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The Li Mg Zr O samples were prepared with the pure cubic phase at sintering temperatures of 1300-1550 °C using the traditional solid state 6 7 3 16 method in our previous work. Sintering characteristics and microwave properties were investigated as a function of sintering temperatures. The samples sintered at 1500 °C showed the best properties of the Q•f value of 81,284 GHz (at 8.94 GHz), dielectric constant value of 14.22 and the τ value of-21.56 ppm/°C. Now complex permittivity value of Li Mg Zr O ceramic sintered at 1500 °C were characterized by the infrared f 6 7 3 16 spectra based on the classical harmonic oscillator model. In order to reduce the sintering temperature, lithium fluoride were used as sintering additives, and then the apparent densities, phase compositions and dielectric properties of Li Mg Zr Ox (0 wt% LiF ≤ x ≤ 5 wt% LiF) were 6 7 3 16 discussed as a function of lithium fluoride additions. As a result the densification temperatures for Li Mg Zr O-5 wt% LiF were reduced to be 6 7 3 16 1100 °C, which were significantly lower than that of the matrix (1500 °C). Excellent microwave dielectric properties were obtained in