Microwave dielectric properties of low-fired Li2MnO3 ceramics co-doped with LiF–TiO2

Abstract Li 2 MnO 3 ceramics co-doped with 2 wt% LiF and x wt% TiO 2 ( x =0, 3, 5, 7, 10) were prepared by solid-state reaction for low-temperature co-fired ceramics (LTCC) applications. The sintering temperatures of Li 2 MnO 3 ceramics were successfully lowered to 925°C due to the formation of a LiF liquid phase. Their temperature stability was improved by doping with TiO 2 . A typical Li 2 MnO 3 -2 wt% LiF-5 wt% TiO 2 sample with well-densified microstructures displayed optimum dielectric properties ( e r =13.8, Q × f = 23,270 GHz, τ f =1.2 ppm/°C). Such sample was compatible with Ag electrodes, which suggests suitability of the developed material for LTCC applications in wireless communication systems.