Abstract
A novel system Li2Mg3Ti(O1-x/2Fx)6 (0.06 ≤ x ≤ 0.15) ceramics were synthesized through the solid stated reaction method. The calcining temperature, sintering behavior and microwave dielectric properties of samples were investigated systematically. The effects of different calcining temperatures for Li2Mg3Ti(O0.96F0.08)6 ceramics on sintering behavior and microwave dielectric properties were discussed. The optimum calcining temperature was obtained at 700 °C because the high point defect concentrations with associated high diffusivities promoted the solid state synthesis reaction. In addition, the phase compositions, microstructure and microwave dielectric properties of Li2Mg3Ti(O1-x/2Fx)6 (0.06 ≤ x ≤ 0.15) ceramics were studied. The ɛr and Q × f values showed the similar tendency with the relative density as x increased. Moreover, the amount of liquid phase also could be a significant factor affecting dielectric properties, which could be confirmed from the change of morphology of grains. Furthermore, the Li2Mg3Ti(O0.96F0.08)6 ceramics calcined at 700 °C and sintered at 950 °C for 6 h exhibited the excellent microwave dielectric properties of ɛr∼14.57, Q × f∼92,450 GHz and τƒ∼-32.91 ppm/°C.
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