Ultralow-fired Li2Mg3TiO6-Ca0.8Sr0.2TiO3 composite ceramics with temperature stable at microwave frequency

New temperature stable 4 wt% LiF-doped (1-x)Li2Mg3TiO6-xCa(0.8)Sr(0.2)TiO(3) (LMT-CST, x = 0.10, 0.15, 0.20, 0.25) composite ceramics were fabricated by solid-state reaction for developing ultra-low temperature (<= 800 degrees C) sintering microwave dielectric ceramics. Sintering temperatures of LMT-CST ceramics were successfully lowered to 725 degrees C due to LiF liquid-phase sintering and well-densified microstructures were obtained at 800 degrees C. Excellent microwave dielectric properties of epsilon(r) = 18.8, Q x f = 48200 GHz (at 8.2 GHz), tau(f) = 0.3 ppm/degrees C was obtained at 800 degrees C for 0.8 LMT-0.2CST-4wt% LiF ceramics. Such sample was compatible with Ag electrodes, which suggests suitability of the developed material for LTCC applications. (C) 2017 Elsevier B.V. All rights reserved.