Acta Phys. -Chim. Sin. ›› 2003, Vol. 19 ›› Issue (01): 17-20.doi: 10.3866/PKU.WHXB20030105

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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

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