LiF has been widely applied as an e

LiF has been widely applied as an effective sintering additive or flux in many ceramic formulations but it was not until 2019 that Lei et al. first reported the synthesis of LiF ceramics via conventional sintering and their microwave dielectric properties, εᵣ = 8.02, Qf = 73,880 GHz, and τf =−117.7 ppm/◦C [12]. However, Geyer et al. reported a much higher Qf value (192,400 GHz) for LiF single crystals [13]. According to Lei et al., the disparity in Qf with single crystal arises mainly from the difficulty in densifying LiF ceramics which remain porous after conventional sintering [12].