物理化学学报 >> 2003, Vol. 19 >> Issue (01): 17-20.doi: 10.3866/PKU.WHXB20030105

研究论文 上一篇    下一篇

纳米晶钛酸钡的介电性能

阮圣平;董玮;吴凤清;王永为;于涛;彭增辉;宣丽   

  1. 吉林大学电子科学与工程学院,长春 130023;中国科学院长春光学精密机械与物理研究所,长春 130021;吉林大学化学院,长春 130023
  • 收稿日期:2002-05-07 修回日期:2002-06-17 发布日期:2003-01-15
  • 通讯作者: 吴凤清 E-mail:xbk@mail.jlu.edu.cn

Dielectric Properties of Nanocrystalline BaTiO3

Ruan Sheng-Ping;Dong Wei;Wu Feng-Qing;Wang Yong-Wei;Yu Tao;Peng Zeng-Hui;Xuan Li   

  1. College of Electronic Science & Engineering, Jilin University, Changchun 130023;Changchun Institute of Optics, Fine Mechanics Physics, Chinese Academy of Sciences, Changchun 130021;College of Chemistry, Jilin University, Changchun 130023
  • Received:2002-05-07 Revised:2002-06-17 Published:2003-01-15
  • Contact: Wu Feng-Qing E-mail:xbk@mail.jlu.edu.cn

摘要: 采用硬脂酸凝胶法制备了纳米晶BaTiO3,用差热热重分析、红外光谱分析、X射线衍射分析等手段对产物的形成过程、晶型、粒径进行了分析.通过对材料介电性能的研究发现,纳米材料的静态介电常数远大于常规材料的介电常数,随着粒径的减小,纳米材料的介电常数先增大而后有所降低.随着环境湿度的升高,纳米晶材料的介电常数逐渐增大,在高湿度条件下,其介电常数与湿度成线性关系.

关键词: 介电性能, 钛酸钡, 纳米晶, 溶胶凝胶

Abstract: Nanocrystalline BaTiO3 is prepared using a stearic acid gel method. The synthesis process, crystalline structure and grain sizes of nanocrystal are investigated by differential thermal analysis, thermogravimetric analysis, infrared spectra and X-ray powder diffraction. The experimental results of dielectric properties of nanocrystal indicate that the dielectric constant ε of nanocrystal is much larger than that of bulk materials. With reducing of grain size, the ε of nanocrystalline material increases first, then it falls to smaller value. With the increment of relative humidity, the ε grows up. The relationship between ε and humidity becomes linear with high enough humidity.

Key words: Dielectric properties, BaTiO3, Nanocrystal, Sol-gel