Low Temperature Co-Fired ZnNb₂O₆ Dielectric Ceramic Doped by B₂O₃

Abstract:

To lower the sintering temperature of ZnNb₂O₆ microwave dielectric ceramic, ZnNb₂O₆ doped with B₂O₃ were prepared by the traditional solid state reaction method. The effects of the amount of B₂O₃ (0.25-5.0wt.%) on the microstructure, density and electrical performances were investigated. The results show that a pure columbite ZnNb₂O₆ phase was obtained for all B₂O₃-doped ceramics. The microwave dielectric properties reached the maximum values of ε_r = 24.1, Q×f = 19502 GHz, τ_f = -52.19 ppm/°C for 1wt% B₂O₃-doped ZnNb₂O₆ ceramic sintered at 1050 °C for 4 h. All of evidences suggest that the enhancement of microwave dielectric properties is due to the enhanced ions-energy and ionic diffusion with the increase of sintering temperature. Furthermore, B₂O₃ doping can generate liquid phase and reduce the activation energy of diffusion to promote the materials sintering.

• Periodical: Materials Science Forum (Volume 849)
• Pages: 209-215
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.849.209
• Online since: March 2016
• Authors: Jian Yang, Ji Kang Yan, Jing Hong Du, Fang Chun Yan, Kun Yong Kang, Jian Hong Yi, Guo You Gan*
• Keywords: B₂O₃, Doping, LTCC, Microwave Dielectric Ceramic, ZnNb₂O₆

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