Low Temperature Sintering of BaO–ZnO–TiO₂ Ceramics for LTCC Applications

Abstract:

In order to develop a new middle dielectric constant LTCC materials, the effects of BaO–ZnO–TiO₂–B₂O₃–SiO₂(BZTBS) and/or BaCu(B2O5)(BCB2) on the phase composition, microstructure and microwave dielectric properties of BaO–ZnO–TiO2 ceramics were investigated by solid-state reaction. It was found that BCB2 mainly worked as sintering aids to lower the sintering temperature and the key role of BZTBS was to affect the phase composition in favour of showing a high Q×f value. Therefore, when 5wt% BZTBS+6wt% BCB2 were co-doped, the sintering temperature was down to 850°C, and the microwave dielectric properties were improved significantly because the densification and grain size distribution were not only improved but also the phase composition was controlled. At last, this ceramics sintered at 850°C for 0.5 h showed good microwave dielectric properties: ε_r=28.4, Q×f=8,030 GHz and τ_f=2 ppm/°C. Also, it was compatible with Ag electrodes, so it was a promising candidate for LTCC application.

• Periodical: Advanced Materials Research (Volumes 476-478)
• Pages: 917-922
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.476-478.917
• Online since: February 2012
• Authors: Sheng Quan Yu, Shu Meng Sun, Bin Tang, Shu Ren Zhang
• Keywords: Ceramic, LTCC, Microwave Dielectric Properties

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