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无机材料学报

• 研究论文 • 上一篇    下一篇

(Sr,Ca)TiO3陶瓷材料的结构与介电性能

刘粤惠; 陈旭明   

  1. 华南理工大学材料学院 广州 510641
  • 收稿日期:2002-02-06 修回日期:2002-04-11 出版日期:2003-03-20 网络出版日期:2003-03-20

Structure and Dielectric Properties of (Sr,Ca)TiO3 Ceramics

LIU Yue-Hui; CHEN Xu-Ming   

  1. Material College; South China University of Technology; Guangzou 510641; China
  • Received:2002-02-06 Revised:2002-04-11 Published:2003-03-20 Online:2003-03-20

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摘要： 研究(Sr,Ca)TiO3系统陶瓷材料的组成、结构与介电性能关系.当ST/CT比值约为7:3时,主晶相(Sr0.7Ca0.3)TiO3形成完全互溶钙钛矿型固溶体,具有立方顺电相结构;系统中微量钨青铜型新化合物铌酸钛钡BTN对主晶相(Sr0.7Ca0.3)TiO3的介电性能起进一步的改善作用.获得具有理想介电性能(ε(20℃1MHZ)>250,αc(-55～+125℃)=-1150ppm/℃,tgδ(20℃1MHZ)<5×10-4,ρv(20℃100VDC)>1013Ω·cm)、不含Pb、Bi的Q组MLC瓷料.

关键词: 钛酸锶钙, 铌酸钛钡, 结构, 介电性能

Abstract: The phase component, structure and dielectric properties of (Sr,Ca)TiO3 systems were studied. When ST/CT
ratio is 7:3, a main crystalline phase (Sr0.7Ca0.3)TiO3 complete solid solution with the ABO_3 perovskite structure is formed,
the dielectric properties are improved by a microscale next crystalline phase BNT(Ba6Ti2Nb8O30) with the tungsten bronze structure
in the system. The new ceramic materials with excellent dielectric properties (ε(20℃ 1MHZ)≥250, αc(-55～+125℃)=-1150ppm/℃, tgδ(20℃ 1MHZ)<5×10-4, ρv(20℃ 100VDC)≥1013Ω·cm) do not contain lead or bismuth , and can be used for Q group multilayer ceramic capacitors.

Key words: strontium-calcium titante, barium titanium niobate, structure, dielectric properties

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