Abstract
The sintering behavior, microstructure and microwave dielectric properties of complex pyrophosphate compounds AMP 2O 7 (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 ( ɛ 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 SrZnP 2O 7 could be co-fired with copper in reduced atmosphere. The microwave dielectric properties of SrZnP 2O 7 sintered at 950 °C in reducing atmosphere are: ɛ r = 7.06, Q × f = 52781 GHz, τ f = −70 ppm/°C. In terms of its lower sintering temperature, chemical compatibility with copper and good microwave dielectric properties, SrZnP 2O 7 ceramic is very promising for low temperature co-fired ceramic (LTCC) applications.
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