构及介电性能的影响[J]. 无机材料学报, 2017, 32(3): 293-298.
[3]	屈婧婧, 魏星, 经本钦, 刘飞, 袁昌来. 高Q值(1-x)(Sr_0.2Nd_0.208Ca_0.488)TiO₃-xNd(Ti_0.5Mg_0.5)O₃微波陶瓷的微结构及介电性能研究[J]. 无机材料学报, 2015, 30(11): 1213-1217.
[4]	李燕燕,李国荣,王天宝,郑嘹赢,冷森林,殷庆瑞. Nb₂O₅掺杂高温无铅(Ba,Bi,Na)TiO₃基PTCR陶瓷结构与电性能研究[J]. 无机材料学报, 2009, 24(2): 374-378.
[5]	邢精成,卞建江,杨建华,黄富强. SrNb₂O₆/Nb₂O₅复合物光催化降解甲基橙的研究[J]. 无机材料学报, 2007, 22(5): 927-930.
[6]	周东祥,郑志平,龚树萍,刘欢,胡云香. 液相法制备BaTiO₃基PTCR粉体的研究[J]. 无机材料学报, 2005, 20(3): 593-598.
[7]	刘欢,龚树萍,陈艳,郑志平,周东祥. 片式BaTiO₃基PTCR注浆成型研究[J]. 无机材料学报, 2004, 19(3): 676-680.
[8]	周志刚,唐子龙,张中太. BaTiO₃基PTCR气敏陶瓷的晶界化学研究[J]. 无机材料学报, 2004, 19(3): 571-578.
[9]	曹明贺,袁俊,周东祥,龚树萍. 低电阻率Ba_0.92Ca_0.08Ti_1.02O₃PTCR陶瓷界面缺陷态研究[J]. 无机材料学报, 2003, 18(6): 1235-1239.
[10]	齐建全,李龙土,樊亦伟,王永力,桂治轮. B₂O₃蒸汽掺杂的中低温烧结Y-BaTiO₃及其PTCR特性研究[J]. 无机材料学报, 2003, 18(4): 818-822.
[11]	周方桥,李莉,傅刚,陈志雄,庄严. SrO-Nb₂O₅-TiO₂系压敏陶瓷中Nb⁵⁺和Sr²⁺的研究[J]. 无机材料学报, 2002, 17(6): 1174-1180.
[12]	齐建全,李龙土,朱青,王永力,桂治轮. BaTiO₃基PTCR陶瓷中B₂O₃蒸汽掺杂的异常行为[J]. 无机材料学报, 2001, 16(4): 739-741.
[13]	钱辰,李勇,唐小锋,唐子龙,钱劲,周志刚. Mn掺杂BaTiO₃基PTCR陶瓷相变的EPR研究[J]. 无机材料学报, 2001, 16(4): 734-738.
[14]	唐小锋,唐子龙,周志刚. BaTiO₃基PTCR陶瓷的复阻抗谱研究[J]. 无机材料学报, 2000, 15(6): 1037-1042.
[15]	唐小锋,陈海龙,周志刚. PTCR陶瓷材料的超低温烧结[J]. 无机材料学报, 2000, 15(4): 697-703.

Sr_0.4Pb_0.6TiO₃基陶瓷晶界组成对热敏特性的影响

Influence of Grain Boundaries on the Properties of Sr_0.4Pb_0.6TiO₃ Thermistors

PDF (PC)

可视化

摘要/Abstract

引用本文

使用本文

参考文献

相关文章 15

编辑推荐

Metrics

本文评价