Abstract
0.95(Ca0.88Sr0.12)TiO3-0.05(Bi0.5Na0.5)TiO3 ceramics were prepared by a soft chemistry method (co-precipitation), which was done at lower temperature and shorter reaction time than the conventional solid-state reaction method. The thermal decomposition process, phase composition, microstructure and dielectric properties of the samples were characterized by TGA, X-ray diffraction, scanning electron microscopy and precision impedance analyzer. Comparing to the conventional solid-state reaction method, the co-precipitation method not only effectively lowered the calcination temperature of (Ca0.88Sr0.12)TiO3 powders from 1100 to 850°C and the sintering temperature from 1275 to 1225°C, but also improved the sintered properties and the dielectric properties, especially the Q × f value increased from 8116 to 8754 GHz and the τf decreased from + 639 to + 602 ppm/°C. Moreover, the ceramics prepared by co-precipitation method showed more uniform, fine-grained microstructure. The optimal integrated microwave dielectric properties (εr = 180, Q × f = 8754 GHz, τf = + 602 ppm/°C) were achieved for 0.95(Ca0.88Sr0.12)TiO300.05(Bi0.5Na0.5)TiO3 ceramics sintered at 1225 °C for 4 h.
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