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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.117  No.1363 (March) (2009)  >  pp.402-406

Journal of the Ceramic Society of Japan
<<Previous article Vol.117  No.1363 (March) (2009)   pp.402 - 406 Next article>>

Study on low temperature sintering and microwave dielectric properties of Ba2Ti9O20-based ceramics

Ying-Chieh LEE1), Ko-Wei WENG2), Wen-Hsi LEE3) and Yen-Lin HUANG1)
1) Department of Material Engineering, National PingTung University of Science & Technology
2) Institute of Materials and Systems Engineering, MingDao University
3) Department of Electrical Engineering, National Cheng Kung University


  The microwave dielectric properties and microstructures of Ba2Ti9O20-based ceramics were investigated as a function of B2O3 content and sintered at 940°C for 2 h. Densities of the specimens were enhanced with an increase of B2O3 up to 3 mass% and then decreased. The specimens could be sintered at 940°C without the degradation of the microwave dielectric properties of the specimens. The results of X-ray diffraction (XRD) indicate the presence of five crystalline phases, Ba2Ti 9O20, BaZr(BO3)2, BaZrO3, BaTi4O9, and Zn3B2O6, in the sintered ceramics, depending upon the amount of B2O3 addition. Moreover, the microstructure of Ba2Ti9O20-based ceramic with 3 mass% B2O3 addition was analysed by using a transmission electron micrograph, which the composition of dendrite phase should be BaZr(BO3)2. The specimens with 3 mass% B2O3 sintered at 940°C for 2 h showed εr of 28.3, Q × f value of 10784 (Q = 1477), and TCF (τf ) of -8.2 ppm/°C.


Keyword:
Ba2Ti9O20, Dielectric constant, Quality factor, Temperature coefficient of resonant frequency

Received: October 14, 2008
Accepted: January 15, 2009 , Published online: March 01, 2009
Copyright (c) 2009 The Ceramic Society of Japan

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