无机材料学报

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BaTiO3基PTCR陶瓷中B2O3蒸汽掺杂的异常行为

齐建全; 李龙土; 朱青; 王永力; 桂治轮   

  1. 清华大学材料系, 北京 100084
  • 收稿日期:2000-07-10 修回日期:2000-08-28 出版日期:2001-07-20 网络出版日期:2001-07-20

Abnormal Behavior of B2O3 Vapor Dopants in BaTiO3 Based PTCR Ceramics

QI Jian-Quan; LI Long-Tu; ZHU Qing; Wang Yong-Li; GUI Zhi-Lun   

  1. Dept. of Mater. Sci. and Eng.; Tsinghua Univ. Beijing 100084; China
  • Received:2000-07-10 Revised:2000-08-28 Published:2001-07-20 Online:2001-07-20

摘要: 钛酸钡基半导化陶瓷中的PTCR效应通常与材料中的施受主掺杂密切相关.在高温下B具有较高的蒸汽压,通过B蒸汽掺杂的研究表明,含主族元素B的氧化物蒸汽掺杂,钛酸钡基半导化陶瓷样品的升阻比同样得到了大幅度提高,同时室温电阻率也有所增加.B蒸汽掺杂BaTiO基材料的PTCR效应的提升可能得益于硼填隙和钡缺位相关的复合缺陷在晶界上的形成.

关键词: B2O3, BaTiO3, PTCR

Abstract: The PTCR (Positive Temperature Coefficient Resistivity) effect of BaTiO3 based semiconducting ceramics is usually allied to the donor or acceptor. B2O3 with
high vapor pressure at high temperatures can be used as vapor dopants. The behavior of B2O3 vapor dopants was studied in BaTiO3 based semiconducting
ceramics. The dramatic results show that the resistivity jumping of the samples is improved distinctly, in the mean time, the room temperature resistivity is also
increased. The enhancement of the PTCR effect of the samples doped with B2O3 vapor is possibly associated with the interstice of boron ion and barium vacancy or
their related composite defects.

Key words: B2O3, BaTiO3, PTCR

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