高等学校化学学报

高等学校化学学报 ›› 2001, Vol. 22 ›› Issue (12): 2065.

• 研究论文 • 上一篇    下一篇

超细钛酸钡的表面改性

崔爱莉1, 陈仁政2, 尉京志1, 李龙土2   

  1. 1. 清华大学化学系;
    2. 清华大学材料科学与工程系, 北京 100084
  • 收稿日期:2000-10-08 出版日期:2001-12-24 发布日期:2001-12-24
  • 通讯作者: 崔爱莉(1962年出生),女,博士,讲师,从事纳米材料研究.E-mail:cuial@tsinghua.edu.cn E-mail:cuial@tsinghua.edu.cn

Surface Modification of Ultra-fine Barium Titanate

CUI AiLi1, CHEN RenZheng2, WEI JingZhi1, LI LongTu2   

  1. 1. Department of Chemistry;
    2. Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
  • Received:2000-10-08 Online:2001-12-24 Published:2001-12-24

PDF (PC)

被引次数

39

摘要： 利用Sol-gel法成功地在超细钛酸钡粉体表面包覆了厚度约5nm的均匀SiO2膜.采用HRTEM,XPS和XRD等多种分析方法,证实了SiO2薄膜的存在.并首次提出钛酸钡水解后水玻璃在TiO2-x表面溶胶-凝胶化的包覆机理.改性后的钛酸钡与纯钛酸钡相比,SiO2包覆可促进烧结,包覆SiO2坯体在1190℃达到最大收缩速率,而纯钛酸钡坯体达到最大收缩速率的温度为1260℃.坯体的收缩率由未包覆前的-15变化到-19.3.包覆工艺改善了介电性能,使介温曲线平坦,对制造钛酸钡薄层电容器有重要的价值.

关键词: 表面包覆, SiO2, BaTiO3, 介电性能

Abstract: By using solgel method, SiO2 nanofilms of 5 nm were coated on the surface of ultrafine BaTiO3. The coated powders and ceramics were analyzed by using HRTEM, XPSand XRDrespectively. The coating mechanism was first reported that water glass solgelated on TiO2-x surfaces after BaTiO3 was hydrolyzed slightly. Compared with pure BaTiO3, SiO2 coating process can enhance the sintering property at the lower sintering temperatures from 1260 ℃ to 1190 ℃. The ceramic shrinkage mass fraction changes from-15 to-19.3. And the coating process improves the dielectric property of ceramics, flatten εT curve. The coating process is promising for the thin layer BaTiO3based capacitors.

Key words: Surface coating, SiO2, BaTiO3, Dielectric properties

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