高等学校化学学报

高等学校化学学报 ›› 2005, Vol. 26 ›› Issue (12): 2207.

• 研究论文 • 上一篇    下一篇

稀土气相扩渗BaTiO3基PTC陶瓷的NTCR效应

郝素娥,孙亮,黄金祥,韦永德   

  1. 哈尔滨工业大学应用化学系,哈尔滨150001
  • 收稿日期:2005-02-03 出版日期:1905-03-14 发布日期:1905-03-14
  • 通讯作者: 郝素娥(1965年出生)，女，博士，教授，主要从事稀土功能陶瓷材料研究.E-mail:haosue@hit.edu.cn
  • 基金资助:

    黑龙江省重点攻关项目(批准号：GB02A301)资助.

NTCR Effect of BaTiO3-based PTC Ceramics Penetrated by Rare Earth

HAO Su-E*, SUN Liang, HUANG Jin-Xiang, WEI Yong-De   

  1. Department of Applied Chemistry, Harbin Institute of Technology, Harbin 150001, China
  • Received:2005-02-03 Online:1905-03-14 Published:1905-03-14
  • Contact: HAO Su-E;E-mail:haosue@hit.edu.cn

摘要：

采用稀土气相扩渗法制备了La改性的BaTiO3基PTC陶瓷,并对其室温电阻率的变化及温-阻效应进行了研究.结果表明,BaTiO3基PTC陶瓷经La气相扩渗后,室温电阻率从2.7×109Ω·m下降到220Ω·m,在25～500℃范围内,电阻率随温度升高单调递减,从220Ω·m降至5.8Ω·m,产生了明显的NTCR效应.结合XRD，SEM，EDAX以及介电性能测试结果分析了La气相扩渗BaTiO3基PTC陶瓷NTCR效应的形成机理,建立了NTCR效应的物理结构模型.

关键词: 稀土;气相扩渗;NTCR效应;钛酸钡陶瓷, 稀土, 气相扩渗, NTCR效应, 钛酸钡陶瓷

Abstract:

The modified BaTiO3-based PTC ceramics were prepared by gaseous penetration of rare earth La, and the change laws of the resistivity at room temperature and the temperature- resistivity properties were studied. The experimental results show that the modified BaTiO3 -based PTC ceramics after La penetration have a significant decrease in resistivity at room temperature, which decreases from 2.7×109 to 220 Ω·m,  and the resistivity decreases progressively from 220 to 5.8 Ω·m in the temperatures range from 25 ℃ to 500 ℃, which indicates a significant NTCR effect. Through analyses of XRD, SEM, EDAX and the dielectric properties of the BaTiO3-based PTC ceramics penetrated by La, the forming mechanism of the NTCR effect was explored, and the physical structure model of the NTCR effect was established.

Key words: Rare earth; Gaseous penetration; NTCR effect; BaTiO3 ceramics, Rare earth, Gaseous penetration, NTCR effect, BaTiO3 ceramics

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