Articles
  • Microwave dielectric properties of glass-Bi2Ti2O7 ceramic composites
  • Sang Ok Yoona, Kwan Soo Kima, Sang Heung Shimb, Yun Han Kima and Shin Kima,*
  • a Department of Ceramic Engineering, Kangung National University, Kangnung 210-702, Korea b Department of Electrical Engineering, Kangwon National University, Samcheok 245-711, Korea
Abstract
The microwave dielectric properties of glass-Bi2Ti2O7 ceramic composites were investigated. Using bismuth-zinc borosilicate (BZBS) glass and TiO2, glass-Bi2Ti2O7 composites were prepared by liquid phase sintering. The linear shrinkage exhibited a two-stage sintering behavior; viscous flow of the liquid phase and then crystallization. The crystalline phases of Bi2Ti4O11 and Bi2Ti2O7 were observed at 700 and 900oC, respectively. The dielectric constant (εr) and the quality factor (Q×f0) were affected by the formation of crystalline phases as well as the density. For the specimen sintered at 900oC, the dielectric constant, the quality factor and the temperature coefficient of the resonant frequency (τf) was respectively 56.4, 518 GHz (105 at 4.898 GHz), and +119 ppm/K.

Keywords: LTCC, Glass-ceramic, TiO2, Bismuth-zinc borosilicate, Bi2Ti2O7.

This Article

  • 2008; 9(1): 34-37

    Published on Feb 28, 2008