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Preparation and Characterization of a New Microwave Dielectric Ceramic Ba4ZnTi11O27

Preparation, sintering behavior, and microwave dielectric properties of Ba4ZnTi11O27 ceramic were investigated. The single-phase Ba4ZnTi11O27 ceramic can be well densified in the temperature range from 1175° to 1250°C with a relative density about 97%. X-ray diffraction data show that Ba4ZnTi11O27 has a monoclinic structure (C2/m), with lattice parameters of a=19.81549 Å, b=11.43072 Å, and c=9.91129 Å when the sintering temperature is 1200°C. Pure monoclinic Ba4ZnTi11O27 ceramic sintered at 1200°C for 2 h exhibits good microwave dielectric properties with a permittivity about 36.8, Q×f value about 16 460 GHz, and temperature coefficient of resonant frequency about 17.2 ppm/°C. The addition of BaCu(B2O5) can effectively lower the sintering temperature from 1200° to 925°C and does not induce degradation of the microwave dielectric properties. Obviously, the Ba4ZnTi11O27 ceramic can be applied to microwave low-temperature cofired ceramics devices.

Authors:   Huanfu Zhou, Xiuli Chen, Liang Fang, Changzheng Hu, Hong Wang
Journal:   Journal of the American Ceramic Society
Year:   2010
DOI:   10.1111/j.1551-2916.2009.03561.x
Publication date:   14-Jan-2010
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