Glass-free LTCC microwave dielectric ceramics |
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Authors: | Jian-jiang Bian Dong-Wan Kim Kug Sun Hong |
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Affiliation: | aSchool of Material Sciences & Engineering, Seoul National University, Seoul 151-742, South Korea bDepartment of Inorganic Materials, Shanghai University, Shanghai 200072, China |
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Abstract: | The sintering behavior, microstructure and microwave dielectric properties of complex pyrophosphate compounds AMP2O7 (A = Ca, Sr; M = Zn, Cu) were investigated in this paper. All compounds could be densified below the temperature of 950 °C without any glass addition, and exhibit low permittivity (r < 8), high Q × f value and negative temperature coefficient of resonant frequency. The Q × f value was discussed from the point of view of bond strength. The chemical compatibility with silver and copper was also investigated. All compounds seriously react with silver at 700 °C. However SrZnP2O7 could be co-fired with copper in reduced atmosphere. The microwave dielectric properties of SrZnP2O7 sintered at 950 °C in reducing atmosphere are: r = 7.06, Q × f = 52781 GHz, τf = −70 ppm/°C. In terms of its lower sintering temperature, chemical compatibility with copper and good microwave dielectric properties, SrZnP2O7 ceramic is very promising for low temperature co-fired ceramic (LTCC) applications. |
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Keywords: | A. Ceramics D. Dielectric properties |
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